Malicious PDF — malware analysis report

Static analysis result for SHA-256 26a7b63e54ce056c…

MALICIOUS

PDF

33.1 KB Created: 2020-11-01 17:58:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 087eabd731124e85849b5b21eb3263be SHA-1: 9332effacad839e011267874864f1cbff388038b SHA-256: 26a7b63e54ce056c14e5beba9b04511d2bf2fd4de404ea239c62db23144f0c32
94 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a link to a known malicious redirector infrastructure, identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The ML classifier also strongly flagged this PDF as malicious. The embedded URL 'https://cctraff.ru/strik?keyword=cooking+methods+worksheet' is the primary indicator of malicious intent, likely serving as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/strik?keyword=cooking+methods+worksheet In PDF document text
    • https://cdn-cms.f-static.net/uploads/4408172/normal_5f942f37777cd.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/gotenukevepunin/stable_program_test_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/46308858613.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/27868033678.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7261bc32-9fdb-4ef9-aaff-6892c007c892/78548960028.pdfIn PDF document text
    • https://s3.amazonaws.com/tugumeb/3510238061.pdfIn PDF document text
    • https://s3.amazonaws.com/rijaliwiguvex/64769194030.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c6d56b2-83bd-444e-b777-f051af11d105/28999354791.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/44964623786.pdfIn PDF document text
    • https://s3.amazonaws.com/muvojugejoxip/printable_railway_reservation_form.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/chemistry_math_review_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/sabegokek/xufadoji.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/16034843968.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_off000045d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x45D8 5056 bytes
SHA-256: 4179b1bdae0250d0739e7eb2b0b78fed8ee942a28147e6e44710af3d41f8bbc6
font_01_sfnt_off000056f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x56F2 9808 bytes
SHA-256: e2cd9a038bc829c1e74be6701e85a9aec2c4e39a1319adb7e2153bdc032b0734

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