Redirections are other common way of fooling the site visitors and serving them malicious or spam content.
Very often, these redirections are done only under specific conditions such as browser type or the visitor "type" (e.g. human vs. bot).
In blackhat SEO most redirects target visitors coming from search results. This way spammer may promote doorways on a hacked site but
when search click on results that lead to that site, they end up on a completely different site - the real beneficiary of the blacklhat SEO campaign
Affecting
Any website
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Dump
This code snippet redirects the visitor based on the User-Agent condition:
if(navigator.userAgent.match(/^1207.*|^3gso.*|^4thp.*|^501i.*|...|^ZTE.*/i))
{ window.location = "http://----.--/6vO910" };