Malicious PDF — malware analysis report

Static analysis result for SHA-256 376ef3eeac26bf69…

MALICIOUS

PDF

38.1 KB Created: 2020-11-04 14:51:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: d526086094afbf8f235164b236a4319c SHA-1: 4b1c0e25bd044c4efee77ebaa8330743802308fa SHA-256: 376ef3eeac26bf69ea0b722551bc492d56c570fce526317a3bf7c9150d2242e3
224 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1204.002 Malicious Link

This PDF file contains numerous embedded links, many pointing to disposable hosting and redirector infrastructure. The primary link, disguised as a Spanish login page, leads to 'gettraff.ru', a known malicious redirector. The heuristic firings indicate this is a link farm designed to distribute malicious content or harvest credentials, and the ML classifier strongly supports its malicious nature. No scripts were extracted, but the document's structure and embedded URLs are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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=conjuguemos+spanish+login In PDF document text
    • https://sifumoxijobobo.weebly.com/uploads/1/3/4/4/134493963/f89ba113485462c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368492/normal_5f8a0674b3ccf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372681/normal_5f8b2b6a07c0b.pdfIn PDF document text
    • https://biwefixosepow.weebly.com/uploads/1/3/4/3/134334309/6748b587342858e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380539/normal_5f961b722b0ac.pdfIn PDF document text
    • https://wexegupewafux.weebly.com/uploads/1/3/4/4/134443826/ripakamoraz-kitewi.pdfIn PDF document text
    • https://senobatupubem.weebly.com/uploads/1/3/1/4/131437889/5426e0baf5.pdfIn PDF document text
    • https://vopevejefed.weebly.com/uploads/1/3/1/6/131606133/romotuwizuf.pdfIn PDF document text
    • https://nasefowiwawenug.weebly.com/uploads/1/3/4/1/134109082/855081b9.pdfIn PDF document text
    • https://nirawulef.weebly.com/uploads/1/3/4/3/134324477/324e9d83b6a55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393016/normal_5f8e803053b9a.pdfIn PDF document text
    • https://tavikumor.weebly.com/uploads/1/3/4/4/134476146/fadolaninoxuxeg.pdfIn PDF document text
    • https://winimotewo.weebly.com/uploads/1/3/4/5/134593518/jinow_kurosobidal_jagowijijafan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393916/normal_5f967b9121dc2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/subud/reading_book_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/fovezewi/algebraic_notation_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/encyclopedia_britannica_download.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_off0000535f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x535F 5116 bytes
SHA-256: 09c2bd021d65e94bd980bba774b3c0a69b36f5934b45871d56040f66c7caedb8
font_01_sfnt_off000064a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64A8 12128 bytes
SHA-256: 9b0508ac6d80d35925095f52685f035d7e3d36b0292c509b8b8d02d0231e8bba

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