Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3bfe4cfe8bb0df3…

MALICIOUS

PDF

38.5 KB Created: 2020-11-05 04:23:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6492fc230040bbeaeac4bb1a0c3891e5 SHA-1: 575568367600abca8237e3020b05ab8c30a351c2 SHA-256: f3bfe4cfe8bb0df3d1f21fb0142fb903f7721f964d6cf4a3ec0597e94f5617e4
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, disguised with a keyword suggesting educational content. The ML classifier strongly flagged this PDF as malicious. The embedded URL is the primary indicator of malicious intent, likely leading to 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://ttraff.link/123?keyword=codominance+worksheet+answer+key+genetics
    • https://cdn-cms.f-static.net/uploads/4428069/normal_5fa3464e17404.pdf
    • https://cdn-cms.f-static.net/uploads/4393904/normal_5f98289f106b0.pdf
    • https://cdn-cms.f-static.net/uploads/4380692/normal_5f91f95f8a565.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/84fc53fd-f904-49fb-ac31-fac51be4d63b/65598199094.pdf
    • https://uploads.strikinglycdn.com/files/55f7c3ef-dfc5-4c5f-a64a-4b900940ac09/wuwixuduso.pdf
    • https://uploads.strikinglycdn.com/files/d123e730-3f78-46bd-82e2-200dc5216918/mosujejuxivaxakewo.pdf
    • https://uploads.strikinglycdn.com/files/93785e47-c672-41fb-8b6a-a42789c3adc5/lotupuxuvisitewizoro.pdf
    • https://uploads.strikinglycdn.com/files/b88999dc-e5b2-4b66-936a-5a860bf1c040/73778350662.pdf
    • https://s3.amazonaws.com/sazixipame/adobe_premiere_tutorial_free.pdf
    • https://uploads.strikinglycdn.com/files/84d628a3-07c4-4a7b-a238-e8392876eb9c/44968158131.pdf
    • https://s3.amazonaws.com/belapawerezuju/have_love_will_travel_original.pdf
    • https://s3.amazonaws.com/wupiwupiwot/leselebemabutawutijeveme.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000056a9.bin
b4e80e25729ae1fa47827f37d3a16c14b1db11c62f06fe2f7cc00426f6a3d589		 pdf-font-stream PDF embedded font (sfnt) at offset 0x56A9 5484 bytes
font_01_sfnt_off00006936.bin
62f0f6c1f4d17891991d800d9fba59594777bd2d77daac0b43f0c187ee5dd3f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6936 10560 bytes

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