The attempt to access this URL indicates a likely attack. The goal of the attacker is to trick the server into querying itself to retrieve sensitive IAM (Identity and Access Management) security credentials. If successful, this allows the attacker to hijack the permissions of the compromised server, potentially leading to full cloud account takeover.
The application can then use these credentials to call AWS APIs (e.g., read from S3, write to DynamoDB, launch new instances). The attempt to access this URL indicates a likely attack
If a web application on the instance makes HTTP requests based on user input (e.g., fetch(user_provided_url) ), an attacker can supply http://169.254.169.254/latest/meta-data/iam/security-credentials/ and steal the instance’s IAM keys. read from S3