Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d2bf365f5a6b5d9…

MALICIOUS

PDF

31.1 KB Created: 2020-05-13 14:17:16 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 184e4f766746ee71748e9b76d920355d SHA-1: 5e62004dd68f121e48d29de8dae79b0abe557597 SHA-256: 5d2bf365f5a6b5d976111130da88081d5f7de5f9d54869ec2e4b6e7164db262c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous embedded URLs, many of which are part of a link farm designed to appear as quiz answers. The ML classifier strongly indicates maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a large number of external links. The primary attack pattern involves luring users to external sites, likely for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://flcboutique.shop/uploads/1/3/1/4/131453433/131453433.html#history+1301+quiz+1+answers
    • http://troop90scouts.com/uploads/1/3/0/7/130775291/692756.pdf
    • http://designplot.studio/uploads/1/3/0/8/130813453/2030918.pdf
    • http://cheatdaycards.com/uploads/1/3/0/6/130604848/bosafubugoti_nudas_birep.pdf
    • http://powerinmyskin.com/uploads/1/3/1/4/131409616/73e6e45213aa.pdf
    • http://maximilianioan.com/uploads/1/3/0/3/130379317/palaxenuwoxiresive.pdf
    • http://thefudgeboutique.com/uploads/1/3/0/9/130969801/bopixol.pdf
    • http://ampmenergy.com/uploads/1/3/0/6/130604919/fd78bd1b4.pdf
    • http://nyskichick.com/uploads/1/3/0/5/130588207/6057207.pdf
    • http://quickreachtray.com/uploads/1/3/0/2/130291689/fa77fec647dc52.pdf
    • http://cementedintimephotography.ca/uploads/1/3/0/8/130874330/zalumep.pdf
    • http://newbrookschool.org/uploads/1/3/0/2/130289333/4130282.pdf
    • http://understandingcultures.com/uploads/1/3/0/6/130620436/8763966.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004f25.bin
a18345098956b29a04e48597bb68123ba912a8a159fcb8a03211ec4dbf4da380		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F25 10012 bytes

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