Malicious PDF — malware analysis report

Static analysis result for SHA-256 15fcab118db5f845…

MALICIOUS

PDF

34.6 KB Created: 2020-11-02 08:56:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: fdd8a3012c3a87eb26be60df0da04a43 SHA-1: af258fd13d776f307f28ae79992ce4d669c93571 SHA-256: 15fcab118db5f845981f004f27ea8e887373ef1ba215660e19151e90f8f1527a
154 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 are structured to appear as search results or SEO-optimized content, with a primary malicious redirector link to 'https://ttraff.ru/123?keyword=naruto+shippuden+torrent'. The ML classifier strongly indicated maliciousness, and the heuristic firings confirm the presence of malicious redirector links and a link farm. The document body, though heavily obfuscated, contains the malicious URL and other PDF links.

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=naruto+shippuden+torrent In PDF document text
    • https://cdn-cms.f-static.net/uploads/4383794/normal_5f90d1ab5a702.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405930/normal_5f9b53f797796.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/wonoti/lesofoliruzadefige.pdfIn PDF document text
    • https://s3.amazonaws.com/penefelomiju/8_point_compass_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/8726/4451/files/circulo_unitario_ejercicios.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/1395/3447/files/44522063885.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/ansys_spaceclaim_direct_modeler_tutorial.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0505/0371/2923/files/favidovixonabekinuzam.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/7718/7781/files/ripimiligalatuzuk.pdfIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/azkar_al_nawm.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8606/2778/files/pumar.pdfIn PDF document text
    • https://s3.amazonaws.com/resixexi/41031504095.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/3998/9141/files/26304651809.pdfIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/44579606227.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/8387/2453/files/yiruma_chaconne_sheet_music.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_off00004960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4960 4984 bytes
SHA-256: 060cc34cfda7a168acb769044c4d150075f8c85b48b07c9da60931c862ab0cb3
font_01_sfnt_off00005a52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A52 10276 bytes
SHA-256: 6aa2c8fe50935f80db4caf9e33c3564df2bdc3fad614ed6087df7d05c752b5c4

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