It refers to a redirect mechanism implemented within a webpage using JavaScript code instead of standard HTTP response headers. Once the script executes, the visitor is automatically redirected to another URL or domain, often without any visible interaction.
Three questions every analyst asks before acting on this signal.
It refers to a redirect mechanism implemented within a webpage using JavaScript code instead of standard HTTP response headers. Once the script executes, the visitor is automatically redirected to another URL or domain, often without any visible interaction.
Because it is commonly used by threat actors to hide the final destination of a redirect chain, evade URL filtering systems, or deliver malicious payloads selectively. Such redirects are frequently found in phishing kits, malvertising, and exploit delivery frameworks.
No. Some websites use JavaScript redirects for legitimate reasons, such as localization or session tracking. However, unexpected or hidden redirects should raise suspicion, especially when found on compromised or newly registered domains.
A realistic shape of the entry the engine appends to the risk_signals array when this signal fires. Evidence keys are subgroup-default; per-signal overrides documented in the API reference.
{
"slug": "redirect_via_javascript",
"name": "JavaScript-based Redirect",
"group": "http_crawling_history",
"subgroup": "web_behavior_structure",
"direction": "malicious",
"evidence": {
"url_shortener_chain": false,
"auto_refresh_seconds": null,
"direct_ip_link": false,
"browser_interaction_required": true
}
}7 other signals share the same subgroup. They detect related behaviors and often co-fire on the same IOC.
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