How can we understand the source pop-up website in Google Analytics?

You know, the pop up hits can be a reason for banning adsense account.

if a website gives you a pop-up ad without your knowledge, your bounce rate will be increase dramatically.

We do not see the pop-up source website in Google analytics. We see that hits as "direct hits".

My question is: How can we find the source of pop-up hits?

from Google Analytics http://ift.tt/1ZEDM7Y
via IFTTT
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