this morning I saw these fraudulent youtube videos.
I never thought on this kind of "spam" technique. While the user is watching his favorite music video an advertisement's pop-up comes in the monitor saying: "to see more about your favorite singer click here". The user, especially during the first attacks, is tempted to click on - or copy and paste the fraudulent link which might point to whatever malicious site.
Here another example ..
If you wanna try by yourself, the youtube search words are:
Adam Lambert AMA kiss
Ortiz vs. Griffin