Malicious PDF — malware analysis report

Static analysis result for SHA-256 92ce5ffeed791e75…

MALICIOUS

PDF

32.0 KB Created: 2020-10-28 03:36:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7c2cfb1e10c4b6879b4f7e18494dfe22 SHA-1: b690fc66bb5fb6b3b9aad72246c79034dbc5394c SHA-256: 92ce5ffeed791e75dbab3683cd2f813215397951fab472961ae280152668a793
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector URL. The document body, though heavily obfuscated, contains a URL that appears to be the primary lure. The presence of numerous links suggests an attempt to create a link farm or to distribute malicious content through seemingly legitimate academic resources. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://gettraff.ru/strik?keyword=international+journal+of+strategic+communication
    • https://cdn-cms.f-static.net/uploads/4373008/normal_5f98a9bd4230f.pdf
    • https://cdn-cms.f-static.net/uploads/4366009/normal_5f8760cc58c6b.pdf
    • https://cdn-cms.f-static.net/uploads/4383925/normal_5f91cbee503a1.pdf
    • https://cdn-cms.f-static.net/uploads/4370299/normal_5f89153796403.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/rupatojuko/attachment_styles_test.pdf
    • https://s3.amazonaws.com/wumodukubaru/39423944751.pdf
    • https://s3.amazonaws.com/luxelula/sixulipaxepibodozilazo.pdf
    • https://cdn.shopify.com/s/files/1/0485/0155/5355/files/55758301262.pdf
    • https://cdn.shopify.com/s/files/1/0483/0121/1809/files/alices_adventures_in_wonderland_sparknotes.pdf
    • https://cdn.shopify.com/s/files/1/0431/3497/6149/files/sniper_3d_hack_apk_for_ios.pdf
    • https://uploads.strikinglycdn.com/files/da27c6d0-1cd3-4245-8508-c181ecc4f125/mevipapoli.pdf
    • https://uploads.strikinglycdn.com/files/7deb8cc1-62f2-46b9-be89-60a4d54824fc/paferomoxodi.pdf
    • https://uploads.strikinglycdn.com/files/b1112dab-0f1d-4e29-83eb-ed77a31ab0dc/87338955081.pdf
    • https://uploads.strikinglycdn.com/files/c5b33403-e715-438e-a7a2-eb6542b6eed1/99586506771.pdf
    • https://s3.amazonaws.com/tevigotu/autobiography_of_ben_franklin.pdf
    • https://s3.amazonaws.com/felasorarabipis/29727035194.pdf
    • https://s3.amazonaws.com/vabedafozo/building_grammar_skills_for_toefl_ibt_answer_key.pdf
    • https://s3.amazonaws.com/putelekireza/giroxonisu.pdf
    • https://s3.amazonaws.com/henghuili-files/gagezuzekodanimogezej.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006f53.bin
d8968a09577883c425d3649467173dfbf0c21006135ac266f35f3143b93c0ae8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F53 5212 bytes

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