Malicious PDF — malware analysis report

Static analysis result for SHA-256 6328148870d6bb8d…

MALICIOUS

PDF

49.2 KB Created: 2020-08-31 02:52:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c106ced73bbcfc24a1a362b946f3e727 SHA-1: 4d0cc9e278b57c0ab6475f514a64aeaf3fecad63 SHA-256: 6328148870d6bb8d2e1d25fb3b405bf1e71fe6605ab7e611f3e09d94485f9469
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link that redirects to a known malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to 'quiz questions and answers', likely a lure to entice clicks. The PDF also contains a large number of external links, suggesting a link farm or SEO manipulation tactic.

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/wix?keyword=quiz+questions+and+answers+2015+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_5c6cbe1d631246d2b27c5c00f0925dff.pdf
    • https://static.usrfiles.com/ugd/0d089b_6fa765ec54c941c2b296adcd6b0eab68.pdf
    • https://static.usrfiles.com/ugd/fd3290_a332fa21b3224ec7925e8974fe7a697c.pdf
    • https://cdn.shopify.com/s/files/1/0435/5004/8420/files/wedding_invitation_template_with_picture.pdf
    • https://cdn.shopify.com/s/files/1/0434/4800/8866/files/the_library_of_babel_jorge_luis_borges.pdf
    • https://cdn.shopify.com/s/files/1/0431/5856/9128/files/kokaxuvinaveveforim.pdf
    • https://cdn.shopify.com/s/files/1/0433/1828/0357/files/dark_souls_2_spells.pdf
    • https://cdn.shopify.com/s/files/1/0432/7945/0272/files/91169026544.pdf
    • https://cdn.shopify.com/s/files/1/0436/0349/3022/files/barriers_to_cross_cultural_communication.pdf
    • https://cdn.shopify.com/s/files/1/0432/0811/4340/files/80250545439.pdf
    • https://static.usrfiles.com/ugd/b8c837_75bee5003aae441fa7180ee3df48be7c.pdf
    • https://static.usrfiles.com/ugd/4b7290_880ee8aeb79649e497c3f30c8a9f0054.pdf
    • https://static.usrfiles.com/ugd/0d089b_6ad5796752954963b94eaec9632eb78b.pdf
    • https://static.usrfiles.com/ugd/3f0e57_d294af0f04074cd9b455b7be8de7f035.pdf
    • https://static.usrfiles.com/ugd/61b8bf_0530409089364c4e9d9980e63d75aef7.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006789.bin
25d6445f35e19ee9158e755793a75b92484d6a81c0357f7ff40f3e53fa08bc11		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6789 5780 bytes
font_01_sfnt_off00007b67.bin
0b4b2761e0a0f7ac738b82df86c4003542a351372526a681ce3c2e57772abc64		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B67 10192 bytes
font_02_sfnt_off00009e90.bin
4c6e61167d4c6c228aad8823441bd5dbb990b41bd1b4411b87d5d0fd606b11d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E90 17136 bytes

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