Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cba432f9fc05624…

MALICIOUS

PDF

74.1 KB Created: 2021-01-21 17:20:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 302db18d470571a2935fe5eded8f2350 SHA-1: e7d9b044405a09acc2b3dc551a1f026f8007e699 SHA-256: 6cba432f9fc056244d60c98853fb9c92d01cb1962d82c62f292cd097b866a6f9
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded links, with several heuristics indicating it functions as a link farm. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting a phishing or malware distribution attempt. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack pattern involves redirecting users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ggtraff.ru/aws?utm_term=canon+ae-+1+manual+aperture In PDF document text
    • https://static.s123-cdn-static.com/uploads/4378165/normal_5ffe012214616.pdfIn PDF document text
    • https://cdn.sqhk.co/wezufunin/cxZLKXd/can_knockdown_3.pdfIn PDF document text
    • https://xemageka.weebly.com/uploads/1/3/1/3/131380316/2224935.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421056/normal_5fa93382b513e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373271/normal_5f9f63e070749.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373998/normal_5fbe80244f7ed.pdfIn PDF document text
    • http://xavelodezazil.iblogger.org/febuzufasifixafuxajuxe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382613/normal_5fbf06351d344.pdfIn PDF document text
    • https://topalezomezo.weebly.com/uploads/1/3/4/3/134305389/a65ce44.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389097/normal_6009077c7c132.pdfIn PDF document text
    • https://diwesosun.weebly.com/uploads/1/3/2/6/132695938/5913042.pdfIn PDF document text
    • https://narefipikabisip.weebly.com/uploads/1/3/2/6/132682930/natowizoliteduforedi.pdfIn PDF document text
    • https://weralafopibobal.weebly.com/uploads/1/3/4/3/134338927/2bd442d315e3.pdfIn PDF document text
    • https://limorevoxa.weebly.com/uploads/1/3/4/6/134611026/suxor-tidovoxo-tilegugit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485580/normal_5fb8c934da278.pdfIn PDF document text
    • https://lagipadule.weebly.com/uploads/1/3/5/3/135301279/9609064.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://puwomuf.rf.gd/jizazaluxumukus.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_off0000e4b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B7 4776 bytes
SHA-256: 71943d148e55a46fcc1090f7d8ffed14c0afff9de3418add9ce631baabe4a7c7
font_01_sfnt_off0000f4e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E7 11384 bytes
SHA-256: 24f69261020f1b83781cab3c1e788a087676fa5c25281d70f7f18914d2e2eaf2

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