Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8601507053c30bf…

MALICIOUS

PDF

40.4 KB Created: 2020-11-06 16:28:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 33f0156818da210dc023527bba6bffe1 SHA-1: b94cca646e1434e1f697926e8455e22f1c52c106 SHA-256: b8601507053c30bfe3013165bfa5a8f0be42d7ce9495eb297dd3d7db624e5ab7
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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://cctraff.ru/strik?keyword=brain+games+worksheets+adults In PDF document text
    • https://cdn-cms.f-static.net/uploads/4409394/normal_5fa082b4b7922.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368471/normal_5f87ce26897a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365594/normal_5f87f6953e43c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378855/normal_5f8a2f8500cf9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369660/normal_5f9974dc6dd39.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377678/normal_5f9d951cb227a.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/1f06b8d9-9a48-4181-8360-ce99ed054116/lego_remote_control_car_app.pdfIn PDF document text
    • https://nelavikix.files.wordpress.com/2020/11/73736449421.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5b732f8-a9f8-4f84-87fb-1ac94c4db6f9/gubovebaguxaboxono.pdfIn PDF document text
    • https://nelavikix.files.wordpress.com/2020/11/tulifeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7c8bd1e-d4a5-422a-a44d-8ea05757a115/zefulufinaniwajogesug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac36daec-c3b8-4915-b28f-3376965b7c7d/29401245672.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a09c2ed-f41c-4320-8d59-0390474cda6d/sims_mobile_apk_hub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fe1b638-142f-4b7a-a18b-e7b06a90786e/civil_service_reviewer_with_answer_key_2016.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_off00005db3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DB3 5444 bytes
SHA-256: bce4062c746a1660e7db3dd680fa0e2e8323f420fbee53b017314d0e6a99c67c
font_01_sfnt_off0000701e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x701E 10676 bytes
SHA-256: 9c501be90f9b814cfd181e3cfa102c57fed9026c6b956d937dfd17251d662d58

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