Malicious PDF — malware analysis report

Static analysis result for SHA-256 8262cfeac7750fbc…

MALICIOUS

PDF

40.7 KB Created: 2020-08-29 20:56:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 207e409283aa9bddbeb0d5cd8a620337 SHA-1: 4798b4dd285ae05480ec4c1964d86debefe1e45e SHA-256: 8262cfeac7750fbcdb4fdc3f884397b5c07cc7a03fbfe1efc93fc0097be15216
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link pointing to 'https://ttraff.ru/wix?keyword=pdfsharp.dll+free+download', which is designed to trick users into downloading a file. The document body and embedded URLs further support this by listing download-related keywords and numerous links to external PDF files, suggesting a link farm or SEO poisoning tactic. The ML classifier also strongly indicated maliciousness.

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=pdfsharp.dll+free+download
    • https://static.usrfiles.com/ugd/b8c837_d2a1fcf02e7b413fa64c9be161872fc0.pdf
    • https://static.usrfiles.com/ugd/b7082a_296b2fb2bb5e496baaa37abae07fc8d8.pdf
    • https://static.usrfiles.com/ugd/80c1db_4a2555da871b49ad913e4e3a82a85cf9.pdf
    • https://static.usrfiles.com/ugd/b8c837_b00186e802c0484eacef5c9b6c867c7a.pdf
    • https://static.usrfiles.com/ugd/2f3ac6_42b04b49bdf9464fad63c811393cade0.pdf
    • https://static.usrfiles.com/ugd/dc98cc_12f96e1955d344b5a1be54370b22b5f2.pdf
    • https://static.usrfiles.com/ugd/7ff653_e4e086a04ef44cc29504a91f98027013.pdf
    • https://static.usrfiles.com/ugd/0789d5_f2f992a627514e4db27640f54aa02351.pdf
    • https://static.usrfiles.com/ugd/b8c837_3965226ac8f9493e9a7333be8078ceb5.pdf
    • https://static.usrfiles.com/ugd/b8c837_6b9ad6154ea942eb84d4c9504572666f.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_off000060cf.bin
13c87ea0b9c9b6f92b755d26e9084fcb1f1eafd1108bccb99c246f65b833223e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60CF 5256 bytes
font_01_sfnt_off000072bd.bin
f68a17d3854cd12a362b025a13387745b84a2e77d574f36f5ff30616b10eee7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72BD 10432 bytes

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