Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3ee1748928f5698…

MALICIOUS

PDF

45.7 KB Created: 2020-05-08 21:53:30 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d949335405e6f4024a14e773022c7639 SHA-1: 16779c39c089819df5842887beb8f721c1d10188 SHA-256: c3ee1748928f56980d297588f03bc190646ae9134b4cada89618adc723ba3f6e
94 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection tactic. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the sheer volume of suspicious URLs points towards a content-luring or SEO manipulation attack pattern. The document body text is heavily obfuscated and contains fragments of URLs, reinforcing the link-based attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 4

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://tcsonline.net/uploads/1/3/0/5/130551331/130551331.html#chrome+plugins+adobe+flash+player
    • http://livoniabanquets.com/uploads/1/3/0/3/130323377/5766033.pdf
    • http://aishascloset.com/uploads/1/3/0/3/130313140/c28672566b63db9.pdf
    • http://thebigskygypsy.com/uploads/1/3/1/3/131380008/9571756.pdf
    • http://texasbusinessreviews.com/uploads/1/3/1/4/131453595/nuforuji.pdf
    • http://nationaltemple.org/uploads/1/3/1/4/131455398/9947344.pdf
    • http://gcconsulting.biz/uploads/1/3/0/7/130775009/pukexaguzijin.pdf
    • http://carlaebeling.com/uploads/1/3/0/7/130740158/61bac.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006762.bin
af411e4d7ffb4166296dc2cf4f636bef4573af66c71c6f779276487836f8c433		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6762 1736 bytes
font_01_sfnt_off00006fe5.bin
a0f001480187fc0bd0e4d82e7ca0fac8c0ee23a0f87f5ebf9190c4dc5d60d810		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FE5 11800 bytes
font_02_sfnt_off000096f9.bin
036c3bd3be627dd3e85e3b039329017ca2931a54c30fe10e758a8bc8a07482c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96F9 16296 bytes

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