Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4a36f6c7ff2c486…

MALICIOUS

PDF

96.9 KB Created: 2020-06-23 10:06:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e78df0ba4865d1eb84ca01ad60d7b6c2 SHA-1: f5e42a0080d7c1cf0b809c18a363fd2f60768c9d SHA-256: c4a36f6c7ff2c486d659b93358e6a5cd35cf7f65993b5368a101332f922a4614
96 Risk Score

Malware Insights

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

The PDF contains a lure text 'Wow bc leveling guide' and embeds numerous external links, many of which point to similarly structured URLs on different domains. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links designed to manipulate search engine results or distribute content. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves directing users to external websites via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://kate-bishop.pleasingfood.com/uploads/1/3/0/6/130621284/130621284.html#wow+bc+leveling+guide
    • http://hansnestingen.com/uploads/1/3/0/5/130546153/gelubudubuxe.pdf
    • http://montereybaysucculents.com/uploads/1/3/0/6/130604493/9730928.pdf
    • http://mycarecounseling.org/uploads/1/3/0/6/130639658/6771303.pdf
    • http://finchleather.uk/uploads/1/3/0/7/130740316/tinumod.pdf
    • http://fullmoonstoneco.com/uploads/1/3/1/4/131453194/3131774675.pdf
    • http://mail12.sheng.studio/uploads/1/3/0/9/130969355/jatema.pdf
    • http://action-appliance-installation.net/uploads/1/3/1/4/131452823/jarugexugiloner_didivuku.pdf
    • http://sunviewhills.com/uploads/1/3/0/8/130874153/82efec480.pdf
    • http://evokedanceeistedfodd.com/uploads/1/3/0/6/130604013/9f820e3.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_off0001414c.bin
6f8beb146bfd7c411cb403721b22f5a21bcb58fdc849fc51910b8f663c7b51f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1414C 4728 bytes
font_01_sfnt_off0001517d.bin
d588216c31e1e7ad57e56494a5facea643c71d03b9628d9f53cb62944be0a195		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1517D 11064 bytes

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