Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a208ce4522b7ff0…

MALICIOUS

PDF

47.5 KB Created: 2020-04-21 21:21:58 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 9f2be2b825c65d6ebf8bfb4c5fc2b9b4 SHA-1: 8fc1ce790f9563121cd444ac064026c0e009b673 SHA-256: 3a208ce4522b7ff01803e9d5b2abe971d886978e592610d46af47f0cd6204222
92 Risk Score

Malware Insights

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

The PDF file contains numerous external links to various domains, a common technique for SEO spam or phishing. The heuristic PDF_SEO_LINK_FARM specifically identifies this pattern, indicating a large number of external PDF links generated for SEO purposes. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, and the document body is heavily obfuscated, but the presence of multiple suspicious URLs points to a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://cfirthwssu.com/uploads/1/3/0/6/130605216/130605216.html#acrylic+plastic+sheet+cost
    • http://trumperycraft.com/uploads/1/3/1/6/131607346/671e7d0e.pdf
    • http://tgillikinphotography.com/uploads/1/3/0/2/130271116/32c4fe3ec19.pdf
    • http://bolksteinanderson.com/uploads/1/3/0/6/130620267/6246208.pdf
    • http://www.mekafarm.com/uploads/1/3/0/8/130813841/mojabozewe.pdf
    • http://iliketomakethings.ca/uploads/1/3/1/3/131381806/8575590.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_off000084ae.bin
1726dc042e9a5b9f26ce615d21c6797e6691c734f0aaed33fda290a6526bb08c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84AE 9128 bytes
font_01_sfnt_off0000a758.bin
d907c570f1f8f2d62f38d7529dbf77de46ca3a1917ec53aca7a78bae59874b04		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA758 2616 bytes

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