Malicious PDF — malware analysis report

Static analysis result for SHA-256 29e3759d713e0758…

MALICIOUS

PDF

40.8 KB Created: 2020-11-03 07:48:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 981e80118791a2476f848fa067467081 SHA-1: 91b29f7eb9d455e7fffbeafd4bcce01044940d91 SHA-256: 29e3759d713e07586f8d6a1f4561e9f8e77bc36b07c284184de4546cf3e63ece
94 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The embedded URL is likely intended to lure the user into downloading further malware or visiting a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=forensics+textbook+fundamentals+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4422372/normal_5f9b66cd00a11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367287/normal_5f88358b854cf.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/d0857990-3091-449e-bd4b-b69193dc25c4/formule_de_stirling_dmonstration.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8a71c3e-9e96-4c74-9482-1651ff11ff28/13666999864.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/264d89a2-c010-4222-96df-ebded8fbfaa7/85337787254.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4652cbf-1495-4357-abce-9a5349972686/94776444946.pdfIn PDF document text
    • https://s3.amazonaws.com/saxefi/87455762598.pdfIn PDF document text
    • https://s3.amazonaws.com/fejenijovekozu/nuxajabenawazuvoxeret.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ed94345-28b9-473f-80f2-f8f44ead2711/85232995193.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7043d6d-b1bf-49e0-99d6-20348e11dd76/vipiki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/510aa8f1-58e9-4008-815e-ab92cdf16a7a/how_to_reset_toshiba_satellite_c55.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_off00005f9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F9E 5528 bytes
SHA-256: 7ebe01bc186de7570b9671c298763981660bed01ff8bb417dca8bc0b626664de
font_01_sfnt_off0000725b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x725B 10804 bytes
SHA-256: 00dbb30171138c093a2563039f60f20aed323875d543b7ae9b48872ccf87793e