Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b83a8bde689f521…

MALICIOUS

PDF

35.2 KB Created: 2020-09-17 03:19:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: cf1699780763e3ba61fe6f9fe763930a SHA-1: e375133eed465c7c6bcc8ca7b3fc57f0d5071aec SHA-256: 6b83a8bde689f5212d373119a6e80bc408e9bd552f8b29cf1be06420d9d427dc
184 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to disposable domains, indicating a link farm designed to redirect users to malicious content. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the embedded links are the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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 https://ttraff.club/wix?keyword=reader%2527s+digest+music+books+pdf In PDF document text
    • http://katus.deliverydoula.com/uploads/1/3/1/3/131383483/gazurebafel-gowujiremezogo.pdfIn PDF document text
    • http://files.nuttyhistory.com/uploads/1/3/0/7/130738637/1067038.pdfIn PDF document text
    • http://rimexeput.almosthomecare.com/uploads/1/3/2/7/132741066/rawutenofuvowag-xojuxed-zobekawogaju-duxokulipix.pdfIn PDF document text
    • http://sazixudel.derwenttrees.com/uploads/1/3/1/1/131164462/gapuzikif.pdfIn PDF document text
    • http://tekudiwak.idahobluegrassassociation.org/uploads/1/3/2/6/132695517/popuvekot.pdfIn PDF document text
    • http://files.lneconstruction.com/uploads/1/3/2/6/132681368/008b7e8f69cf.pdfIn PDF document text
    • http://turuxob.mgss.com/uploads/1/3/0/7/130739344/dabagadogifovodip.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4af72dcd-994d-445d-97c0-e8c823f0f3e5.filesusr.com/ugd/f2c1dc_2de9953324af4914a4665156502ee51d.pdf?index=trueIn PDF document text
    • https://8e04d384-1c71-4eef-9c80-f24cd143a50e.filesusr.com/ugd/238140_29984eb4384748b6b5764ae31f81bb0c.pdf?index=trueIn PDF document text
    • https://6384adf7-2cd7-46df-9afb-a79356f838dd.filesusr.com/ugd/2994dd_7cd72d3f3bf241f1af0ef3478f9dd72b.pdf?index=trueIn PDF document text
    • https://3d4e58da-5e0d-474d-83f3-1286cfee71a1.filesusr.com/ugd/e3ff21_6e8b2b8a73a141aa8ada06e039d69eb0.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004ae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4AE7 5688 bytes
SHA-256: 8d801b91318ee6ca6256c25fb2f5435f359db8be167d897646e0a2b6092112aa
font_01_sfnt_off00005e46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E46 9968 bytes
SHA-256: 4ff42736058f823c9f07afaca17abc465c4ff393d37041dec0e307f792a18438

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