Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe43e3d75ecb800d…

MALICIOUS

PDF

70.3 KB Created: 2020-11-16 22:07:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b9faae1813954ba3d9961af5d2139d63 SHA-1: 6311b60a1c567e9bfe563c48cb0339b6781a8f8d SHA-256: fe43e3d75ecb800dadb66a2cf3e534724f22b8e9c83fd7e514b2e24eb8789cd7
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a significant number pointing to other PDFs, suggesting a link farm or redirection scheme. The primary malicious URL identified is 'https://traffine.ru/123?utm_term=coaching+agile+teams+lyssa+pdf', which is likely used to redirect the user to a malicious site. The ML classifier strongly indicated maliciousness, and the PDF structure itself is flagged for containing a mass of external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffine.ru/123?utm_term=coaching+agile+teams+lyssa+pdf
    • https://valekide.weebly.com/uploads/1/3/4/5/134584612/kipafolesan.pdf
    • https://fuxamuwilemodo.weebly.com/uploads/1/3/4/4/134478429/1201163.pdf
    • https://cdn-cms.f-static.net/uploads/4494432/normal_5fade73a8c9c2.pdf
    • https://nipufijupetobug.weebly.com/uploads/1/3/1/4/131482996/degebexugetumiz_derivarupokazi_vigawogu.pdf
    • https://cdn-cms.f-static.net/uploads/4369336/normal_5f8e456b60ed0.pdf
    • https://cdn-cms.f-static.net/uploads/4384628/normal_5f9bc47f291d1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f6d0ee92-7ec3-42aa-afc5-d096129c856b/60704808237.pdf
    • https://uploads.strikinglycdn.com/files/8fcb033b-227c-402b-99f7-e6965d0d839f/56357306231.pdf
    • https://uploads.strikinglycdn.com/files/0725b51f-e749-49d2-a64e-5056ad6b662c/rich_homie_quan_download.pdf
    • https://uploads.strikinglycdn.com/files/8330c73d-a4c4-4e6a-bf5f-1d8a2cd45cdb/5568519517.pdf
    • https://uploads.strikinglycdn.com/files/1bd5d6bb-bf62-49d0-b222-2bb1d0c277bd/72641606264.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_off0000d6a9.bin
ab45d33cf77cbf92d9aafa1764522851a2538095af3c892bef1f1e0eb30a103d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A9 5480 bytes
font_01_sfnt_off0000e933.bin
656e11ae37b501788ff632cb0bb1af180765060a6b2026bd0da89ac145a4c972		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE933 10508 bytes

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