Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9be928e11fa73f3…

MALICIOUS

PDF

43.7 KB Created: 2020-10-15 00:11:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 66bde310ff8d6366bd04579c446ed95a SHA-1: 57c63c892181a44018bd9cf129222ea9ddcb15ba SHA-256: c9be928e11fa73f397e27d7f1e1f64c8b5fa57e0587b6cc77bbfa0a0d911e644
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to known malicious redirector infrastructure or are part of a link farm designed to manipulate search engine results. The primary malicious URL identified is https://cctraff.ru/123?keyword=prosthodontics+viva+questions+pdf, which is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to academic content and URLs, suggesting a lure to trick users into visiting these malicious sites. No scripts were extracted, but the presence of numerous links and the ML classifier's high confidence indicate a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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/123?keyword=prosthodontics+viva+questions+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366348/normal_5f876817d2b07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366063/normal_5f87692313387.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365649/normal_5f8747bae75a9.pdfIn PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/kasodopizafazakoxuk.pdfIn PDF document text
    • https://vuzevarezevarot.weebly.com/uploads/1/3/0/7/130740461/didus-zafuvij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366388/normal_5f8712319ddcc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366371/normal_5f8768af06dba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366045/normal_5f870630cacf1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366000/normal_5f87045cc7312.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365655/normal_5f874bb4a9086.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/d8ae63fa-c3a8-44db-ae8b-5138974bdcaf/37122282670.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ee0c692-0ff8-41af-a2e1-c13452be43c4/60937262345.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b86f7cfe-959c-46ed-af11-b4235f6596d1/400422180.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/9364/2404/files/xiwiduda.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/1108/8799/files/23564037827.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/0715/8690/files/starfinder_combat_actions.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/0436/1366/files/97112232148.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/4328/5923/files/western_food_menu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/2331/1263/files/flesh_tone_rgb_code.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8260/2904/files/llamados_de_dios_al_hombre.pdfIn 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_off0000786e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x786E 5400 bytes
SHA-256: 6866acde8c75744d5b05d209cba4262e3ddecd0931577e6ba8df14219402ac5e
font_01_sfnt_off00008ac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AC2 9996 bytes
SHA-256: a259f8b87644c384c38870e2930d20dfb814d036c77d050f91a63b990f0f0e30

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