Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6c9d83f7c0b5ad4…

MALICIOUS

PDF

46.9 KB Created: 2020-10-08 16:06:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: ae6de47b25089851186e1e7ec3de392b SHA-1: f3844b8e712dae9176799c1bafc87eae89680e68 SHA-256: e6c9d83f7c0b5ad4416ea8de706a3db0fffe202edd7576363aa0219a63465837
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a malicious redirector. The heuristic firings indicate a PDF link farm and a malicious redirector, suggesting the document's primary purpose is to distribute malicious links. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing or redirection attack, likely initiated via a spearphishing attachment.

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://ggtraff.ru/strik?keyword=magnetic+effect+of+electric+current+class+10+test+pdf In PDF document text
    • http://files.kbodiford.com/uploads/1/3/0/7/130776406/7815149.pdfIn PDF document text
    • http://files.aoneconstruct.com/uploads/1/3/1/8/131871462/kefakifiketuwa.pdfIn PDF document text
    • http://files.pantherbrake.com/uploads/1/3/0/8/130814121/5731276.pdfIn PDF document text
    • http://files.ccscsings.org/uploads/1/3/1/4/131437987/muruzajizo.pdfIn PDF document text
    • http://files.srhair619.com/uploads/1/3/0/7/130738949/wubopu_basawixigani.pdfIn PDF document text
    • http://files.barrenoneballet.com/uploads/1/3/0/9/130969242/228072.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/b6069d5b-2fe9-4c8a-b96b-49ec309920bc/27413864400.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da17e5d9-5a9d-45ea-98f2-de36f06f2258/13037097876.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e3ccde9-3138-4e81-9c44-8bfa2a6bcd7c/81742973091.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afa5bb95-8c4e-469c-963c-033d3b7b5a3c/sesiraloxirulam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecf28251-3f38-4dcd-a395-e7c029057a45/16835748043.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_off00007856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7856 5520 bytes
SHA-256: 5b6fe582a178df0dfdaabb805b24b58cc759641f288300684b3e97b342e45618
font_01_sfnt_off00008b40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B40 10376 bytes
SHA-256: 7dc0e1aa9867dd39c82fcde1c57beaaae35e45c3cfe04feddae8376e9f4bb896

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