Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a38cb1e3bf32f2a…

MALICIOUS

PDF

41.5 KB Created: 2020-10-31 20:18:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 38cd0c79ece55d8ea3ecfd8ed0185f04 SHA-1: d9d0abaf0867d72c9a5a52d8777b9dafd705b1f0 SHA-256: 7a38cb1e3bf32f2a88f9183a5733dfa0f593f037ca33972e3e32326b6a473ee0
154 Risk Score

Malware Insights

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

This PDF document is classified as malicious due to its extensive use of embedded links, many of which point to external resources. One critical finding is a link to a known malicious redirector, https://cctraff.ru/aws?keyword=bfa+st+albans+hockey+roster, indicating a high likelihood of user redirection to harmful sites. The document also contains a large number of other PDF links, suggesting a link farm or attempt to distribute further malicious content.

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=bfa+st+albans+hockey+roster In PDF document text
    • https://cdn-cms.f-static.net/uploads/4409614/normal_5f935453c0672.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374537/normal_5f8f418ee2495.pdfIn PDF document text
    • https://xogexemufak.weebly.com/uploads/1/3/1/4/131437987/jodesox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370540/normal_5f9429e563084.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369512/normal_5f90f3703cdc5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387709/normal_5f92cf27c0a47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380682/normal_5f8c73b8954b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365598/normal_5f886895ee403.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393901/normal_5f976f9fc9616.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/91455cf0-c836-45d6-b926-3d948ccc8978/mechanics_of_materials_7th_edition_p.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f4e037f-66cb-4c3d-bb27-b4771260c94b/potawegesuvuzun.pdfIn PDF document text
    • https://s3.amazonaws.com/levumoduf/68455427904.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_off000062f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62F7 5324 bytes
SHA-256: 0097a8f42aae48be6a81be32331a7fe2cd48bf2de13eb2d639281398e6402906
font_01_sfnt_off0000751b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x751B 10676 bytes
SHA-256: ec74b43209020a78541664d7f580a4af90ffb0231fbd19d2b9aa40a10e8630b1

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