Malicious PDF — malware analysis report

Static analysis result for SHA-256 4be9c174537039ad…

MALICIOUS

PDF

46.4 KB Created: 2020-08-31 07:19:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b3c682f95258d74f9bb8cfb678fff53a SHA-1: b506b966678393bdbe8a3f38730cd8398f338734 SHA-256: 4be9c174537039ade71ec5876333363fb9127aa168934e2bb2125b1a9ed67f3b
150 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a primary malicious redirector URL embedded within the document body. This URL, 'https://ttraff.ru/wix?keyword=airbnb+welcome+guide+template', is designed to lure unsuspecting users. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is part of a phishing or redirection scheme.

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=airbnb+welcome+guide+template
    • https://static.usrfiles.com/ugd/b8c837_9b7fd98a56984821900bff5466b75b4a.pdf
    • https://static.usrfiles.com/ugd/daca0d_dc868061b60944009097cccf5212995d.pdf
    • https://static.usrfiles.com/ugd/3aca14_051ee05707a9470a8f7e5581880dad8d.pdf
    • https://static.usrfiles.com/ugd/7d21c0_0ee7454348f3401faf88082318e62c9d.pdf
    • https://static.usrfiles.com/ugd/f84671_8c176a639ba34bb1b2fa969cc84a3de4.pdf
    • https://static.usrfiles.com/ugd/7f16bd_a0fb070ade274ac5ba1e32d29f775d87.pdf
    • https://static.usrfiles.com/ugd/ba3095_c12866f9f7224be3ae80b3e66176e41c.pdf
    • https://static.usrfiles.com/ugd/ace02d_6ebbbc4f0dea4991902d051df75420a1.pdf
    • https://static.usrfiles.com/ugd/3649d2_bdc913cf61f24601b637689970a3c0bf.pdf
    • https://static.usrfiles.com/ugd/2f07a1_5c4fc57a28344acdb0da63091aceffb4.pdf
    • https://static.usrfiles.com/ugd/74c34a_bfa64b5eaecd4be6b9c0180ba605bf1a.pdf
    • https://static.usrfiles.com/ugd/b6edda_22a6ca17e3b64568bde31720edfe2316.pdf
    • https://static.usrfiles.com/ugd/e3ff21_5bebeb326fe149ce9e1732275e4ebda4.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006755.bin
fa3f484b4958284e582d104b0b97778be67535c8289bee1b9274c81aa398ee67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6755 5316 bytes
font_01_sfnt_off00007947.bin
2cafe8bf622d067ce76811381e266da1ce5b70e0de67a0d328fc6f3823e76b5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7947 10992 bytes
font_02_sfnt_off00009eda.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9EDA 4324 bytes

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