Malicious PDF — malware analysis report

Static analysis result for SHA-256 9df4507bf9da9d05…

MALICIOUS

PDF

42.3 KB Created: 2020-08-10 05:56:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e37f94ec1a8c32c50f65a6db270e5fb2 SHA-1: 6778cf70631fe2d83efb031caea35540d17b448e SHA-256: 9df4507bf9da9d05ab4334694caa7ed2d5cbac83963b6359b1996a54b8610048
154 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, identified as a link farm, that redirect to a known malicious domain. The primary malicious URL observed is https://ttraff.ru/pify?keyword=functional+organisational+structure+advantages+and+disadvantages+pdf. While no scripts were directly extracted, the PDF structure and embedded links strongly suggest an attempt to redirect the user to malicious content, likely 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/pify?keyword=functional+organisational+structure+advantages+and+disadvantages+pdf In PDF document text
    • http://files.amyandrewsmusic.com/uploads/1/3/1/3/131381881/6697624.pdfIn PDF document text
    • http://files.chloeadlerteaching.com/uploads/1/3/0/7/130775400/sarazasogu_vasadogalu_banedegobeninu_virowejo.pdfIn PDF document text
    • http://files.impact2020conference.com/uploads/1/3/1/1/131164011/9ddd0852d67.pdfIn PDF document text
    • http://files.lovebugweddingcars.co.uk/uploads/1/3/1/8/131871814/cde6f3f61.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6589/2245/files/kedoxiwo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1804/4070/files/pumafuxumewiva.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7650/9080/files/56197133772.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8345/4872/files/zuwejajonojebujovedo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9925/0081/files/vorigoripinazisimijemevu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1898/5370/files/ashrae_2020_handbook_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6861/1998/files/xupurerod.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/571475918.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6843/2288/files/11866011195.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5305/6149/files/9956484644.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6976/7842/files/66458591599.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0476/4068/files/18546356067.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3074/8055/files/mapa_alsacia_y_selva_negra.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6037/9286/files/85463009874.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_off000066f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66F6 5340 bytes
SHA-256: 4e50621ac8a2112f5c1016dbca407cc6a6ca931f0ea3b4d31df17ef1f7b0ddee
font_01_sfnt_off0000793a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x793A 10096 bytes
SHA-256: 204b557dd5affca867d15d009feab13ecbe0545075f05996c9f5457508c97834

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