Malicious PDF — malware analysis report

Static analysis result for SHA-256 f94a7393cbc21250…

MALICIOUS

PDF

43.4 KB Created: 2020-09-03 23:37:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e7a73efb7aa9e6eb230feae771d6e2e1 SHA-1: c7318e2ad8a963dc2912581f3bfa2cd42b249781 SHA-256: f94a7393cbc21250f3bb1f6fba6f53024ddc611f4cd621fee61f4ffb62699e50
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a prominent link disguised as 'Fema ics 100 b questions and answers'. This link, 'https://ttraff.me/wix?keyword=fema+ics+100+b+questions+and+answers', is flagged as a malicious redirector. The document also exhibits characteristics of a PDF link farm, with numerous embedded URLs pointing to external PDF files, likely for SEO manipulation or to host further malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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.me/wix?keyword=fema+ics+100+b+questions+and+answers
    • https://static.usrfiles.com/ugd/01e791_032bb1f74c904792a5189de9a8e7b64b.pdf
    • https://static.usrfiles.com/ugd/d5415a_8ff1a747e44f42e49a1071603d00c952.pdf
    • https://static.usrfiles.com/ugd/2b3f46_a8b5830079bf43ec8bd2edcf0a4cab31.pdf
    • https://static.usrfiles.com/ugd/824332_cf8738505c5a488a9809eca191a1962d.pdf
    • https://static.usrfiles.com/ugd/b8c837_c79df8530f58410ab29620deeff8cf9f.pdf
    • https://static.usrfiles.com/ugd/2f8cea_dd529f95c14f41c2b1554deed67d3a18.pdf
    • https://cdn.shopify.com/s/files/1/0436/6820/9817/files/slavery_by_another_name_answers.pdf
    • https://cdn.shopify.com/s/files/1/0439/3297/5272/files/sekedipivikokigogegokala.pdf
    • https://static.usrfiles.com/ugd/d54300_cc41dd83022f4d959734c194e4db7b8b.pdf
    • https://static.usrfiles.com/ugd/7d21c0_0b52d55602de4199ab4a6c38461e0029.pdf
    • https://static.usrfiles.com/ugd/29c71c_62690b45fbbe4e138c05ece0542a565d.pdf
    • https://static.usrfiles.com/ugd/3615fb_eb5b0c3f8c184e11aee2d50fe5631162.pdf
    • https://static.usrfiles.com/ugd/b8c837_891e1e417a1c4325ab2beba557355967.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b58.bin
42537b285f0b88d27d196255254e294d696d0eae95824fe6d79a737eea73df9f
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B58 5560 bytes
font_01_sfnt_off00007e30.bin
77e562f21af977e83c3a770da8267cac8edc5fff103fb8bf629d27db54842c8f
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E30 10176 bytes