Malicious PDF — malware analysis report

Static analysis result for SHA-256 af1737cd89682794…

MALICIOUS

PDF

44.1 KB Created: 2020-10-27 08:42:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 132d6626b739063958974b796dd14339 SHA-1: 24f027ef0d3dbd3e03f22929d87b4206ba41f46a SHA-256: af1737cd89682794a3b2e3f8f210281bdee992977a33b981b9db32ff6d212096
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://ttraff.cc/123?keyword=texas+blind+salamander+for+sale In PDF document text
    • https://cdn-cms.f-static.net/uploads/4387815/normal_5f909477853f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385617/normal_5f92305b31e9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374024/normal_5f88e7bc26010.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413473/normal_5f978b23db776.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368745/normal_5f87a610a7493.pdfIn PDF document text
    • https://sujajikozodes.weebly.com/uploads/1/3/1/3/131384638/1161639.pdfIn PDF document text
    • https://penepanixefi.weebly.com/uploads/1/3/4/3/134354239/dafarurixur.pdfIn PDF document text
    • https://buveziketi.weebly.com/uploads/1/3/1/3/131398526/vupuxa.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/bidivo/speaking_exercises_for_english_learners.pdfIn PDF document text
    • https://s3.amazonaws.com/sisaxu/administrative_law_notes_tanzania.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/cauchy_euler_equation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef48d38c-092a-407b-b302-83c13b1c7ec5/first_aid_step_2_ck.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35430431-f952-4b50-9559-3d45d14d256b/48168559334.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4d29a72-47c4-49b2-a4c8-a0ae129dce77/74885863519.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cebba959-29f8-425a-99b4-4947445deddc/mC3BCrC59Fit_5_indir_C3BCcretsiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c4b4bef-6e62-4932-9431-10d3d33623bf/14853550821.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0047be1b-3bd3-4a19-8b41-09fabe9f91db/31044383444.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/75239797464.pdfIn PDF document text
    • https://s3.amazonaws.com/debamijizozexo/sofilojagefobimazudojetav.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_off00006c49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C49 5208 bytes
SHA-256: 983f9dcf943501806dd3aa21506b5ddbafc66b0b0b40322a90a2c116f810c976
font_01_sfnt_off00007de0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DE0 10844 bytes
SHA-256: 44616e714a41121a6e06ab3b1b8bae00f0114f4e6f4b1fe91dced7ace8d06d4c

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