Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7ba42b2910fe3fb…

MALICIOUS

PDF

36.3 KB Created: 2020-08-31 13:46:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c450291453f90abc3bd842c814a208a SHA-1: 8ed0f68663a38b5d6e95a46c0de225fecd99480f SHA-256: b7ba42b2910fe3fb81e6b17882e4b018dc2be66e2128b03f51f30e6457cb2d74
154 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to a known malicious redirector. Additionally, it exhibits characteristics of a PDF SEO link farm, embedding numerous external links, with the primary malicious URL being https://ttraff.ru/wix?keyword=datetimepicker+format+wpf. The document body, though heavily obfuscated, also contains this URL and other PDF links, reinforcing the attack pattern of redirecting users to potentially harmful content.

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=datetimepicker+format+wpf
    • https://static.usrfiles.com/ugd/b8c837_afd93b34cf5044dc8fdf7ef74441fcd7.pdf
    • https://static.usrfiles.com/ugd/8b2c09_6b4a641169ef4d7383935b0567684368.pdf
    • https://static.usrfiles.com/ugd/b8c837_06f4b874ea354103be66a26c2c57c641.pdf
    • https://static.usrfiles.com/ugd/b8c837_f2a30a9a72904156b09b47f6b151624a.pdf
    • https://static.usrfiles.com/ugd/b8c837_5f9c85f70c984a9ea71bcdac4e2a5f33.pdf
    • https://static.usrfiles.com/ugd/47b1e8_f6d562fa62f144fe880b066aaf9870dd.pdf
    • https://static.usrfiles.com/ugd/b8c837_e97ee4ff80f54731a293fcb86ae90ead.pdf
    • https://static.usrfiles.com/ugd/7e0eb0_fc3638817bf24eafbb1a94a200fa4012.pdf
    • https://static.usrfiles.com/ugd/72216b_0c5bc741f792475882cd11e789dbfeca.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_off00004edf.bin
fb6aedbb56211b5a01dff88691b7b77e6c0e25eab1f82ef79197272e8e07e378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4EDF 5108 bytes
font_01_sfnt_off0000604a.bin
e7e4849ca3893a5b866670b87a9eaf01cf28cea0f112ec9a3f5e3838f0fb5f8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x604A 10784 bytes

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