MetaMask wallet suddenly completely empty

So I've been slowly DCA'ing the past couple of years and to my surprise I see a lovely transaction to another unknown wallet that completely drained my balance of ETH. While it isn't much I stacked up so far, I'm more curious on how this could've happened. I have a background in IT so I've been careful with my data, I've never shared the seed or the private key. I haven't even used the private key afaik which makes it even a bigger mystery to me on how it could've happened.

I've seen a similar post that had some proper comments of malicious contracts that have been signed and although I can't remember if I ever signed something I shouldn't have, I might miss something completely. And since I lost most of it already, what's the harm in asking some folks that possibly know more about this than I do?

Looking forward to your insights. Cheers!

Link to the address here: https://etherscan.io/address/0xC66C399d5eCA62F236e23875d7A1903Da79b5b1d