Well, this is something clever! Tactics is to use some legitimate site (a search engine) to point you to a malicious site, thus playing on your trust. Moreover, using legitimate site that is often visited makes the attack more efficient. This is not something completely new. See Spammers feeling lucky with Google, for example.
Read ComputerWorld article:
http://www.computerworld.com/action/article.do?command=viewArticleBasic&articleId=9049269&intsrc=news_ts_head
Subverted search sites lead to massive malware attack in progress
Subverted search sites lead to massive malware attack in progress
