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Was Etherdelta hacked? The answer is yes, kinda. The official site itself is fine, as are your wallets (although you probably shouldn't hodl in any exchange). Their DNS server has been compromised, and the hacker(s) have already stolen over 300 Eth so far. It essentially takes you to a fake exchange that looks similar (you can tell it's fake because it won't have chat or Twitter feed).
It is probably best not to use Etherdelta at all until further notice from them. But your coins and private keys should be safe. In the immortal words of The Hitchhiker's Guide to the Galaxy, "Don't Panic".
My apologies to anyone to whom this isn't news.
Official Twitter:
https://twitter.com/etherdelta/status/943582597459972101
- etherdelta
Hacker's wallet: https://etherscan.io/address/0x3f8a37bde9b15b65c82f9cdd00192e0ba36cc5fc