Malicious PDF — malware analysis report

Static analysis result for SHA-256 a96488a8da568429…

MALICIOUS

PDF

40.9 KB Created: 2020-10-02 03:14:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: c8435d3881ba12341552cf04595183ad SHA-1: e9a18d50f6775cf920725af0851c5feb73c27fa9 SHA-256: a96488a8da5684290524bed280995834d69e8b71a5094554007ee59ad7064602
184 Risk Score

Malware Insights

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

This PDF document functions as a link farm, containing numerous URLs pointing to various websites. One prominent URL, 'https://cctraff.ru/pify?keyword=honda+crv+seat+covers+2019', is identified as a malicious redirector. The document's structure and the presence of multiple links suggest an attempt to drive traffic to potentially harmful sites, likely for phishing or malware distribution. The ML classifier strongly supports the malicious nature of this PDF.

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/pify?keyword=honda+crv+seat+covers+2019 In PDF document text
    • http://pemet.potomacusa.com/uploads/1/3/1/4/131453565/wujojijuvakuji.pdfIn PDF document text
    • http://files.rockphenoms.com/uploads/1/3/0/7/130739039/6794770.pdfIn PDF document text
    • http://zovudixu.tedwinslow.com/uploads/1/3/2/7/132712207/jegipovezekome.pdfIn PDF document text
    • http://files.sciguy2012.com/uploads/1/3/0/7/130738701/3058455.pdfIn PDF document text
    • http://files.storkboxdelivery.com/uploads/1/3/1/8/131871692/fepiwuvolevel-zofefulixofap-vevanibej-walonegozufepar.pdfIn PDF document text
    • http://files.stfrancisabilene.com/uploads/1/3/1/4/131409677/kiditiredosekodofa.pdfIn PDF document text
    • http://raboka.markdeweyresearchcenter.org/uploads/1/3/1/6/131636725/gorububodazebedegip.pdfIn PDF document text
    • http://files.jpsushi.us/uploads/1/3/1/6/131636629/5283745.pdfIn PDF document text
    • http://votemiru.mvmahalo.com/uploads/1/3/0/8/130814408/979934.pdfIn PDF document text
    • http://files.pilatesexcellence.com/uploads/1/3/1/8/131856039/44a98.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/19f3aca4-0ee1-4736-8d97-c90a16b13e6f/mefugarewokofatugi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/342dd374-adba-419c-8bc5-9df2509e3df6/37604684787.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb738e33-3304-46c2-ad83-be958d81e0c1/tozuwa.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_off00006092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6092 5404 bytes
SHA-256: c196e77cf85d561fa2f830cd6f6f4ee5bf8df5bcd491ca20152554262e5df25f
font_01_sfnt_off00007300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7300 10508 bytes
SHA-256: 8bf6e48651685d60037303bd01ac9d657b32db8892f9b8896548f11079847c5b

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