Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fd41964feca3411…

MALICIOUS

PDF

42.1 KB Created: 2020-11-08 13:55:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 02745f396287b1137541eb0e84337c3b SHA-1: 12f924d2caf3888fe89723487e6057ffb19f4ae8 SHA-256: 5fd41964feca3411963bfcf8fdb19e5bd3ad805c9af43caaf86189eabe0bf389
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. The primary external URL observed is 'https://trafftec.ru/aws?keyword=spanish+to+english+words+hey'. While no scripts were explicitly extracted, the presence of numerous external links suggests an attempt to redirect users to potentially malicious or SEO-abused content, possibly as a lure for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafftec.ru/aws?keyword=spanish+to+english+words+hey PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4470677/normal_5fa6f98c7000a.pdfIn PDF document text
    • https://tasepatoravolun.weebly.com/uploads/1/3/4/3/134352318/gatekenefufumo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368238/normal_5f8870dd016c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367650/normal_5f875fc94ca72.pdfIn PDF document text
    • https://rikisuluwujufa.weebly.com/uploads/1/3/1/4/131452938/jobadamex-gonobamoda-femixixaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389830/normal_5f9a5f902d0bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366388/normal_5f88b7d528f41.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374522/normal_5f8b9bfadc789.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/dazemi/addiction_severity_index_lite.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7597d405-b8b9-43c7-93a3-de609e68266c/dorifufowapa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3155ddf-4355-4c83-b2d7-4b3db7963c28/68193415657.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b9d6af3-35ca-4835-8c23-bca1bf4bed5f/siloralujixekelavibefof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3d1d142-16dd-4a12-bc81-240e4e983bb2/15205786881.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d3e43a7-5cb0-4b94-8753-64c511c75408/restaurants_around_nationwide_arena.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_off000065f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65F3 5520 bytes
SHA-256: f6bb8fa3755cb5dbd317ae24b7725527d4cdd22d3bee8cca29f5ad60cd6abd8f
font_01_sfnt_off000078c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78C4 10360 bytes
SHA-256: 8776f721c051b4c0c7414d0a2795c9bc70ba079964573f4ed16777b861c5e511

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