Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f9c4586b85aac33…

MALICIOUS

PDF

36.3 KB Created: 2020-08-11 19:24:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 06e2632432c3da464bae7fde71d86c17 SHA-1: fef83d0338555596cf5c836dd8c3b635e023416b SHA-256: 5f9c4586b85aac33e47f7f00948eb917a805b0ed087c860a157f28d73102d009
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector at 'ttraff.com'. The document body, though heavily obfuscated, appears to reference educational material, suggesting a lure to trick users into clicking the malicious link. The ML classifier strongly indicated maliciousness, and the presence of multiple external links supports a content-farming or redirection 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.com/pify?keyword=btec+level+3+national+business+student+book+1+pdf
    • http://sefomas.str8coastin.com/uploads/1/3/1/3/131398444/0090578b.pdf
    • http://files.francisfamilyblog.com/uploads/1/3/0/7/130776370/9688007.pdf
    • http://juxun.pickeringchurch.com/uploads/1/3/0/8/130874474/1099319.pdf
    • http://roborip.fuali-barbados.com/uploads/1/3/1/6/131606060/91bd9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/8719/9394/files/wotamegona.pdf
    • https://cdn.shopify.com/s/files/1/0428/3033/2070/files/ctet_2020_notification_in_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0434/4256/9383/files/booker_t_washington_biography.pdf
    • https://cdn.shopify.com/s/files/1/0440/6181/9045/files/libros_sobre_minimalismo_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0433/6464/7077/files/75174951974.pdf
    • https://cdn.shopify.com/s/files/1/0432/3429/5966/files/20362025891.pdf
    • https://cdn.shopify.com/s/files/1/0434/4673/0904/files/chiefs_schedule_2020.pdf
    • https://cdn.shopify.com/s/files/1/0431/3779/4204/files/frame_relay_configuration_commands.pdf
    • https://cdn.shopify.com/s/files/1/0438/3119/7856/files/eighteenth_brumaire.pdf
    • https://cdn.shopify.com/s/files/1/0450/7897/0533/files/bail_pola_information_in_marathi.pdf
    • https://cdn.shopify.com/s/files/1/0428/5526/8519/files/viper_7345v_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/0228/1633/files/32547951.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_off00004e8d.bin
c2cc62316d344a0d7c9a957c2ea8daa3ceafecd93f8079cd1cfa0f6cd793e6db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E8D 5584 bytes
font_01_sfnt_off000061ac.bin
73fff09dfd9a9e804e4ecef3d315b6a22b30e2f00cdb8406e134e0d9fec71836		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61AC 10124 bytes

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