Malicious PDF — malware analysis report

Static analysis result for SHA-256 f98bf91f43ee4edd…

MALICIOUS

PDF

28.6 KB Created: 2020-10-05 17:34:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: dfdb8c113cf65cf288acdcbbc46535bd SHA-1: f299ae24988e4c8d5fa07d8737d5b2810ffb15b6 SHA-256: f98bf91f43ee4edd56f72555c8e96751ba1b76a65ad4c4a271b96c54350825f0
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with several pointing to known malicious redirectors and a PDF link farm. The ML classifier also flagged this PDF as malicious. While no scripts were directly extracted, the structure and embedded links suggest an attempt to redirect users to malicious content or facilitate SEO manipulation for potentially harmful purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.
  • 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.
  • 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://ggtraff.ru/strik?keyword=farmer+refuted+sheet+music In PDF document text
    • http://tupipok.marksatin.com/uploads/1/3/1/6/131606162/5707610.pdfIn PDF document text
    • http://pusele.5dogdigital.com/uploads/1/3/1/3/131398091/pexifeni-sabiridovabev.pdfIn PDF document text
    • http://files.pocketinstructor.co.uk/uploads/1/3/2/3/132303028/wipolizuvosog_favad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4218/4095/files/define_direct_characterization_in_poetry.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6694/8773/files/92930878112.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/9194/3331/files/vajalivazilapibukurexixo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/3928/4126/files/42247711744.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/1127/1588/files/northwest_nazarene_university_transcripts.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/2786/4993/files/digital_swr_meter_hf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/7036/9175/files/guided_reading_activity_foundations_of_government_answer_key_networks.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8746/9471/files/the_official_lsat_superprep.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/3634/7032/files/bloons_tower_defense_6_apk_mod.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_off00004492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4492 5184 bytes
SHA-256: c6adcc07ddbd515da0ef858a93f7eae41de0d37e0560aeffccad381a6587c002
font_01_sfnt_off0000560f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x560F 9788 bytes
SHA-256: acca0183bd03326e50703b0aa6c771ec8364889d7edcb4b7a6d55e3fcc14c280

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