Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec033d51130a252b…

MALICIOUS

PDF

29.5 KB Created: 2020-11-07 08:09:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 494dcd9fb3135da9f067ae8e1d986900 SHA-1: 2cb210b05ff46d84e0406a4e509a4daa4d58bb0a SHA-256: ec033d51130a252b031640b0e439a677c5107fddf6cc9850e98302737dcd398d
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only lure, typical for phishing or malware distribution, containing a clickable link to 'trafffi.ru'. The heuristic 'PDF_SEO_LINK_FARM' indicates the presence of numerous external PDF links, suggesting a coordinated effort to distribute malicious content. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 29 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://trafffi.ru/aws?keyword=filmes+online+gratis+subtitrate+2019 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366309/normal_5f8a43b3ec393.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368249/normal_5f87f9dae3333.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372673/normal_5f8cf3807faff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371497/normal_5f9ae77ba7f67.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/dorobukasawituw/66927714112.pdfIn PDF document text
    • https://s3.amazonaws.com/piradi/vikusizekaj.pdfIn PDF document text
    • https://s3.amazonaws.com/voxipanovigepiv/xufab.pdfIn PDF document text
    • https://tojovaw651389336.files.wordpress.com/2020/11/21792196696.pdfIn PDF document text
    • https://sisivepigol.files.wordpress.com/2020/11/gepipodo.pdfIn PDF document text
    • https://rafawabu.files.wordpress.com/2020/11/neraretirinizos.pdfIn PDF document text
    • https://s3.amazonaws.com/jufowokedunod/11112873642.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/27907244261.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_off00003b85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3B85 5580 bytes
SHA-256: 83a0c7e67cdef1383d9c264bcb1d17275537b0ff6e12cca1d0d824f0329b6f3b
font_01_sfnt_off00004e63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4E63 8228 bytes
SHA-256: 81eae64055e1bb396ed72fb9738c6521cb92329c444562f9e14471da068ec82c

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