Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef3f0eebf99cb764…

MALICIOUS

PDF

57.3 KB Created: 2020-10-31 17:14:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 7b99551f61268a0d3fab1d0e98296b2d SHA-1: 355d344bb345f5b6e6a975bf9b3d0d205ebe2c0d SHA-256: ef3f0eebf99cb764266062c4f1a8fcd92c2caa16113fc6c4f5dea388fd0526b8
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector and others forming a link farm. The primary purpose appears to be directing users to potentially malicious or spam-related websites. No scripts were extracted, but the embedded links are the main vector for malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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/pify?keyword=mayor+lionheart+heroes+wiki In PDF document text
    • https://jobubati.weebly.com/uploads/1/3/1/4/131453688/ca710ab8dee.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/pamilezazarejifa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369182/normal_5f8bc9cc18614.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366628/normal_5f8737badd249.pdfIn PDF document text
    • https://laxigozi.weebly.com/uploads/1/3/4/3/134361341/daa5ac2cd07598.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380680/normal_5f8b49fcc0be7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385422/normal_5f9b60c0713b0.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/0cd81322-2c4f-40ce-ad33-b16b21e9e32c/buxesajelidepidakunitoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61145043-b8d8-4005-909b-3fb877a5fc9e/51401802958.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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000089da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89DA 3160 bytes
SHA-256: 28b2b4ab6a217d97e2b74e3c82607aa4f2623eda9da3a9ece76fea542eea1558
font_01_sfnt_off00009524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9524 5036 bytes
SHA-256: 5c2712a30fd84d6cc1d832c771f73f98415e49a411881661270397c45120e786
font_02_sfnt_off0000a655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA655 2744 bytes
SHA-256: cb03acd017500927988b7e50e495582682f6c23237ddc20251056c6592ca1707
font_03_sfnt_off0000b201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB201 11504 bytes
SHA-256: a452427e7b00b264152f8c8d1a70962faf08d572590d4b988a47d70bd71784ea

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