Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a1dfe671f83d03e…

MALICIOUS

PDF

147.6 KB Created: 2020-09-30 13:52:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-31
MD5: 6960af2e43a68c5c570f30cf0552fea3 SHA-1: 6c6a5bb87310e7770205d7894db9549fc6367e51 SHA-256: 5a1dfe671f83d03ee766ac8685a1bd43a3c2df2d7dcc275db39da76b7d475433
164 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://cctraff.ru/strik?keyword=molecular+cell+biology+notes+pdf In PDF document text
    • https://site-1036799.mozfiles.com/files/1036799/kagizo.pdfIn PDF document text
    • https://site-1038946.mozfiles.com/files/1038946/47354813655.pdfIn PDF document text
    • https://site-1036729.mozfiles.com/files/1036729/41400785516.pdfIn PDF document text
    • https://site-1036724.mozfiles.com/files/1036724/44162853194.pdfIn PDF document text
    • http://files.fullyfusedcrafts.co.uk/uploads/1/3/1/8/131857304/gapuvawuxedutu.pdfIn PDF document text
    • http://dotaderop.burnetcountyhighlandlakesmastergardener.org/uploads/1/3/1/3/131398507/7763959.pdfIn PDF document text
    • http://files.puppetstringnews.com/uploads/1/3/1/8/131872269/disisusarobitej-notemakog-wufakafuxasav-nukazer.pdfIn PDF document text
    • http://files.rorosglassartandcrystalskulls.com/uploads/1/3/0/7/130775260/maxulalemetiliko.pdfIn PDF document text
    • http://files.vancouvervolleyballleague.com/uploads/1/3/0/8/130873801/1c2c394e6201113.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee2a70ff-862b-441c-9ac7-9f8da12dc80a/xebenedajibupanosef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffc08c73-bde3-41f4-b387-1a224312fffd/jizonarakubujibuga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/982f13a8-76c7-418b-9aa1-f205fe3d7f4c/3225779679.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b77cb024-603f-4f32-9ed0-217a11a3a26c/46947259766.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d4f998f-5962-4040-bd42-38cbd4f71735/teviwuxugiwuzexidojibew.pdfIn 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_off0001fce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FCE4 5568 bytes
SHA-256: 1621db9a5b3421910d0a1731aff99348a0a698daaf1710c4a2c8c7a9671bd2e8
font_01_sfnt_off00020ff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20FF2 15672 bytes
SHA-256: e9c7616b685fdb2c00a183e3220087b9d8207cc29f3160ffda653f14785142b3

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