Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d8f26ed423b613b…

MALICIOUS

PDF

45.0 KB Created: 2020-08-29 13:17:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a0a8ed58d3ea3f9cdd331cba6e7e708c SHA-1: 90afeb75df5f72737453f89c8ba16491ff66ea2f SHA-256: 5d8f26ed423b613b93761f27dffa621439e0bbc3ccb52b84e4d39c291b1ebcd1
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, identified as a link farm, pointing to external PDF documents. One of these links, 'https://ttraff.me/wix?keyword=kuther+hydro+proyecto+en+bhutan', is flagged as a malicious redirector. This suggests the document is part of a campaign to drive traffic to malicious infrastructure, likely for SEO poisoning or to distribute further malware. No scripts were extracted, but the presence of numerous links and the malicious redirector strongly indicate malicious intent.

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=kuther+hydro+proyecto+en+bhutan
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/b8c837_b0cbe733d7d940e59e53921b7a18ba7c.pdf
    • https://static.usrfiles.com/ugd/b8c837_cf155e1798dc4d58ad38a62e6c9f8df3.pdf
    • https://static.usrfiles.com/ugd/41a0b6_dddc8edfc5a7493dbbdda5832f749db9.pdf
    • https://static.usrfiles.com/ugd/d94ae5_34ee16442d104950a5d1eddfac710ae1.pdf
    • https://static.usrfiles.com/ugd/b8c837_4e7aa3bf8441449389b7bac19fd60826.pdf
    • https://static.usrfiles.com/ugd/b8c837_8fceaaa1632c40bc88331856942a8cb0.pdf
    • https://static.usrfiles.com/ugd/b8c837_7aefd942af7945398a92b6381d1191bc.pdf
    • https://static.usrfiles.com/ugd/b8c837_222e21fa17104e15808008453b568317.pdf
    • https://static.usrfiles.com/ugd/b8c837_58c0e2677d264bdfb97c9b6145d5f366.pdf
    • https://static.usrfiles.com/ugd/b8c837_8f3cfe0583d54cd0b63d2ef6556a1ace.pdf
    • https://static.usrfiles.com/ugd/b8c837_837c817a941248b3b46c4824b42c1f69.pdf
    • https://static.usrfiles.com/ugd/b8c837_8f125fccc3ae4256ac7835c55a89af43.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006275.bin
c748a423ff8e4ab6cb5f7ad30b2b0bcc7b60d9949492496121dd81ea7461971d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6275 4996 bytes
font_01_sfnt_off00007361.bin
cc1f4e878e44b1fc6a68458472005f5887f524b640d12d40728e64fac66d6eab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7361 11324 bytes
font_02_sfnt_off00009979.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9979 4324 bytes

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