Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1f806811a37971a…

MALICIOUS

PDF

37.9 KB Created: 2020-11-07 21:34:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 82527712ace8cadd2cc33d71d022e80f SHA-1: b945afabe349827e0db9bdf37781336c3a6a6887 SHA-256: e1f806811a37971a85a17f11ab6919b3260014b0c0806cc3126da48963f138e5
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, including a suspicious URL to 'traffine.ru', suggesting a link farm or SEO spam tactic. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the PDF structure indicate an attempt to redirect users to potentially malicious 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://traffine.ru/aws?keyword=go+math+grade+5+chapter+4+review%252Ftest PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4448343/normal_5f9e0b0363d0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369908/normal_5f8bf3cc9a2dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366063/normal_5fa49e63315df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365546/normal_5f890a9c12525.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384628/normal_5f8c4fc4328c2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://bimozevuve.files.wordpress.com/2020/11/kuroruzafeluregipozag.pdfIn PDF document text
    • https://s3.amazonaws.com/ligole/wegenabeboli.pdfIn PDF document text
    • https://s3.amazonaws.com/sojebelevenex/walonadese.pdfIn PDF document text
    • https://nomuxuvo.files.wordpress.com/2020/11/belomuker.pdfIn PDF document text
    • https://manetomimexa.files.wordpress.com/2020/11/68091325827.pdfIn PDF document text
    • https://s3.amazonaws.com/bubeto/90928233217.pdfIn PDF document text
    • https://s3.amazonaws.com/divelatoxa/xijoripalizimeridinezu.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_off0000533b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x533B 5888 bytes
SHA-256: c6eb75fd2a7fd4acc7d5c1ba92a9ce987cee8eb13b166a6f85ce8d5e48fc1b52
font_01_sfnt_off00006741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6741 10492 bytes
SHA-256: acc1a7715bd47597124b085cd3bc3f993fccc75d1467222f333d074dc7d70803