Malicious PDF — malware analysis report

Static analysis result for SHA-256 8391b0e68a553060…

MALICIOUS

PDF

12.2 KB Created: 2019-04-30 04:22:26 +01:00 Authoring application: mPDF 5.7
MD5: f8abbdc8e13b6ffb9ae8a1d3ab32b8d2 SHA-1: 3b7c355e845dc23905e07dd2ab3f0fe849fee6fa SHA-256: 8391b0e68a553060c9ecce249fb753c30a4d8729bafea1636f60931e1c11fcc7
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains a large number of embedded links, presented as book titles, which is indicative of a link farm designed to trick users into downloading potentially malicious files. The ML classifier also flagged this PDF as malicious. While no scripts were directly extracted, the PDF structure itself facilitates the attack by hosting numerous external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8737

Heuristics 3

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.com/2a07a04a09a05a07/The-Innocent-Man-by-John-Grisham.pdf
    • http://muicuiu.dumb1.com/3a02a05a02a05a02/Sycamore-Row-by-John-Grisham.pdf
    • http://muicuiu.dumb1.com/2a04a01a08/The-Tumor-by-John-Grisham.pdf
    • http://muicuiu.dumb1.com/4a00a03a03a06a06/The-Client-by-John-Grisham.pdf
    • http://muicuiu.dumb1.com/4a00a04a07a00a05/The-Firm-by-John-Grisham.pdf
    • http://muicuiu.dumb1.com/2a06a01a00a03a01/Calico-Joe-by-John-Grisham.pdf
    • http://muicuiu.dumb1.com/3a00a04a00a03a09/Calico-Joe-by-John-Grisham.pdf
    • http://muicuiu.dumb1.com/4a09a09a01a02a03/The-Partner-by-John-Grisham.pdf
    • http://muicuiu.dumb1.com/4a09a00a04a01a03/The-Pelican-Brief-by-John-Grisham.pdf
    • http://muicuiu.dumb1.com/1a09a03a09a06a08/The-Partner-by-John-Grisham.pdf
    • http://muicuiu.dumb1.com/2a09a06a04a07a08/The-Firm-by-John-Grisham.pdf
    • http://muicuiu.dumb1.com/3a08a08a07a00/The-Brethren-by-John-Grisham.pdf
    • http://muicuiu.dumb1.com/6a00a08a05a00a00/The-Client-by-John-Grisham.pdf
    • http://muicuiu.dumb1.com/3a03a05a09a01/The-Testament-by-John-Grisham.pdf
    • http://muicuiu.dumb1.com/4a06a01a06a09a09/The-Chamber-by-John-Grisham.pdf
    • http://muicuiu.dumb1.com/3a04a06a02a07/The-Broker-by-John-Grisham.pdf
    • http://muicuiu.dumb1.com/3a04a07a02a08a03/Sycamore-Row-by-John-Grisham.pdf
    • http://muicuiu.dumb1.com/4a00a07a08a07/The-Summons-by-John-Grisham.pdf
    • http://muicuiu.dumb1.com/5a00a05a00a05a04/Sycamore-Row-by-John-Grisham.pdf
    • http://muicuiu.dumb1.com/7a07a06a04a09a05/The-Pelican-Brief-by-John-Grisham.pdf

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