Malicious PDF — malware analysis report

Static analysis result for SHA-256 547cedb1ac8402c6…

MALICIOUS

PDF

41.4 KB Created: 2020-09-02 04:30:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 368e327e065080ef8aede8d4f9b3f590 SHA-1: 0f14cb3aa4a6542ee731e86be045f36f7a5b6325 SHA-256: 547cedb1ac8402c6408706b039b3b4545714069a0e04830658404902b271088b
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, with one prominent link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=carried+crossword+puzzle+answer', suggesting a lure to a malicious site. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous links to external PDFs indicates a link farm designed to direct 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/pify?keyword=carried+crossword+puzzle+answer
    • https://static.usrfiles.com/ugd/e33828_c248424e723c4cd1b696dfb7b7dcef9c.pdf
    • https://static.usrfiles.com/ugd/95ea6b_49b20b2bcb4c4a49b2e3c2a5aa6743a8.pdf
    • https://static.usrfiles.com/ugd/8b49c6_794c874e3dd74f19a8a5590d0c9f1193.pdf
    • https://static.usrfiles.com/ugd/4b7290_9ad6119df98c4de0b74bc53f0a502369.pdf
    • https://static.usrfiles.com/ugd/67e251_a476d9a8c194412595123c3584185387.pdf
    • https://static.usrfiles.com/ugd/b8c837_13c88426f0d94e63b2eba14d524863fe.pdf
    • https://static.usrfiles.com/ugd/784815_3dd084ad594c4634b4506a3b9d3c9b8e.pdf
    • https://static.usrfiles.com/ugd/12dc78_dbea557c953547859d7af4503675e3f3.pdf
    • https://static.usrfiles.com/ugd/3f0e57_9b4f83eac2fc42039288ce4e1fa474f0.pdf
    • https://static.usrfiles.com/ugd/b8c837_719c5dcdcfe849dfae97a78cf33d54d3.pdf
    • https://static.usrfiles.com/ugd/a3b54b_f2fd2db9b6dd4e279252116e7902e7aa.pdf
    • https://static.usrfiles.com/ugd/8cbfce_b82451731a224b4589448e59800df01d.pdf
    • https://static.usrfiles.com/ugd/1fa6dd_be4d07d02c51405fa3511ebffb9de5c1.pdf
    • https://static.usrfiles.com/ugd/6cf0f5_af44287ecc42497b9829bf2218049935.pdf
    • https://static.usrfiles.com/ugd/b8c837_cc789b0b1a8747149f30934ec1a06304.pdf
    • https://static.usrfiles.com/ugd/917232_9b02fb2a580b487ea01e32708d2e4d43.pdf
    • https://static.usrfiles.com/ugd/e42ee3_e6d518e09ec0425db6f482790aa75eb7.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_off00006471.bin
649fd8ae2208fbdc7ef8caa1a939e0d799c33c9fac26cb047ff5f78256344748		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6471 5116 bytes
font_01_sfnt_off000075f9.bin
febc6212a7125985c7f36f8ca8f2bad389a1666b0831fc9b39122ffd319b9c56		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75F9 10232 bytes

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