Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6e3e9c99d3c4598…

MALICIOUS

PDF

45.5 KB Created: 2020-09-01 04:38:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d4aca8a50969a01ab976954c85b87b39 SHA-1: a79bd66ef7078e0941c8697019de245454ad676c SHA-256: b6e3e9c99d3c4598a27dcfb9c8bbf3f5ea56e9ffd152d8abb624f00990323316
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.ru'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, many hosted on Shopify and static.usrfiles.com. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains the malicious URL and references to other PDFs, suggesting a lure or redirection mechanism.

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=adf.+ly+skipper
    • https://cdn.shopify.com/s/files/1/0438/0730/9984/files/78200323498.pdf
    • https://cdn.shopify.com/s/files/1/0435/2756/9576/files/tosixumenidiva.pdf
    • https://cdn.shopify.com/s/files/1/0433/6238/6079/files/33609320572.pdf
    • https://cdn.shopify.com/s/files/1/0435/2416/1704/files/jovev.pdf
    • https://cdn.shopify.com/s/files/1/0448/8301/7895/files/accounts_payable_procedures.pdf
    • https://static.usrfiles.com/ugd/73cb9e_c4c135b2b2ce4ec2b2f7f7f6ac23da78.pdf
    • https://static.usrfiles.com/ugd/b916f4_6cc6d04f0ce245b6be9c2e672bf5b3bd.pdf
    • https://static.usrfiles.com/ugd/de65f7_bbaec988ce7e4ddd94ad6c76bcf7c4db.pdf
    • https://static.usrfiles.com/ugd/b8c837_f227c3244df544bd9bb2b3da61f43bb5.pdf
    • https://static.usrfiles.com/ugd/d43733_98b8324b59074e5a9304d431b8da1c81.pdf
    • https://static.usrfiles.com/ugd/b8c837_d5708ec81aa04e80abf8143ce2ac87a4.pdf
    • https://static.usrfiles.com/ugd/6cf392_f9aaf807df8b4c2ea080ae59cbb5d3b3.pdf
    • https://static.usrfiles.com/ugd/cbe7f7_4f8c9dc16d3546f9b510cb4554493219.pdf
    • https://static.usrfiles.com/ugd/c4ccc4_11668e34297345ee9fd48fd431776df5.pdf
    • https://static.usrfiles.com/ugd/b8c837_0048c07d6de746819895bb2a129e6ea6.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000055a2.bin
c8811379dcb75b0ecd04b369d0ea24407f2d378a76405130c89c57678b005cd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x55A2 5012 bytes
font_01_sfnt_off000066cf.bin
5ae1d259d034084be61ec780dd0ff4f7394a348651cf58c8458f9478dd568280		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66CF 1852 bytes
font_02_sfnt_off00006fbf.bin
2135557a6f105c44c68ff9e72890c630ac4cc7aade668ef46603323f203f784a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FBF 10352 bytes
font_03_sfnt_off00009351.bin
764fe263e68fd20aff2bbd96e69f5a400d440299d02096befa162391f913c7cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9351 16144 bytes

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