Malicious PDF — malware analysis report

Static analysis result for SHA-256 96f361c7acc03604…

MALICIOUS

PDF

41.3 KB Created: 2020-11-02 06:21:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 82b67a26432334a54e5e29bc3b70ecd0 SHA-1: 884282aed6861a697d778594bad242495a80265b SHA-256: 96f361c7acc036043d6f22f95a490fc38116ef35a3c04b8cc15c3cc506983a8d
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded links pointing to external PDF files, many hosted on disposable domains. One URL, 'https://gettraff.ru/123?keyword=ram+rumble+bee+forums', is identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. This suggests the document is part of a link farm or SEO spam operation, potentially designed to distribute malware or lead users to phishing sites.

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/123?keyword=ram+rumble+bee+forums In PDF document text
    • https://xilorufanil.weebly.com/uploads/1/3/0/7/130739938/xifizus.pdfIn PDF document text
    • https://mufalugibesenu.weebly.com/uploads/1/3/1/4/131453255/gibowadikufut.pdfIn PDF document text
    • https://lesofetu.weebly.com/uploads/1/3/1/3/131378838/rubemawowegu.pdfIn PDF document text
    • https://garigewofunem.weebly.com/uploads/1/3/4/3/134314314/8c920359ea5ca9.pdfIn PDF document text
    • https://leruzifu.weebly.com/uploads/1/3/2/3/132302941/dexewobafux.pdfIn PDF document text
    • https://vuwakoge.weebly.com/uploads/1/3/4/3/134368269/kutajug.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/33200a1b-308d-4327-b54a-e24ce5fe153e/new_hampshire_exports.pdfIn PDF document text
    • https://s3.amazonaws.com/nilititonawafim/58094363747.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/9877/1097/files/51424258901.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_off00006060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6060 5060 bytes
SHA-256: 6239a8798e056c0955138c105657c6c1a883d3d3377fefe2e413fc8437bb0a86
font_01_sfnt_off00007182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7182 11668 bytes
SHA-256: d4d131a97d353c11d928633eedb80c038dae81ae1955f108474a7c78a165f568

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