Malicious PDF — malware analysis report

Static analysis result for SHA-256 af0a6ec970c606cc…

MALICIOUS

PDF

36.3 KB Created: 2020-06-20 21:52:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9aa039cd657a8022c844e397399e10b SHA-1: 1bef3539d518bd85bcab707b4db6e1f2e3e621c7 SHA-256: af0a6ec970c606ccefaf0f95bee2232f6e95b24ba5c253e18d823d514ae2197d
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links to various subdomains, indicative of a link farm or SEO abuse. The ML classifier strongly flagged this PDF as malicious. The primary intent appears to be redirecting users to a network of SEO-optimized PDF files, likely for traffic monetization or to host malicious content.

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://larkinday.com/uploads/1/3/0/9/130969884/130969884.html#article+a+an+the+exercises
    • http://michelleyoung.guru/uploads/1/3/0/7/130738790/xunojufine_vudoz.pdf
    • http://mrobrienteacher.com/uploads/1/3/0/6/130620620/lizifetidolidezari.pdf
    • http://universecollision.com/uploads/1/3/0/3/130379179/1246763.pdf
    • http://katiejbishop.com/uploads/1/3/0/5/130551920/wixamodujanaxot.pdf
    • http://alicialamour.com/uploads/1/3/1/0/131070170/munusotewu_nanotegasuso_monup_lowot.pdf
    • http://sabinescottage.com/uploads/1/3/0/5/130539205/8dd1a256db5d.pdf
    • http://giftgamegimmick.club/uploads/1/3/1/4/131407857/7292755.pdf
    • http://jobsight365.com/uploads/1/3/0/5/130588452/mitader-setuzi-sukapamoduji-pewuduwegedaked.pdf
    • http://digitaladking.com/uploads/1/3/0/4/130476700/6ed27b409.pdf
    • http://healthylifebydanielle.com/uploads/1/3/1/6/131637306/nonineserujul_zosogiviki_zuxupizun.pdf
    • http://nolimitz.net/uploads/1/3/1/6/131606241/mupovufokovize.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_off000052c4.bin
a7a92419f35fea408d22fb6ff5c6de4acd2b761eda784b8028e4b3e7686ee81c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x52C4 4624 bytes
font_01_sfnt_off00006255.bin
fa112aed78f537c71f5bf3119eafca4a5cd2447e4c712aff3fce2a98089b4b9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6255 10196 bytes

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