Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb93bb1253bbf2f5…

MALICIOUS

PDF

46.5 KB Created: 2020-11-02 03:49:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0be63091cc316a2ec0166039b7b76115 SHA-1: bd58f04ea88502f8da04813ff238eab7c49b171f SHA-256: eb93bb1253bbf2f5f6b99ba06c1a823e31fd539ecd3d145c6bcf2d2a5142f73b
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://cctraff.ru/aws?keyword=fancy+pants+adventure+2+unblocked+games+6969'. This URL is presented within the document body, disguised as a game title, to entice users to click. The PDF also exhibits characteristics of a link farm, with numerous external links, suggesting a broad distribution attempt. While no scripts were extracted, the presence of a malicious redirector and the ML classifier's high confidence indicate a malicious intent, likely for phishing or malware delivery.

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://cctraff.ru/aws?keyword=fancy+pants+adventure+2+unblocked+games+6969
    • https://cdn-cms.f-static.net/uploads/4366665/normal_5f8b2ee3ef09e.pdf
    • https://cdn-cms.f-static.net/uploads/4365602/normal_5f8776b5822f3.pdf
    • https://cdn-cms.f-static.net/uploads/4419424/normal_5f98f343ae07a.pdf
    • https://cdn-cms.f-static.net/uploads/4367921/normal_5f89db28036c7.pdf
    • https://dudikojegak.weebly.com/uploads/1/3/1/4/131406444/e1667a87f71a7.pdf
    • https://besavikeneg.weebly.com/uploads/1/3/2/8/132815808/jodetebanud.pdf
    • https://cdn-cms.f-static.net/uploads/4404966/normal_5f92c22e53ab6.pdf
    • https://cdn-cms.f-static.net/uploads/4382961/normal_5f8ede9ae01ff.pdf
    • https://cdn-cms.f-static.net/uploads/4407571/normal_5f96d50563f50.pdf
    • https://cdn-cms.f-static.net/uploads/4372673/normal_5f8abcb12c2d5.pdf
    • https://cdn-cms.f-static.net/uploads/4370996/normal_5f8b759f38ed8.pdf
    • https://cdn-cms.f-static.net/uploads/4385434/normal_5f8de398f086d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/1992/6679/files/gimejajabamu.pdf
    • https://s3.amazonaws.com/fasanag/maharashtra_board_11th_biology_textbook_download.pdf
    • https://cdn.shopify.com/s/files/1/0496/5217/0908/files/quantitative_research_study.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000721c.bin
191f35bfc6d2cf9172ce53b2b2760c48464d0cdbb162c75fd2f5ec13031d2ac8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x721C 6156 bytes
font_01_sfnt_off000086fa.bin
65934309e72029f3dcc2814813e29d5c405b71aaaf37c93edad3f72f202cca09		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86FA 11008 bytes

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