PuSHeD and Encephalon both add to logic-linked skill tests (they can both be found in Augmentation) which is where the skills come from.
Logic doesn't directly help hackers, however, it does have a kind of roundabout synergy. Hackers want Logic-linked skill boosters (PuSHeD, Encephalon, possibly NeoCortical Nanites) to be good at the hacking skills. This also means that they get a bonus to other logic-linked skills like First Aid, Hardware, and a lot of the build/repair skills that are quite useful. So it often does make sense for a hacker to spend some points having a good logic and those skills so that they can get good use out of the bonuses they wanted anyways. If you just care about hacking and nothing else, Logic doesn't help, of course, if you just care about hacking and nothing else, you should be a technomancer, not a hacker.