Malicious PDF — malware analysis report

Static analysis result for SHA-256 6eb786ff1b37ad94…

MALICIOUS

PDF

39.1 KB Created: 2020-08-22 10:16:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f723701546d28a7114104e631bde655b SHA-1: 15e422059613c9e7ae4919a63ade94cf5170d157 SHA-256: 6eb786ff1b37ad94017f85e01ff2d189d66c6b29e2b4462af3af81c452c41021
154 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to potentially malicious redirectors, disguised as a link farm for academic documents. The ML classifier strongly indicated maliciousness, and the presence of a redirector URL suggests an attempt to lead the user to a malicious site. No scripts were extracted, but the overall structure and link farm indicate a phishing or redirection attempt.

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://ttraff.cc/pify?keyword=clinical+examination+of+farm+animals+free
    • http://zowuxanag.beautyindiversity.org/uploads/1/3/2/3/132303027/7424224.pdf
    • http://sedes.burritoprincess.com/uploads/1/3/0/7/130776065/da52bd3d8e831e.pdf
    • http://files.spiritfire.com/uploads/1/3/0/7/130775375/caf5e.pdf
    • http://kebutot.bodywisdommelaniepalm.com/uploads/1/3/2/3/132303195/2813673.pdf
    • http://bizelevad.walnutgroveauction.com/uploads/1/3/1/8/131856158/xeledujuxafa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/6518/0314/files/49616752016.pdf
    • https://cdn.shopify.com/s/files/1/0435/8917/3411/files/ib_biology_syllabus.pdf
    • https://cdn.shopify.com/s/files/1/0434/9024/6822/files/bsf_head_constable_ro_rm_previous_year_question_paper.pdf
    • https://cdn.shopify.com/s/files/1/0432/4248/7972/files/dukomebip.pdf
    • https://cdn.shopify.com/s/files/1/0433/7690/2309/files/administrative_position_interview_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0440/0644/1110/files/network_traffic_monitoring_tools.pdf
    • https://cdn.shopify.com/s/files/1/0437/2040/9256/files/colliers_houston_office_market_report.pdf
    • https://cdn.shopify.com/s/files/1/0434/0842/5123/files/96775017858.pdf
    • https://cdn.shopify.com/s/files/1/0427/7154/6279/files/83241162596.pdf
    • https://cdn.shopify.com/s/files/1/0440/9743/7848/files/xijaxaj.pdf
    • https://cdn.shopify.com/s/files/1/0433/3908/8022/files/teaching_about_the_holy_spirit.pdf
    • https://cdn.shopify.com/s/files/1/0448/4002/6273/files/certified_scrum_master_practice_test.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ccd.bin
f4ff05e873bd621a2624e0e2c4d6a6b04652b087347e73af8bd8054fbe8d7378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CCD 5000 bytes
font_01_sfnt_off00006db1.bin
556bbcb076b7e66cebcd2818d1be4ba42c5fbf1f41ea54b89aa81ac145829668		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DB1 9888 bytes

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