Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8802320b85065d7…

MALICIOUS

PDF

43.0 KB Created: 2020-11-08 09:25:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 3db571cf4df82cdaf0d2637e356aa1bf SHA-1: 75dcedf03037b5af6090c31113586c3bf0a26460 SHA-256: a8802320b85065d7440f50473d0e8f70e4a56e421116ea0467c65a76f58bbcb6
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating it directs users to malicious infrastructure. Additionally, the PDF_SEO_LINK_FARM heuristic suggests a large number of outbound links, many of which are to other PDFs, likely for SEO manipulation or to obscure the malicious redirector. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/123?keyword=words+beginning+with+straight In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366400/normal_5f88397c11dfb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447467/normal_5f9e06ba80975.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420036/normal_5f9e8f1eb98b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383699/normal_5fa4d45f7c806.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379984/normal_5f8c0b943c21e.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/wukara/15434396674.pdfIn PDF document text
    • https://s3.amazonaws.com/digigitusuduk/going_postal_origin.pdfIn PDF document text
    • https://xoxajokar.files.wordpress.com/2020/11/dozejewerawolujapiliraz.pdfIn PDF document text
    • https://tojovaw651389336.files.wordpress.com/2020/11/21792196696.pdfIn PDF document text
    • https://direfaxa.files.wordpress.com/2020/11/44616410186.pdfIn PDF document text
    • https://pafegum.files.wordpress.com/2020/11/xumakosokidazok.pdfIn PDF document text
    • https://s3.amazonaws.com/varoximu/six_sigma_black_belt_study_material.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/deadf61c-6cdd-4939-911f-0ee992fea35e/1595322895.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/11th_zoology_practical_manual_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/retisovojor/16145644342.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_off000067c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67C9 5300 bytes
SHA-256: b76ee7f401c49457914b6c9e5ae3e6ca970813f2ef7142544dd01c4f270382b0
font_01_sfnt_off000079dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79DC 11160 bytes
SHA-256: 68cae4ac00446e3ea18a6f55453c4c73f2debb5c413787634b3aa8bb0ae28e57

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