Malicious PDF — malware analysis report

Static analysis result for SHA-256 65c524ef8bf59ca8…

MALICIOUS

PDF

42.6 KB Created: 2020-08-19 19:44:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 42c06f0813017a772699a8385221f14a SHA-1: 4656769c01b6250e87781f72bb2f82e1cdecb2ed SHA-256: 65c524ef8bf59ca8a21a994401698acc48775a781387ae8c4d74e44863162af7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a link farm designed to redirect users to malicious infrastructure, specifically disguised as job application answers. The primary malicious URL identified is https://ttraff.ru/pify?keyword=job+application+answers+for+the+questionnaire, which is likely used to distribute further malware or phishing content. The ML classifier strongly indicated maliciousness, supporting the observed redirection and link farm behavior.

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.ru/pify?keyword=job+application+answers+for+the+questionnaire
    • http://files.eoccme.com/uploads/1/3/2/3/132303269/toninizenig-zukunof-tibozokuwot-nifogukufuse.pdf
    • http://files.pittsburghaiha.org/uploads/1/3/2/3/132303035/75cd28bde029be.pdf
    • http://files.swic-denver.org/uploads/1/3/2/7/132740361/kimalu.pdf
    • http://files.jacobstubbsonline.com/uploads/1/3/1/3/131382531/xigowobigifade_zenumerox_felowoliko.pdf
    • http://files.ashlynmariephotography.com/uploads/1/3/2/8/132815924/c68dfec0d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/7922/1919/files/74537381565.pdf
    • https://cdn.shopify.com/s/files/1/0439/9559/4910/files/bowesaguf.pdf
    • https://cdn.shopify.com/s/files/1/0434/5567/6568/files/panuwi.pdf
    • https://cdn.shopify.com/s/files/1/0431/8999/3635/files/job_interview_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0430/5921/6537/files/nurudajosavadopazedafule.pdf
    • https://cdn.shopify.com/s/files/1/0430/4211/1637/files/47103583221.pdf
    • https://cdn.shopify.com/s/files/1/0430/3205/1873/files/tipanukerafanuxiwo.pdf
    • https://cdn.shopify.com/s/files/1/0432/8855/9782/files/bihar_si_question_paper_2020.pdf
    • https://cdn.shopify.com/s/files/1/0433/6821/8780/files/kofutuxafiwobanudidexade.pdf
    • https://cdn.shopify.com/s/files/1/0432/9262/2998/files/best_self_introduction_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/6343/4654/files/nigerepilorezenefowumas.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_off00006846.bin
363715f11c2b1b32e256425eebfea520995862325bb4da1214a78a59eb659f1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6846 5448 bytes
font_01_sfnt_off00007ad8.bin
1cc097311be2e145f182b0ea72729f7d8de089f270ad0d1e51f8d376a630f277		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AD8 10124 bytes

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