Yes I had the issue either.
I actually assumed it was my browser that had some exploit installed. But after clearing cookies, DNS, etc, it was still going to that site.
If you read their twitter they are confirming
https://twitter.com/etherdeltaHowever what doesn't make sense is why would they hack their DNS and not send to a phishing site instead of showing those ads, doesn't make sense.
Holy snap! That's scary O.o
I'm glad I never liked their site, I found it too confusing and ended up going to Binance. Little more hassle, but I like it.