Malicious PDF — malware analysis report

Static analysis result for SHA-256 46e780cdb7ea2681…

MALICIOUS

PDF

40.6 KB Created: 2020-08-29 12:05:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bdc89050a63322959116375f3e83ab52 SHA-1: 9ac2c385885d06260f0b4437965680b1ab5f8af5 SHA-256: 46e780cdb7ea2681d6ac5b52d6efe5724bc29140dc2eb9ac5527a6e70ced2799
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wix?keyword=legend+of+drizzt+pdf'. Additionally, it exhibits characteristics of a PDF link farm, with numerous links hosted on 'static.usrfiles.com'. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be social engineering via a deceptive link within the document.

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=legend+of+drizzt+pdf
    • https://static.usrfiles.com/ugd/b8c837_a80bb959ef0b4f749cae6bab4368bd40.pdf
    • https://static.usrfiles.com/ugd/b8c837_42a66ad919d34360ae6ce3c67c1ee1a9.pdf
    • https://static.usrfiles.com/ugd/b8c837_ee6500cddca948f0a9db217b15bce96f.pdf
    • https://static.usrfiles.com/ugd/b8c837_914e50164efb4cff885d8ec87f55bdec.pdf
    • https://static.usrfiles.com/ugd/b8c837_24029676a1e841fd88e991b941f4c2c0.pdf
    • https://static.usrfiles.com/ugd/b8c837_671c8c852bd8412b8eb3fa29d4ddc315.pdf
    • https://static.usrfiles.com/ugd/b8c837_34c3d8857fb047e7a1b7ed9bca08d85a.pdf
    • https://static.usrfiles.com/ugd/b8c837_bf85d2d082af469d8735312db3fb9416.pdf
    • https://static.usrfiles.com/ugd/b8c837_a5fc0ca99bee4c7baa879855914db20a.pdf
    • https://static.usrfiles.com/ugd/b8c837_ef728de09cd5459fa356c73fb68a9869.pdf
    • https://cdn.shopify.com/s/files/1/0429/9217/3217/files/lidakapolitudedenujakosag.pdf
    • https://cdn.shopify.com/s/files/1/0430/1540/5725/files/26283199277.pdf
    • https://cdn.shopify.com/s/files/1/0435/8710/9023/files/sacramento_county_zip_code_map.pdf
    • https://cdn.shopify.com/s/files/1/0435/9726/7112/files/92865452721.pdf
    • https://cdn.shopify.com/s/files/1/0433/6726/8517/files/6949847542.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_off00006331.bin
a674fe8d16245736816eafe254b81f8e0a96f7c06dd9c23d43ea65058663675f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6331 4780 bytes
font_01_sfnt_off00007399.bin
bd40c71bcee70f04c2bfefcee2032d8ecd12fcebfac1ed4fda96c7a1a483b6c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7399 10104 bytes

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