Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbcffb652127e040…

MALICIOUS

PDF

12.3 KB Created: 2019-04-29 23:01:31 +01:00 Authoring application: mPDF 5.7
MD5: 3ac480d19497792f9eba21c30a67bf0e SHA-1: b35be809117d11c4f1366cc17c0936923d89440b SHA-256: bbcffb652127e040900af7ea3c90fb40e1be94e951d12b36e3bd4c4c733518df
90 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded URLs, identified as a link farm. While the specific intent of these links is unclear due to the 'confirmed_benign' label on some, the sheer volume and the ML classifier's high confidence score suggest a malicious purpose, likely to direct users to external sites for further exploitation or phishing. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8780

Heuristics 2

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://muicuiu.dumb1
    • http://muicuiu.dumb1.com/5a05a03a06a01a09/Wuthering-Heights-by-Emily-Bront-.pdf
    • http://muicuiu.dumb1.com/5a08a01a03a02a05/Wuthering-Heights-by-Emily-Bront-.pdf
    • http://muicuiu.dumb1.com/2a07a00a04a04a06/Wuthering-Heights-by-Emily-Bront-.pdf
    • http://muicuiu.dumb1.com/9a08a06a01a06a00/Wuthering-Heights-by-Emily-Bront-.pdf
    • http://muicuiu.dumb1.com/9a01a06a02a06a00/Wuthering-Heights-by-Emily-Bront-.pdf
    • http://muicuiu.dumb1.com/6a06a03a05a01a07/Wuthering-Heights-by-Emily-Bront-.pdf
    • http://muicuiu.dumb1.com/5a05a02a02a00a05/Wuthering-Heights-by-Emily-Bront-.pdf
    • http://muicuiu.dumb1.com/1a00a07a05a01a04a00/Wuthering-Heights-by-Emily-Bront-.pdf
    • http://muicuiu.dumb1.com/7a06a01a03a01a09/Wuthering-Heights-by-Emily-Bront-.pdf
    • http://muicuiu.dumb1.com/4a06a05a03a02a09/Wuthering-Heights-by-Emily-Bront-.pdf
    • http://muicuiu.dumb1.com/7a07a01a03a06a06/Wuthering-Heights-by-Emily-Bront-.pdf
    • http://muicuiu.dumb1.com/2a09a05a06a00a03/Wuthering-Heights-by-Emily-Bront-.pdf
    • http://muicuiu.dumb1.com/9a02a07a00a02a06/Wuthering-Heights-by-Emily-Bront-.pdf
    • http://muicuiu.dumb1.com/2a05a00a07a09a04/Wuthering-Heights-by-Emily-Bront-.pdf
    • http://muicuiu.dumb1.com/1a01a08a03a01a00a07/Wuthering-Heights-by-Emily-Bront-.pdf
    • http://muicuiu.dumb1.com/5a05a04a03a06a05/Wuthering-Heights-by-Emily-Bront-.pdf
    • http://muicuiu.dumb1.com/5a06a08a07a02a04/Wuthering-Heights-by-Emily-Bront-.pdf
    • http://muicuiu.dumb1.com/6a00a00a09a02a04/Wuthering-Heights-by-Emily-Bront-.pdf
    • http://muicuiu.dumb1.com/1a01a09a05a01a01a03/Wuthering-Heights-by-Emily-Bront-.pdf
    • http://muicuiu.dumb1.com/5a08a08a06a04a06/Wuthering-Heights-by-Emily-Bront-.pdf

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