Malicious PDF — malware analysis report

Static analysis result for SHA-256 c690d8cefce4c663…

MALICIOUS

PDF

41.9 KB Created: 2020-10-29 18:30:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a091bc37f1e15e64df4b93c825377d3c SHA-1: 7089a3cfc265e5c30ce0d6b2148a82abc9e508c7 SHA-256: c690d8cefce4c663cd1b39bf4fb9e3b9298e6819fef82083c0bc639ecdc0b92b
154 Risk Score

Malware Insights

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

The PDF document contains a mass of external links, masquerading as a guide to Google Docs margins, with the primary link directing to malicious redirector infrastructure. The ML classifier strongly indicated maliciousness, and the presence of numerous PDF links suggests a link farm or SEO poisoning attempt. No scripts were extracted, but the embedded links are the primary vector for malicious redirection.

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://gettraff.ru/aws?keyword=how+to+change+margins+in+google+docs+mobile
    • https://cdn-cms.f-static.net/uploads/4369768/normal_5f89083105d6f.pdf
    • https://vilukenuxe.weebly.com/uploads/1/3/2/8/132814007/wuduzomadanomom_takezezonepoxi.pdf
    • https://xogexemufak.weebly.com/uploads/1/3/1/4/131437987/mowuruzovem_rasij_lakupako_madikomojuzom.pdf
    • https://cdn-cms.f-static.net/uploads/4365580/normal_5f8ff8d547265.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0499/1860/7521/files/maths_formula_class_12.pdf
    • https://cdn.shopify.com/s/files/1/0497/8314/4599/files/definition_of_qualitative_data_analysis.pdf
    • https://uploads.strikinglycdn.com/files/1e72467b-b988-4cc7-86c9-5d40a65e2fb3/puwavabudixavokozul.pdf
    • https://uploads.strikinglycdn.com/files/e768b75f-ad8c-40c3-b9cd-1da52c58aff0/9493498801.pdf
    • https://uploads.strikinglycdn.com/files/d68082b4-fdc8-451e-9d3b-46a0112b5b3f/25221295169.pdf
    • https://s3.amazonaws.com/sugaguxagu/tuximewojabedafojivarofi.pdf
    • https://uploads.strikinglycdn.com/files/2e815d39-cb7e-4477-bb28-3313a44382e9/68953518117.pdf
    • https://uploads.strikinglycdn.com/files/eaf14e1e-11d8-45a2-bed5-f8cc437fab9b/pupiv.pdf
    • https://cdn.shopify.com/s/files/1/0497/8366/8903/files/skyvpn_pktmm_apk_download.pdf
    • https://cdn.shopify.com/s/files/1/0506/6047/5030/files/microsoft_2020_calendar_template_word.pdf
    • https://cdn.shopify.com/s/files/1/0434/0508/2780/files/fighter_factory_para_android.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_off000063b3.bin
f6e30d8396c5b806706e109a863019e3c26d11fb276e784aed941ecd3020f9f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63B3 5544 bytes
font_01_sfnt_off0000766f.bin
f9c7531575803f0fc71f41fbfda522b33d164233ea5e6d9fc3f0cbe4108dd8e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x766F 10724 bytes

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