Malicious PDF — malware analysis report

Static analysis result for SHA-256 bed0ff0d02d10c6c…

MALICIOUS

PDF

37.8 KB Created: 2020-04-04 08:49:00 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c2f24f929aa4fc953ca92103e1ce3a29 SHA-1: 678ff8ba1d2b3ca99447b20fbe4509aaa8f085ac SHA-256: bed0ff0d02d10c6cff316aa07614cdd2eaae431ec8325d62b3d01ac5cba8ecb5
92 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to PDF files with numeric slugs on various domains. This pattern is indicative of a link farm, often used for SEO poisoning or to distribute malicious payloads. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, and the document body was heavily obfuscated, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://sensitiveminds.org/uploads/1/3/0/6/130639161/130639161.html#cash+flow+statement+report+in+sap+tcode
    • http://amandamusick.com/uploads/1/3/0/7/130776149/2177056.pdf
    • http://kchungphotography.com/uploads/1/3/0/2/130291523/nuzukife.pdf
    • http://kasleroutdoors.com/uploads/1/3/1/4/131407705/8869753.pdf
    • http://chinoxx.com/uploads/1/3/0/8/130813852/tixuzidatefipuf_vadaxofarux_podejawupa_poparus.pdf
    • http://evokefitness.net/uploads/1/3/1/3/131381518/xinokugirutekokuxolu.pdf
    • http://jimjturner.com/uploads/1/3/0/2/130272631/polusepel_nitokesapata_mapuxejonolu.pdf
    • http://laurazimmerman.com/uploads/1/3/0/7/130776415/xutedefovejik-gitogopezoz-xorivi-penedi.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_off00006205.bin
32e01dcd74527f42d19b629b4843a2e03b5606b8c9a1c8839d730e50d1272840		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6205 8256 bytes
font_01_sfnt_off000081dd.bin
83459e82cebe561b9e65dda6a09953c9e35f75e5df0fa62a624e1833cc5b8086		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81DD 1708 bytes

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