Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c8c2012e0a04135…

MALICIOUS

PDF

98.5 KB Created: 2020-10-27 14:31:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 4e3a7bf94575f23a035faf50ce73e23e SHA-1: e429f0e2a37a12e1cdd4cd139d6659b201336418 SHA-256: 2c8c2012e0a041351b89216ddccd4692dfe8129dabd0eb21d27ff9ab41e6c968
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One of the primary URLs, 'https://cctraff.ru/strik?keyword=ee+guided+electives+utd', is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated and contains the malicious URL, reinforcing the redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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/strik?keyword=ee+guided+electives+utd In PDF document text
    • https://cdn-cms.f-static.net/uploads/4374963/normal_5f9506d42b6b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389793/normal_5f8e7ca5bd90b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404733/normal_5f95b37e1ab00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369330/normal_5f890c54b4ae3.pdfIn PDF document text
    • https://naroxelilokatud.weebly.com/uploads/1/3/1/3/131384214/9a35ee.pdfIn PDF document text
    • https://nukawopuriw.weebly.com/uploads/1/3/4/3/134347541/43f80adb0b453.pdfIn PDF document text
    • https://relogeseji.weebly.com/uploads/1/3/0/7/130739887/benepokapo_gugik_tifogub.pdfIn PDF document text
    • https://solujokorox.weebly.com/uploads/1/3/4/1/134108712/dapogaxomum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368265/normal_5f963c2b92569.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365584/normal_5f86fe8792ea3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380858/normal_5f95bed621326.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369900/normal_5f9010f899cc0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372104/normal_5f90bc435696e.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/292e90ea-b6c6-4644-aec1-ded3641b8a61/91596982976.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30f4280e-d451-43c9-a34f-7d01af7aad10/ralovipi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3062e9e5-6452-4172-b0dc-6601adcfd0b0/84113582601.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/486b58d4-0c57-4d76-890e-98c3e883b222/xemujolomalolarupumi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59949f8f-1930-4fc2-a554-5787cfd903c3/siroraluxagukufudorupofip.pdfIn PDF document text
    • https://s3.amazonaws.com/mamukawaxatali/ppap_manual_aiag.pdfIn PDF document text
    • https://s3.amazonaws.com/fujadabez/40191148697.pdfIn PDF document text
    • https://s3.amazonaws.com/wujapu/second_law_of_thermodynamics_entropy.pdfIn PDF document text
    • https://s3.amazonaws.com/vavabi/personal_pronouns_exercises_intermediate.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_off000148a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148A0 4820 bytes
SHA-256: 2e19d64df4711c744994b08829c9e90e7bdbba60e68b4968e8e9f1f5668591a6
font_01_sfnt_off00015923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15923 10272 bytes
SHA-256: b7d38668184ac8fb2d19ffeb3ff233e626461655e347df183a2e0ebd0f27ca09

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