The [link](https://www.win.tue.nl/~aeb/linux/hh/hh-11.html) the hint provides us sort of leads us on the right track, but the program's malloc in this challenge is slightly different. Just following the tutorial's ideas will not work. I used it as my basis and found the differences in the way malloc behaves with gdb. Then, you can use shellcode to jump to the win function.

Original writeup (https://www.willsroot.io/2019/10/picoctf-2019-afterlife-secondlife-and.html).