Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f19dfcf2a657e87…

MALICIOUS

PDF

53.9 KB Created: 2020-11-05 00:37:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 20b2dbce2b70c1115b36ff5487c28f76 SHA-1: 35ccd37e4eaf072737b6ecfa01c991c0a4729f3d SHA-256: 1f19dfcf2a657e87b8fac62cda9a4a18a5e43e215cea399fef89fcabe194bceb
94 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a link to a known malicious redirector, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The embedded URL, https://cctraff.ru/strik?keyword=anatomy+of+arm+and+shoulder, is the primary indicator of malicious intent, likely serving as a lure for a phishing or malware download 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/strik?keyword=anatomy+of+arm+and+shoulder In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370777/normal_5f88f8a130856.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367674/normal_5f8931f32720f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366050/normal_5f8d606be0208.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374839/normal_5f91ad79ea113.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jepinebawo/groundwater_contamination.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ad34fda-8449-4636-b249-d047a7e33e57/fofadijeduvulimuke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/078b4802-495e-415e-88a5-6ea58e2b7036/80673038664.pdfIn PDF document text
    • https://s3.amazonaws.com/pibabopuduj/2454445239.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c46c410-331e-42a3-826d-391e54c35eae/wosizejeragujivosofofun.pdfIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/frightful_first_world_war.pdfIn PDF document text
    • https://s3.amazonaws.com/pusumowi/infantino_go_forward_baby_carrier_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06526dc4-0cca-4234-901f-624efa299c04/5794997536.pdfIn PDF document text
    • https://s3.amazonaws.com/nerugiraxura/wednesday_wars_activities_for_students.pdfIn PDF document text
    • https://s3.amazonaws.com/kewakuko/falling_for_the_ghost_of_you.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_off0000961b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x961B 5236 bytes
SHA-256: 7138ad6d9085e13cedd5ec5b6813cac05ec8e93d070260c85f7f078e8d11d8ab
font_01_sfnt_off0000a7cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA7CC 10584 bytes
SHA-256: af37fea1dce5fa731152d4efc792d694c9aea43c7fbdd1e706fd8015aea031b8

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