Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ebf67450721935b…

MALICIOUS

PDF

32.5 KB Created: 2020-10-11 00:22:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 5abae073e2139585352fcf2556ff8090 SHA-1: 850a745a94d0735a8228bf2a0069b9da4dbd64ed SHA-256: 8ebf67450721935b7f06f5c2a5319e5e26b7671091037af415ba6fa792b10e7f
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links pointing to external PDF documents hosted on disposable domains, a technique often used for SEO manipulation or to distribute further malicious content. The presence of a link to a known malicious redirector infrastructure further supports this assessment. No scripts were extracted, and the document body was heavily obfuscated, limiting deeper analysis of the immediate payload.

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://gettraff.ru/strik?keyword=no+glamour+sentence+structure In PDF document text
    • https://site-1037922.mozfiles.com/files/1037922/wozexakunisaredupu.pdfIn PDF document text
    • https://site-1039437.mozfiles.com/files/1039437/bifidigenobidibulu.pdfIn PDF document text
    • https://site-1039253.mozfiles.com/files/1039253/kalezovuxaz.pdfIn PDF document text
    • https://site-1048557.mozfiles.com/files/1048557/10162131138.pdfIn PDF document text
    • https://site-1041212.mozfiles.com/files/1041212/zakexaziparur.pdfIn PDF document text
    • http://maribina.owlwisdomhealing.com/uploads/1/3/0/8/130813077/sovosekufixega_misupisux.pdfIn PDF document text
    • http://files.coloradoartclass.org/uploads/1/3/0/7/130775780/xorovitewix-liwukajasixos-rupozepepux-mejavikukez.pdfIn PDF document text
    • http://fower.rottsofruv.com/uploads/1/3/0/7/130776485/5752743.pdfIn PDF document text
    • http://tazuxa.workofartstudios.com/uploads/1/3/1/8/131856643/742809b1b7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/465f6edc-f155-421f-9b28-d069bc3c084c/rorijofozaxamod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cff6725-66b3-42e0-8585-cf4a3fc098fc/segavodawavirukadadego.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4d44476-603e-425d-9307-b682862b7e11/garekijatesebumojisawizom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1862e78-2ecf-4ba1-8d63-c1cf737a7443/duduwojonogo.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_off00004326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4326 5088 bytes
SHA-256: 3d70ee26b2e1cf77abdbff1aba49a90f94002979f7cf96ad5866d5505aa9f8c1
font_01_sfnt_off00005465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5465 9620 bytes
SHA-256: ea2ae3dda151eb91e645003c12d24dc2da2dc4dde5713baa77ff0af654c026fc

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