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There are enough laws in most places thoroughly covering these kinds of activities that you can safely assume it’s breaking at least some law in some jurisdiction.

And even if you wouldn’t be in the jurisdiction that prohibits it and/or wouldn’t be extradited for it, that doesn’t technically make it legal.

Most laws don't care about the nationality of the victim - i.e. in a legal sense yes it is illegal. Whether or not the governments would work together to extradite/charge you, on the other hand, is a different story.

Usually if $SOMETHING is a crime in both countries, you can get extradited easily.

If $SOMETHING is not a crime in one of the countries you can be liable for damages only, buy I am not sure if this is sufficient to be extradited.

Most likely your home country has laws against hacking. A foreign entity propaply can sue you in your home.