It depends, are you running arbitrage on the viral news site? (as a lot of people do lately). Some networks are not ok with arbitrage. Which is why its important to know if you are buying inventory to resell.
Most of viral websites use native ad networks like Taboola/Outbrain. We have a lot of publishers that makes a good revenue by placing our popunder ads as an additional monetization layer. Here is the case study with examples http://media.propellerads.com/make-more-money-with-viral-websites/
Thanks! This is one of our delivery domains for banner ads. At this moment it's absolutely clean https://www.virustotal.com/en/url/0bad44d058d8b73afe47036f9e121b116c453e98c63f8b40068da382dbf98d87/analysis/