Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fae1191ecfe4a94…

MALICIOUS

PDF

42.1 KB Created: 2020-08-29 01:01:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3965a8b5e1bea3f5f2388c51e8ad91eb SHA-1: f7168ae939b2737e14d243436df230c75757e005 SHA-256: 3fae1191ecfe4a947b12892490ff2f7df8979df0d29252c6993c343d35632add
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a significant number of embedded links, with one identified as a known malicious redirector. The heuristic firings indicate this is a link farm designed to distribute malicious content. The ML classifier strongly supports the malicious verdict. The document body, though heavily obfuscated, contains the primary redirect URL.

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=kubota+f1900+workshop+manual
    • https://static.usrfiles.com/ugd/b8c837_5a8c5136b98347979ff627a5ad2814d8.pdf
    • https://static.usrfiles.com/ugd/b8c837_efecfac215454b0e9be89bf658fd3c9b.pdf
    • https://static.usrfiles.com/ugd/b8c837_a712e25435b7489c98a739a81709f9b6.pdf
    • https://cdn.shopify.com/s/files/1/0430/5374/4279/files/46938076855.pdf
    • https://static.usrfiles.com/ugd/b8c837_9189c0d0b57d498f90bb808ddc05231a.pdf
    • https://static.usrfiles.com/ugd/b8c837_5c6160b6537646af81d48374e8119561.pdf
    • https://static.usrfiles.com/ugd/b8c837_3c1e5031a51b4465b08fad6661fc2646.pdf
    • https://cdn.shopify.com/s/files/1/0434/3136/2725/files/damning_report_en_francais.pdf
    • https://cdn.shopify.com/s/files/1/0430/0062/7363/files/gorugamu.pdf
    • https://cdn.shopify.com/s/files/1/0437/2401/3722/files/74406945954.pdf
    • https://cdn.shopify.com/s/files/1/0428/8885/5718/files/c_b_i_ka_full_form.pdf
    • https://cdn.shopify.com/s/files/1/0444/4202/6150/files/introduction_to_anglo_american_literature.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_off00006571.bin
9e0f8e6d5e0abd9a11016bab089d17b3a27dd6e7d051e2b20598cdb5386b31c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6571 5756 bytes
font_01_sfnt_off000078ed.bin
7f65a605b25b7bf422dfa36aef785615bb340192a73f688663e9d528d1c85bb7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78ED 10268 bytes

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