Malicious PDF — malware analysis report

Static analysis result for SHA-256 acc4cb20e315bfda…

MALICIOUS

PDF

32.0 KB Created: 2020-04-16 11:49:06 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 206dd7245afff92790b82ce76da10175 SHA-1: 81c3e0cb065fc96acaa60ee52d9552c677487168 SHA-256: acc4cb20e315bfdada277a644fdaf8ea19df35a4b14884eb9aac321155671de1
96 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to other PDF documents hosted on various domains. The 'PDF_SEO_LINK_FARM' heuristic strongly suggests this is an attempt to manipulate search engine results or redirect users to malicious content. The ML classifier also flagged this PDF with high confidence. No scripts were extracted, but the sheer volume of external links indicates a likely redirection or content delivery scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://rnrpaintingco.com/uploads/1/3/0/5/130550952/130550952.html#pixar+intro+blender+file
    • http://climatecontrolstorage.net/uploads/1/3/0/5/130550869/medobojo_nirugijagi_depunevagopukek.pdf
    • http://thecleanexperts.org/uploads/1/3/0/6/130621656/9023472.pdf
    • http://izzydoeeeart.com/uploads/1/3/0/6/130604672/ruwobazoj.pdf
    • http://ergomobile.ca/uploads/1/3/0/3/130313037/xewenexuzi.pdf
    • http://heartfulsoul.com/uploads/1/3/0/8/130814931/musate.pdf
    • http://hakunamatatabyraunaqbana.com/uploads/1/3/0/5/130544746/1634099.pdf
    • http://audienmediasolutions.com/uploads/1/3/1/1/131164504/7a44ca2c4e.pdf
    • http://e-socratos.com/uploads/1/3/0/4/130489536/zejoxipo.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000055cc.bin
a8bd2a1f3daaaf158d9ef0dfab5f6643aa2580dfa2951b81a81e62e5c4f0f1be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x55CC 7820 bytes

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