Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f28f431aef4b683…

MALICIOUS

PDF

37.5 KB Created: 2020-11-03 13:03:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: bd1e28ffcedba4447faabbe43b36e0f9 SHA-1: 900c3ea78913b781e2078d09ff4a1e7095433d56 SHA-256: 4f28f431aef4b683a6edad95a8da45b13c755aba4864e6be14b8bba26e4f5b3d
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://gettraff.ru/strik?keyword=dr.+iqbal+sorathia+bath+pa In PDF document text
    • https://cdn-cms.f-static.net/uploads/4374536/normal_5f9318efd3347.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374369/normal_5f891dfc728e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369776/normal_5f924c139f30d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426572/normal_5f98657213fb4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0494/7342/1479/files/chapter_5_projectile_motion_5.1_vector_and_scalar_quantities_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/40773498858.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8134/3903/files/autonomic_nervous_system_textbook.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/39966998356.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e2da009-79e1-498e-b84d-413ffd97265b/8830917308.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6283788d-5cb1-4606-95d7-ec04cb308fae/xexuxavanumujixe.pdfIn PDF document text
    • https://s3.amazonaws.com/nupotukig/rageruwanupu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e29af72-bad1-4ffb-ba89-074132943caa/ff14_mining_guide_60-70.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000047d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x47D7 4768 bytes
SHA-256: 0cd5e6ac143009cb5221d730737865b6b3d77fdcef357b046330b47be321eeb2
font_01_sfnt_off00005810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5810 10396 bytes
SHA-256: 37e57d75bab2615c6e09e37a68ddaeeaf47b6bc31bf5208d8156b3956ffbd0d6
font_02_sfnt_off00007b9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B9B 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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