Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa54b1922444edbd…

MALICIOUS

PDF

47.7 KB Created: 2020-04-03 15:23:41 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e7f16c718b848b2f7df0920778759f7a SHA-1: d7ea356f4e31132a7e88957b7ad137f3ba9b9b72 SHA-256: fa54b1922444edbdb9cc23c9e838423b63e11ff2edc8e7dca929db175a7426b6
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links to various domains, suggesting a link farm or SEO poisoning attack. The ML classifier strongly indicated maliciousness. The document body, though partially corrupted, contains a URL that points to a path with a game item name, potentially a lure. The primary attack pattern involves directing users to a network of SEO-optimized PDF files.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://lennoxweb.com/uploads/1/3/0/2/130288329/130288329.html#bracers+of+blinding+strike+pathfinder
    • http://blissfulbunsowensound.com/uploads/1/3/0/5/130550796/7818496.pdf
    • http://audreyandsandra.com/uploads/1/3/0/9/130969862/3564191.pdf
    • http://dentalsmilesunlimited.net/uploads/1/3/0/2/130287257/feferoli.pdf
    • http://pneumaticpartscompany.com/uploads/1/3/0/7/130740195/af98654f18.pdf
    • http://sweetsaguaro.com/uploads/1/3/0/7/130739204/wupafolomoxoxutulale.pdf
    • http://bottom-linebookkeeping.com/uploads/1/3/1/4/131453062/9124805.pdf
    • http://viperfisharts.com/uploads/1/3/1/3/131380885/kojubisubusego-didovama-jagaxamoro.pdf
    • http://emandabfloraldesign.com/uploads/1/3/0/6/130639827/5984838.pdf
    • http://jewelrybyjimpluhar.com/uploads/1/3/1/3/131382797/fewojo.pdf
    • http://mermaidexplorers.com/uploads/1/3/0/6/130621298/420ee4690c3d7d.pdf
    • http://inspiringteamdevelopmentandawaydays.com/uploads/1/3/0/9/130969795/7a52ffa.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_off00007cc0.bin
c9e90e3fc7fb88485f11ccb5e1ee6cc18483a4627d9adf35bc6210cb9328e122		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CC0 8380 bytes
font_01_sfnt_off00009cfe.bin
b3affdfdfee497c2d3230853582529cf395d265bfdbb8cde7d84ae9c33602211		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9CFE 16036 bytes

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