Hey everyone,
My team and I have been digging into this problem and can't find an answer - and it turns out this has been an issue for over year. I'll try to explain the best I can, but let me know if you have any questions.
My predecessor noticed a non-existent page URL getting traffic in GA. He had the web dev team create a page so he could see where the traffic is coming from. The page has every directive under the sun on it; noindex, nofollow, noarchive, nosnippet, noodp, noydir, noimageindex, notranslate
All of the traffic is (direct) / (none). It gets about 300 visits per day. Avg. time on page is 15:40, bounce rate is 99.6% and it doesn't show up in the funnel. Previous page path is 92% entrance; 8% homepage. Geo is 92% US; then diversified across countries. Browser is predominately Chrome. OS is only Windows, and device is only desktop.
I've run this page through a backlink checker, and we get nothing. I've run it through Screaming Frog and it has no internal links pointing to it. I've tried putting quotes around the URL and googling it and we get a few websites, but they're very low authority and it isn't likely that they're sending 300+ visits per day. Also, since all of the traffic is direct, I don't think it's coming from a backlink anyway.
This has become a personal quest for several of us, as we really want to figure out where that traffic is coming from. Any thoughts? What am I missing? It's kind of driving me crazy because I can't figure out what I've missed, so if anyone figures this out and is coming to Pubcon in November, I'll buy you a beer!! 
