Suspicious Redirects: Detecting Malicious URL Chains

What Are Suspicious Redirects?

A suspicious redirect occurs when visiting one URL automatically sends users to another—potentially malicious—destination. Attackers use redirect chains to disguise the true destination of links, bypass security filters, and make phishing attacks more convincing.

For Shopify merchants, redirect-based attacks can:

• Send customers to fake checkout pages
• Disguise phishing links in marketing emails
• Exploit trust in your domain to deliver malware
• Damage your brand reputation when customers realize they’ve been tricked

How Redirect Attacks Work

Simple Redirect

yourstore.com → phishing-site.com

Easy to detect—most security tools catch direct redirects to known bad domains.

Redirect Chain

yourstore.com → tracking-service.com → shorturl.cc → phishing-site.com

Harder to detect—each hop may look legitimate individually, but the chain leads to danger.

Open Redirect Exploitation

If your site has an open redirect vulnerability:

yourstore.com/redirect?url=https://evil-site.com

Attackers can create links that start on your trusted domain but end anywhere. Your customers see your domain and trust the link.

Common Redirect Attack Scenarios

Fake Order Tracking

Scammers send emails with tracking links:

"Track your order: yourstore.com/track?id=12345&redirect=phishing-site.com"

The link starts at your domain, gaining customer trust, then redirects to a credential-stealing page.

Compromised Marketing Links

Attackers target URL shorteners and tracking services used in your marketing:

1. Your email contains: link.yourstore.com/promo
2. Attacker compromises the shortener or intercepts DNS
3. Link now redirects to a fake site

SEO Spam Injection

Attackers inject hidden redirects into your site:

• Normal visitors see your regular site
• Search engine bots see spam/malware redirects
• Google flags your site as dangerous

Affiliate Link Hijacking

Attackers modify your affiliate or referral links to:

• Steal commission by replacing affiliate IDs
• Redirect to competitor sites
• Inject malware download pages

Signs Your Store Has Redirect Issues

Warning Sign	What It Means
Google Search Console warnings	Google detected malicious redirects
Unexpected traffic drops	Users bouncing due to redirect warnings
Customer complaints about strange links	Phishing using your domain
Browser warnings on your site	Security tools detecting redirect chains
Unusual referral traffic patterns	Redirect exploitation in progress

Open Redirect Vulnerabilities

An open redirect is a security flaw where your site redirects to any URL specified in a parameter without validation.

Vulnerable Code Example

# DANGEROUS - accepts any URL
/redirect?url=https://evil-site.com

Secure Implementation

# SAFE - only allows whitelisted destinations
/redirect?destination=order-status

Why Open Redirects Are Dangerous

1. Borrowed trust: Attackers use your trusted domain to make the destination look safer
2. OAuth token theft: Intercept authentication flows
3. Malware delivery: Bypass email and browser filters
4. SEO penalties: Google may flag your entire site

Shopify and Redirects

Built-in Redirect Features

Shopify provides legitimate redirect functionality:

• URL redirects in Settings > Navigation
• Automatic HTTPS redirects (HTTP → HTTPS)
• Domain redirects for connected domains

These are safe and managed by Shopify.

Third-Party App Risks

Shopify apps that create redirects can introduce vulnerabilities:

• URL shorteners: May be compromised or abused
• Tracking pixels: Redirect chains for analytics
• Affiliate tools: Parameter-based redirects

Audit apps that modify URLs or create tracking links.

Theme Code Risks

Custom theme code might include redirect logic:

// DANGEROUS - redirects based on URL parameter
const target = new URLSearchParams(window.location.search).get('goto');
if (target) window.location = target;

Never redirect based on user-controlled input without validation.

How Recon Detects Suspicious Redirects

Recon monitors your domains for redirect issues:

Check	What We Detect
Redirect chain analysis	Multi-hop redirects to suspicious destinations
Final destination verification	Whether redirect chains end at safe sites
Known malware endpoints	Redirects to flagged domains
Unusual redirect patterns	Sudden changes in redirect behavior

Issue Severity

Finding	Severity	Description
Redirect to malicious site	Critical	Direct redirect to known-bad domain
Suspicious redirect chain	High	Multiple hops through questionable sites
Open redirect vulnerability	High	Your domain can redirect anywhere
Redirect to unverified site	Medium	Destination isn’t clearly safe or dangerous

Fixing Redirect Problems

If Your Site Is Redirecting Maliciously

1. Check for malware: Scan your theme code for injected scripts
2. Review apps: Disable recently added apps
3. Check DNS records: Ensure records haven’t been modified
4. Review Shopify redirects: Settings > Navigation > URL Redirects
5. Contact Shopify support if you can’t identify the source

If Your Domain Is Used in Phishing

1. Report the phishing site to Google Safe Browsing
2. Warn customers through official channels
3. Monitor for open redirect exploitation on your site
4. Document and report to relevant registrars

Preventing Open Redirects

1. Use allowlists: Only redirect to pre-approved URLs
2. Use mapping tokens: redirect?to=order-status instead of full URLs
3. Validate destinations: Check against trusted domain list
4. Add warning pages: “You’re leaving our site” interstitials

How Recon Helps

Recon protects your Shopify store by:

• Continuously monitoring your domain’s redirect behavior
• Alerting you when redirects point to suspicious destinations
• Detecting changes that might indicate compromise
• Identifying open redirect vulnerabilities
• Checking redirect chains, not just immediate destinations

FAQ

Q: How do I know if my store has an open redirect?

A: Try adding ?redirect=https://google.com to various URLs on your site. If any page redirects to Google, you may have an open redirect. Recon scans for these vulnerabilities automatically.

Q: Can Shopify apps create redirect vulnerabilities?

A: Yes. Apps that create tracking links, URL shorteners, or affiliate systems can introduce redirect risks. Review app permissions and monitor for unusual redirect behavior.

Q: What if Google flagged my site for malicious redirects?

A: Check Google Search Console for specific warnings. Clean the malware, then submit your site for review. The flagging typically lifts within a few days after the issue is resolved.

Q: Are Shopify’s built-in redirects safe?

A: Yes. Redirects created through Shopify’s URL Redirects feature (Settings > Navigation) are safe and don’t create open redirect vulnerabilities.

Q: How quickly should I respond to redirect warnings?

A: Immediately. Malicious redirects can compromise customer data, damage your reputation, and result in Google penalties. Treat redirect warnings as critical security incidents.

OWASP Classification

Unvalidated redirects are classified under OWASP A01:2021 Broken Access Control. They’re a well-documented vulnerability category with established prevention techniques.

For technical details, see the OWASP Unvalidated Redirects Cheat Sheet.