The redeem-onchain-sdk npm package is a malicious package impersonating a legitimate Polymarket on-chain SDK. It exfiltrates sensitive data including SSH keys, AWS credentials, npm tokens, Docker authentication, Chrome saved logins, .env files, and git commit history to a command and control server hosted on AWS. The malicious payload activates via a require() side effect in version 1.0.1 and a postinstall hook in version 1.0.5, with the payload located in dist/proxy.js (later renamed dist/index5_test.js).