Malicious PDF — malware analysis report

Static analysis result for SHA-256 cffe3c39e68fc66e…

MALICIOUS

PDF

43.1 KB Created: 2020-11-04 18:28:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: a645da5c0a43d265f06b03628e23535a SHA-1: ba97a38dc09c5e7d1696a072c85e78c84def50ff SHA-256: cffe3c39e68fc66ea043caa26c0d77ea29c9e6e38045cbb5e8a17d47fbd417e3
94 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file 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 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/strik?keyword=singular+and+plural+forms+of+verbs In PDF document text
    • https://cdn-cms.f-static.net/uploads/4419851/normal_5f989cfdb7083.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467561/normal_5fa2c5dce57f7.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/5ea2d167-d00d-4113-a527-4f4f13d179e5/estimacion_de_costos_de_un_proyecto.pdfIn PDF document text
    • https://s3.amazonaws.com/muvojugejoxip/wagizenow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7680740d-4054-4b42-b774-c8d60def366e/gozegabosogojaxenovelovu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/769f5bbf-861a-4621-a9f0-a4e3600dcb7f/84780887973.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccdfedbd-588c-445e-af26-30f3e92f95a4/36768754261.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11008132-7ff2-4ed3-a96c-7d03e9a35770/butamozo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4c70e72-d697-43ba-ba68-c6deaecd9f5e/tubewefedixotazimubaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c2c71f6-6a20-40a3-b290-15eefdd8f17b/mamumuguzogi.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/chemistry_notes_for_class_11_up_board_in_hindi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/326eba67-dbf4-427f-95b8-b88282b026f1/soul_urge_number.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cc2216d-a4c6-431e-a50a-f7f71050a5db/87750806800.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/213e3fcd-7d1c-4500-b708-94f4a1b79466/bonedimo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbe3cdb6-8be2-4314-b6ed-70cb9456f12f/council_bluffs_warrants.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_off0000690a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x690A 5664 bytes
SHA-256: 85bf9309a91d8c573b8b802541eaa6f3b1f9bf7dde06111fa8b2a0e2f244b495
font_01_sfnt_off00007c42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C42 10360 bytes
SHA-256: 595f273f80a427e8a6ff6f5f52e7122c14f09009677ae61069c25be9d11c8609

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