Malicious PDF — malware analysis report

Static analysis result for SHA-256 33ccacffe7e9b923…

MALICIOUS

PDF

43.6 KB Created: 2020-11-02 20:20:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 2866c2d353300c56c67134fcfa3a953a SHA-1: c11ce50df4590fdc1143a80ec5d4157591bd9302 SHA-256: 33ccacffe7e9b923ff42c0d2bd43d1f6ce70fe30c59218dbf26a8057c07edc94
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file functions as a link farm, containing numerous embedded URLs that redirect to external PDF documents. The primary malicious URL identified is 'https://gettraff.ru/aws?keyword=define+fission+reaction', which is flagged as a known malicious redirector. The document's structure and the nature of the links suggest an attempt to distribute or obscure access to other potentially malicious content, likely as part of a phishing or spam campaign.

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/aws?keyword=define+fission+reaction In PDF document text
    • https://xujaxivef.weebly.com/uploads/1/3/1/4/131438557/a81ff34d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387938/normal_5f99ab31c4622.pdfIn PDF document text
    • https://digonowokeke.weebly.com/uploads/1/3/1/8/131856318/kulow.pdfIn PDF document text
    • https://duxuborokepab.weebly.com/uploads/1/3/4/4/134449965/6173330.pdfIn PDF document text
    • https://xosotemup.weebly.com/uploads/1/3/4/3/134367608/f27d366e5a1a894.pdfIn PDF document text
    • https://rokufekajo.weebly.com/uploads/1/3/0/8/130814342/duripetum_fagidiwizenovu_xezizu_fadumo.pdfIn PDF document text
    • https://rukinedofixod.weebly.com/uploads/1/3/4/3/134348838/kataxegijaxagexuju.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/0c554379-895f-4e6c-84b7-18c964338dc1/63140696350.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8651/9195/files/orthonormal_spherical_harmonics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17d65ca5-e095-4c4d-941a-9a9977c4af45/doxefexalumulujajab.pdfIn PDF document text
    • https://s3.amazonaws.com/nagev/4096801326.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/992ccb41-59f8-4b01-b35e-d45c3049603d/wifiwigofonal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a01903f-1377-4280-9d2c-6f3c926623fe/48840746266.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_off00006a20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A20 4840 bytes
SHA-256: ac7d198df7ddc11ce8a5bc207a47d4ec70018e15724c87e7411e6d19e4ea3078
font_01_sfnt_off00007aad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7AAD 11796 bytes
SHA-256: 7f8abe11fdf977a8f30adeeb9f038daa2ac66facb795ab35e86e3617829becbe

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