Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3c27b3d7e8974db…

MALICIOUS

PDF

68.3 KB Created: 2020-11-04 17:28:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: e21f63a5750d7412337a0758d2a8547a SHA-1: b58d98821b0fa6bacc4a3dfa0223829cfbcea2b2 SHA-256: f3c27b3d7e8974dbfe1ce90ff036525e96ad619d86b6faec8212b5d136423e10
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a significant number of embedded URLs, with one identified as a malicious redirector. The heuristic firings indicate this PDF is part of a link farm, likely for SEO manipulation or to distribute malicious content. The ML classifier strongly supports the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://ggtraff.ru/strik?keyword=can+pregnant+sims+die+sims+4 In PDF document text
    • https://kokubexajaluk.weebly.com/uploads/1/3/2/6/132681668/1076701.pdfIn PDF document text
    • https://luragelekow.weebly.com/uploads/1/3/4/3/134377287/0f77c08.pdfIn PDF document text
    • https://fexatawolev.weebly.com/uploads/1/3/4/4/134445796/jipewe-lejolelawivomu-dasudiki-radiwutunojem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386347/normal_5f8d6bb93a4f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425514/normal_5f9fb16911bdb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391621/normal_5f8f1c3ea688d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369525/normal_5f90a623d7010.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/ea0cd431-6a9f-4542-aac1-895371c16629/new_castle_airport_car_rental.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a5b025b-5f90-4912-a137-085a3691a448/92805413302.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a8159a6-8ecc-4e1e-a552-4b4a33621d51/lereronirakivopigozoroj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36e57259-15d0-475a-8d69-66ec8d80e2d7/moon_reader_pro_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aff08718-ff57-4761-b64c-a24e8aed6516/63636315370.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a9aa791-a3d8-4e4a-b021-d84ee14c578e/penn_jillette_god_no.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA79 5240 bytes
SHA-256: f0b285209eea95d5a5693588b0d58f8cb0cb431e21d81b79bf0209af21cb101f
font_01_sfnt_off0000dc34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC34 11792 bytes
SHA-256: 00229ad7f1e191e2f65325376ba66dd42e9f01fd143f1ee9f4179d90ed092b1a

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