Can you recall what did you do with your Bitfinex account? because why in the hell did it goes to a wrong person and did you contact Bitfinex support already? did you messed up for yourself?
Nope, not a bitfinex issue at all. As I mentioned in the OP it looks like this addy has been compromised for quite sometime as seemingly all previous tx's have behaved in exactly the same way. I believe the source of the problem is either:
a.) a compromised private key for that specific addy
or
b.) the laptop that had full core running on it has been compromised by an unauthorized usb stick being plugged into it :/
Hard to believe I ended up having to screw up with over $3400+ in BTC before I noticed it. In total, 1.45602349 BTC has been lost to this compromised addy.