Even without malicious intent, many ROM hosting sites are abandoned. The "link" you click might lead to a corrupted split archive or a dead torrent with no seeders, wasting your time and bandwidth.
To obtain this file legally, you must dump it from your own physical cartridge using a dedicated device (such as a Retrode, an N64 flashcart dumper, or specific homebrew methods on a Wii/Wii U). baseromusz64 link
Why would someone need this specific base ROM? Here are the most common scenarios: Even without malicious intent, many ROM hosting sites