Malicious PDF — malware analysis report

Static analysis result for SHA-256 90c963d0c62174e9…

MALICIOUS

PDF

81.2 KB Created: 2020-10-30 22:02:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 53bc7e38b7301270ade9975468117a17 SHA-1: 72ee55df2a3d7154cad64f057ce517d235da762a SHA-256: 90c963d0c62174e9ed1b0a74d1ad8755b7dd39e5488949a1be6c76ac16ad3104
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. Additionally, it exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDF files. The primary malicious URL identified is https://cctraff.ru/aws?keyword=mechanical+engineering+drawing+symbols+chart+pdf, which is likely used to direct users to a malicious site.

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=mechanical+engineering+drawing+symbols+chart+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366381/normal_5f895079da299.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382003/normal_5f91cd18d843f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379030/normal_5f94571297f09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402478/normal_5f9a2b86052cd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/1925cb47-30e4-44c0-a956-3692da8e20a3/levn_ojet_vozy_na_prodej_v_amarill.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9245/2547/files/97577202087.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/8744/9250/files/zumenezufajuwodutov.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/2996011627.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/72014713826.pdfIn PDF document text
    • https://s3.amazonaws.com/xojafemori/nivezofonem.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/7752/8473/files/lime_juice_substitute_for_fresh_lime.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32706405-812d-46bc-ab78-d9e692b02dff/fejem.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/5046/4945/files/vexipo.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD919 5696 bytes
SHA-256: fc8ab15a31ee085ebe898cec218e53aa124ea56205a7af80f72e93716cd55a39
font_01_sfnt_off0000ec56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC56 11836 bytes
SHA-256: 4a407cc242cf9b1c693d0988aa46634c1df3781356cf25d98bb96d26c64b8cc4
font_02_sfnt_off0001139c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1139C 16176 bytes
SHA-256: b4fb19a290088d888934f02a7577606e8914557394ffe72a8ab6ca50870400aa
font_03_sfnt_off000128c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C0 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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