Malicious PDF — malware analysis report

Static analysis result for SHA-256 f250f4b26658e28c…

MALICIOUS

PDF

40.8 KB Created: 2020-11-05 10:15:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: f5ed5e2a952f069e68b7644dab6118ae SHA-1: 5ffc26f95157d5c36ab32eeebd10b46a37e664c1 SHA-256: f250f4b26658e28c12d0c6bd4641d581dc6ee91d3391aee872a8e66e64c0a493
162 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources, including a known malicious redirector. The document body, though heavily obfuscated, contains a URL that is also flagged as a malicious redirector. This suggests the PDF is part of a link farm or SEO poisoning campaign designed to drive traffic to malicious 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ggtraff.ru/strik?keyword=worksheet+on+rational+numbers+class+8 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4382613/normal_5f8f3f8d02ff3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373297/normal_5f8963b522a2e.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/jasadavebaga/naravolivurofovoxajal.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/88037480861.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/sutetitaxifax.pdfIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/demanda_de_amparo_indirecto_en_materia_civil.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/1570/6523/files/43226364655.pdfIn PDF document text
    • https://s3.amazonaws.com/fosalizuzu/xegekipama.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/3373/0458/files/26843020382.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/11639391041.pdfIn PDF document text
    • https://s3.amazonaws.com/jozetej/adobe_reader_offline_installer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2393df98-04ec-49e2-b628-c35f9b85b38f/gexaxuzit.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_off00005c4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C4F 5452 bytes
SHA-256: a6950fe79fcd9b6feb6324235d2cd74123277d12b73c71bfd8a3ffe4c5d322ed
font_01_sfnt_off00006eb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EB9 12024 bytes
SHA-256: 6c7bed06ce4dfddea82dbdaa379ace6b8f3925403bb34951934f8c2aa1c449ea

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