Malicious PDF — malware analysis report

Static analysis result for SHA-256 f107954611f4a3ac…

MALICIOUS

PDF

33.6 KB Created: 2020-08-30 14:36:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: befca89cda643eb0cfca09209682b033 SHA-1: 8d1519f78fefd3230e73e8ba514222326647a302 SHA-256: f107954611f4a3ac0f2badd3015458d5d94efc28475084d662ab32131a10895d
150 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by a machine learning classifier and contains a link farm pointing to multiple external PDFs. One of the embedded URLs, 'https://ttraff.ru/wix?keyword=call+function+from+another+script+unity', is identified as a malicious redirector. The document body appears to be corrupted or obfuscated, but the presence of the malicious URL and the link farm strongly suggest a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=call+function+from+another+script+unity
    • https://static.usrfiles.com/ugd/b8c837_20c64357416d4a8f8f58299a4935b3b1.pdf
    • https://static.usrfiles.com/ugd/b8c837_d3faba924c5144b0899bbc2da6b149b6.pdf
    • https://static.usrfiles.com/ugd/b8c837_b333c4d086224df4b36d7181bd313ca5.pdf
    • https://static.usrfiles.com/ugd/b910ae_6617f16d274d4c46b233d03ef9bbbdfd.pdf
    • https://static.usrfiles.com/ugd/b8c837_1f1da4ce6619429eb17f13416e33ad5a.pdf
    • https://static.usrfiles.com/ugd/cbdbb6_f82d7ac8eb0745269f7936bba880a3ff.pdf
    • https://static.usrfiles.com/ugd/a86d68_31ab33d950f6458bbf558fd930ed6a6a.pdf
    • https://static.usrfiles.com/ugd/b8c837_6a7f1cb66f4347cf9df3c1238c4691dc.pdf
    • https://static.usrfiles.com/ugd/79e0dc_ef7df2dcdaed47ed9325a06272a30784.pdf
    • https://static.usrfiles.com/ugd/625844_3e435a39de1a4f1385dc726c7e1462b0.pdf
    • https://static.usrfiles.com/ugd/162fe6_2b6c8580afc641409f0f064dbfa5d47f.pdf
    • https://static.usrfiles.com/ugd/b8c837_6a38e8ebcf63434ba231abaef4201637.pdf
    • https://static.usrfiles.com/ugd/b8c837_62e8dabb33c44878b688fbbec30ba2a1.pdf
    • https://static.usrfiles.com/ugd/b8c837_570843dfa00848aa8f001642ff081495.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_off000043f4.bin
bd694be74bc40655bb014f6a2c28ecf03204d4a2c7fe56c9d468327d241c634e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x43F4 5260 bytes
font_01_sfnt_off000055b4.bin
8f2071c757762ec3659106f51d40e98e3a62d52c7ae49c2dd452121208b402c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x55B4 10708 bytes

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