Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5716b0c27ccf956…

MALICIOUS

PDF

44.1 KB Created: 2020-11-07 17:39:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: a7eec97a71f5f5154853e7075af9f455 SHA-1: eff74a8d5478c03386a5ab4df00bde528020a2fe SHA-256: d5716b0c27ccf956ef8e1965d47fc4b1a413d3463c8e9750de25527589fd1b83
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of the primary external links points to 'https://trafffe.ru/123?keyword=johnny+weaver+pro+wrestler', which is suspicious. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially malicious or deceptive content.

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://trafffe.ru/123?keyword=johnny+weaver+pro+wrestler PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4422914/normal_5fa5929eb7e75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370263/normal_5fa3c5e39bc75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367938/normal_5f92a79d3aa06.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445742/normal_5fa1900fc4e87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368226/normal_5f995f247b50d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404741/normal_5f98715690da9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411511/normal_5fa238d5d2d3b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/334fa820-79db-4432-b483-1974a12f9a77/somoni.pdfIn PDF document text
    • https://s3.amazonaws.com/jaxesabi/data_representation_c.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5ed748c-3441-4f99-8d4d-bf9e03f68149/wsus_install_guide_2016.pdfIn PDF document text
    • https://gigevuko.files.wordpress.com/2020/11/47523579109.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/auxinas_funcion.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_off00006dc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DC5 5148 bytes
SHA-256: d22519ac1ba47ec5d28860adeb52b9e25daeda27623ad86dbe1daff0ace23092
font_01_sfnt_off00007f5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F5F 10780 bytes
SHA-256: d861f239845e090018bc28854fbe9e58991983e4b0572db637b3a49cc0826f46