Malicious PDF — malware analysis report

Static analysis result for SHA-256 2438901a49454f08…

MALICIOUS

PDF

46.7 KB Created: 2020-10-10 09:09:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 853fb70d926151b13b10673b57d44c96 SHA-1: fab23a7ca9052ff9984940e6c211c3235491d601 SHA-256: 2438901a49454f088cec02b388bff8db32cbcd1607fe6b98d1039b42aab2aedc
184 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a link farm, embedding a large number of external links, with several pointing to known malicious redirector infrastructure. The ML classifier strongly indicated maliciousness. The document's primary function appears to be directing users to potentially harmful websites, as evidenced by the embedded URLs and the PDF_SEO_LINK_FARM heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://cctraff.ru/strik?keyword=on+3+turbo+kit+f150 In PDF document text
    • http://wubopekuw.ldcustoms.com/uploads/1/3/0/7/130776492/napimibolu.pdfIn PDF document text
    • http://files.teloshospitality.com/uploads/1/3/1/0/131070481/punetuxe-dobujewibedap.pdfIn PDF document text
    • http://kedimit.themagicalway.com/uploads/1/3/0/7/130775443/xozijoni.pdfIn PDF document text
    • http://mizim.leahchang.ca/uploads/1/3/2/3/132303052/bivasuk-febuw-dunedabu-pupoxi.pdfIn PDF document text
    • http://wogoban.organicnaturopathicservices.com/uploads/1/3/0/7/130739278/sifaguguzisax-vewopor-nafunoluluxoxe.pdfIn PDF document text
    • http://kexevarep.drbonniesocket.com/uploads/1/3/2/6/132681579/4010892.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/1/0436/6496/5782/files/37067688083.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2092/7655/files/bionatrol_keto_burn_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a293ac68-9d3a-46c0-88d9-39a532286c73/xoginakixetedudurubesoku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/970aa8e2-66ae-4436-9ff6-ee9a9dcca98d/wuxiredobumoludawiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e53e5f4-067b-441f-9cbb-e7d3ee19211d/toporulomubavesubudi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c63ffda-e29c-4ef7-8557-7e0056b9bf29/92247343612.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b847add-1361-4773-b8e7-45f7a839fafa/zefomuxevegozobebev.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In 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_off0000787c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x787C 5056 bytes
SHA-256: 08b33d2bcc236410ca64459e170e59a526fc02e28e02968a0b6238a8da6a36c0
font_01_sfnt_off000089d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89D1 10620 bytes
SHA-256: 45ba5aa57eb29352011f52a0ca368b9e333729f67f29a786a62a8e4a78c6b4a4

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