Malicious PDF — malware analysis report

Static analysis result for SHA-256 498c89d152aab525…

MALICIOUS

PDF

45.4 KB Created: 2020-10-30 09:10:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 8630b6f414511cc2ddd45e7d4d627894 SHA-1: a082924163cee5a4aceef52878440b0e04eedebb SHA-256: 498c89d152aab525bde8e28a3da059b37b58a8b29f6c9aa7075455909d092f6c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF documents, suggesting a link farm for SEO manipulation or to obscure malicious redirects. One of the primary links, 'https://ttraff.ru/123?keyword=mary+ann+pesce+choate', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains this URL and other PDF links, reinforcing the link farm and redirector attack pattern.

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/123?keyword=mary+ann+pesce+choate In PDF document text
    • https://cdn-cms.f-static.net/uploads/4386079/normal_5f904beebb6f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366050/normal_5f870a436aa34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403421/normal_5f92c721bff20.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tometubufimopim/zunigumiduxumewuj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/0402/4740/files/21124966897.pdfIn PDF document text
    • https://s3.amazonaws.com/nitajosasa/buruvopuvarovikofojigo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/9155/6031/files/android_device_manager_imei.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/8781/3539/files/tadakerudupurikuzaragas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/8203/8430/files/98908093155.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a296f6cc-d6cf-4270-8a85-da0e1a050f9d/accounting_principles_volume_1_7th_canadian_edition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5144/1560/files/risexiwojez.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3314/0127/files/98831410326.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9192/8249/files/22483116960.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_off000071c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71C2 5096 bytes
SHA-256: 1c5d44605d5f29fd209b977b278db691cc4d21a20561affc3cb20bfa4e0f12c2
font_01_sfnt_off00008326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8326 11272 bytes
SHA-256: fbed90624baade7bc5721d83de4edce3a990659ac24a8d26758f8e49d8737728

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