Malicious PDF — malware analysis report

Static analysis result for SHA-256 7757e8f33d64dcfd…

MALICIOUS

PDF

60.9 KB Created: 2020-08-12 09:17:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3388414b7e09944c392f32a24ea7b26b SHA-1: e87e2beb9633920ec1cda0af27071596d299828c SHA-256: 7757e8f33d64dcfde4a6490c0b84657511f7062d18e334243430a47aaf0f2910
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying it as a malicious redirector link pointing to 'https://ttraff.ru/wb?keyword=antecedentes%20de%20la%20salud%20mental%20en%20el%20peru%20pdf'. This suggests the document is part of a link farm or SEO manipulation scheme, likely intended to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious intent, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://ttraff.ru/wb?keyword=antecedentes%20de%20la%20salud%20mental%20en%20el%20peru%20pdf
    • http://files.nmakzoo.org/uploads/1/3/1/3/131381900/6261918.pdf
    • http://files.claraceciliaatkins.com/uploads/1/3/0/9/130969148/cbf7a3baf83c.pdf
    • http://purobobim.jbconsultingandpsychology.com/uploads/1/3/1/4/131437508/vidixajimu-wimexaz.pdf
    • http://files.viyanca.com/uploads/1/3/1/3/131398221/fiderijafafogo_wokepetur_xarisipole.pdf
    • http://xabitaba.aaronjonesart.com/uploads/1/3/0/7/130738731/pivagiku.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/9459/8047/files/12814430311.pdf
    • https://cdn.shopify.com/s/files/1/0446/9365/1610/files/dinamalar_calendar_2020_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0439/0522/0776/files/sibesoxudakekiwa.pdf
    • https://cdn.shopify.com/s/files/1/0436/8944/3493/files/ampli_operationnel.pdf
    • https://cdn.shopify.com/s/files/1/0434/6085/3920/files/78959144665.pdf
    • https://cdn.shopify.com/s/files/1/0429/9623/6447/files/64647361000.pdf
    • https://cdn.shopify.com/s/files/1/0428/9894/8255/files/wonulimijo.pdf
    • https://cdn.shopify.com/s/files/1/0428/3321/5644/files/penewabebesiguronuxotap.pdf
    • https://cdn.shopify.com/s/files/1/0430/6305/0394/files/10_floor_office_building_network_design.pdf
    • https://cdn.shopify.com/s/files/1/0444/2878/7879/files/62912674918.pdf
    • https://cdn.shopify.com/s/files/1/0434/7723/7920/files/40321138522.pdf
    • https://cdn.shopify.com/s/files/1/0429/0645/2131/files/56741444475.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b057.bin
df2b008b72644d53b1eb44456ead2365c66bae83c5d164460e76e67978b2f226		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB057 5288 bytes
font_01_sfnt_off0000c23c.bin
81c0cffc14a4b45e58a5dcc28a8b82e8f464569f6d1090ea818ab8ed26b9f594		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC23C 10592 bytes

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