Malicious PDF — malware analysis report

Static analysis result for SHA-256 82c699acd1d48065…

MALICIOUS

PDF

42.3 KB Created: 2020-09-03 04:15:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ae95cbd968e8ca72868863382009cfda SHA-1: cf67b4afc0c650fb19f24c76a66d17937598bbef SHA-256: 82c699acd1d480654cc4f6e72677988a5e5be5aad94177887558ac3895b7841b
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.ru/wix?keyword=kabel+light+font+free++mac'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, one of which is to 'https://static.usrfiles.com/ugd/4d6844_f5d9bce2c23749a3b0559fa7968a191e.pdf'. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily corrupted, contains the same malicious URL, suggesting an attempt to lure the user to a potentially harmful site.

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=kabel+light+font+free++mac
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/4d6844_f5d9bce2c23749a3b0559fa7968a191e.pdf
    • https://static.usrfiles.com/ugd/b8c837_607cf5f478734dbaa885c6cc1aadfda5.pdf
    • https://static.usrfiles.com/ugd/338562_5f8f4e00e31540b2bae06aeea700cbf9.pdf
    • https://static.usrfiles.com/ugd/b8c837_78f7a6f0881a4487a911c0985caa0178.pdf
    • https://static.usrfiles.com/ugd/1acd69_4c8cbf106b6546ea842fb687cc7aaaea.pdf
    • https://static.usrfiles.com/ugd/b8c837_f5fd8d2710d742f08e6d2a715e8ebe5e.pdf
    • https://static.usrfiles.com/ugd/217d68_7bfe656970c749ebbb5d332d9620ec33.pdf
    • https://static.usrfiles.com/ugd/b8c837_40fac45572904770b6423b61e4f8c578.pdf
    • https://cdn.shopify.com/s/files/1/0428/2214/0070/files/apa_machine.pdf
    • https://cdn.shopify.com/s/files/1/0429/7038/2490/files/19596884345.pdf
    • https://cdn.shopify.com/s/files/1/0434/2926/5564/files/agricultural_systems_of_the_world.pdf
    • https://cdn.shopify.com/s/files/1/0428/2961/1171/files/11377076852.pdf
    • https://static.usrfiles.com/ugd/b8c837_aad9bfa8932b404c8e8472955442502f.pdf
    • https://static.usrfiles.com/ugd/ad2ade_49cbc2e9f2ab4eae8bd3ebc8607127ec.pdf
    • https://static.usrfiles.com/ugd/120f26_c2c0ba54fff84ab785b815c1f6b0c116.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_off00004e5c.bin
52ebc64b001f82e4287c25054f9286f6fbc83d579a889b7f8f793f39405d7aa7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E5C 5012 bytes
font_01_sfnt_off00005f3b.bin
5fa614f0ea6944350622a9222ccb1f54db97c8fb719b0c522ca0d901d8ead113		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F3B 15040 bytes
font_02_sfnt_off00008e10.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E10 4324 bytes

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