Malicious PDF — malware analysis report

Static analysis result for SHA-256 da7161ac88fcdaac…

MALICIOUS

PDF

44.8 KB Created: 2020-11-03 21:10:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 360511d9316cc13c920a7b8ba68f4847 SHA-1: 92b677b187242c3bbbb955dcbafe7affb93fad76 SHA-256: da7161ac88fcdaacbefa58bc98b277cb662f3c124a91df8c0251dbb39a7446a4
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/aws?keyword=vietnam+war+timeline+1967 In PDF document text
    • https://tulejimukun.weebly.com/uploads/1/3/4/3/134399478/2446130.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382186/normal_5f948fb1b684e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366313/normal_5f8719e879df6.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/2d824261-7cf4-4443-8932-c985fc140795/kiliferem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4e28c1d-77d6-4e6a-bed5-6d22adb7bc7f/77538032692.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e1694d6-cb54-44dd-94f3-87a401b82d84/53429754136.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07b1d006-8ad8-4437-8df9-cad7e07346ea/4533336385.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/771892e5-7d24-4bab-ba7b-8ac24ab68d65/m_management_5th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/787381c5-13e8-41d3-80b1-37ea717afb87/voboraj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d33bb7fc-6379-4972-838c-0cb9eb3c0e44/7734008879.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ebed6ff-aaf0-4e74-985b-84f858c1bbbd/datasheet_of_741_ic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eaa2cf44-f55f-489f-891c-62db479aa423/55813668383.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4f4c99d-3e79-4258-991d-464fa800282d/23362377850.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74c28555-6d65-40b8-8a8f-9d2232fe61b7/fimurivuledeg.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_off00006ea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EA6 5152 bytes
SHA-256: 3d0837287012f41b07c29b9c73ba1fbdaef2115d8cf2148812d483389f7b2dc0
font_01_sfnt_off00008033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8033 11124 bytes
SHA-256: 179f6f96d00a9185d2b469c1ce123cbef6712fb066817bfd58dec8e3375a7097

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