Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4480dd6d29fb99b…

MALICIOUS

PDF

33.9 KB Created: 2020-06-21 21:24:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a919ceebe4266b16d210f857b0c7a692 SHA-1: 2506ad05e14eab352ec0697b55d269668169ac10 SHA-256: b4480dd6d29fb99b59ffd17fb36cdb071f57bcb62b9ec4e075068255d9b7b38f
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier as malicious and contains a large number of external links, characteristic of a link farm. The primary purpose appears to be directing users to numerous other PDF files hosted on various domains, likely for SEO manipulation or to distribute further malicious content. No scripts were extracted, and the document body contained obfuscated text and URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://mobulamanta.org/uploads/1/3/0/7/130775969/130775969.html#plasmodium+vivax+pdf
    • http://affinityseize.com/uploads/1/3/1/1/131163737/wibetisoxan.pdf
    • http://mta-sts.mail.catherinehodge.com/uploads/1/3/1/4/131483167/foxupivu.pdf
    • http://christylive.com/uploads/1/3/0/6/130620228/bozipadig.pdf
    • http://420delivered.org/uploads/1/3/0/7/130739656/e6d8f9450e7.pdf
    • http://topknotchfirestopllc.com/uploads/1/3/0/2/130271167/581cca5c4a1aeb.pdf
    • http://freespiritsewingstudio.com/uploads/1/3/1/4/131406658/18bc671e9e.pdf
    • http://thejeffreyamcleanfoundation.org/uploads/1/3/1/1/131164020/vapaku-talola-wepiwo-xevazemo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004a26.bin
7f34823b616eed9bf3685264d7395f79fb66bde6276eaf6630d97d07fdad0ada		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A26 4796 bytes
font_01_sfnt_off00005a79.bin
7ab89df7432f6708379dadd5efa8458465bd6c3a413fe45f96152d27d5a5e6ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A79 9864 bytes

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