Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fd1bee31af79a75…

MALICIOUS

PDF

38.2 KB Created: 2020-09-08 14:39:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 003cfb4ce86fccfa63ef88b4a152dd8a SHA-1: 999d46b9c34bb144ee6585284316f8ccd0b145ed SHA-256: 0fd1bee31af79a7571137ef9e359e98b918313df98608416f0dd98ceaa752b79
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains a link farm, with many embedded URLs pointing to external PDF files. One primary URL, https://ttraff.link/wix?keyword=video+converter+ultimate, is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting a lure to trick users into clicking it. The ML classifier strongly indicates maliciousness, and the presence of a redirector link points towards a phishing or malware distribution attempt.

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.link/wix?keyword=video+converter+ultimate
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_1786e8a9697c40ec83e66de10965cb1e.pdf
    • https://static.usrfiles.com/ugd/6e13d9_0e3a1458e57a412e9567e603831dc98a.pdf
    • https://static.usrfiles.com/ugd/d43733_6887ffee2f554ddf8a4437f127d56e5e.pdf
    • https://static.usrfiles.com/ugd/b5472a_8bb484278612425e9c9c795680624936.pdf
    • https://static.usrfiles.com/ugd/aaaf79_f96ce428762440b59808ebd4c00c8e4b.pdf
    • https://static.usrfiles.com/ugd/529385_eb327146de104ca2a7e54cada4ae33ab.pdf
    • https://static.usrfiles.com/ugd/37987b_50673b83bcb842209e02d034df366aae.pdf
    • https://static.usrfiles.com/ugd/93971e_5a93ee7396c54cdeb904b1c22131215d.pdf
    • https://static.usrfiles.com/ugd/83f04e_eb569306bd7c4e65b9d00464ef23925d.pdf
    • https://static.usrfiles.com/ugd/cb4a18_d09d7c23e2504aadaf2aa9ef99dd6bdc.pdf
    • https://static.usrfiles.com/ugd/b8c837_cbafac0e7d174d3388260a72d41f770f.pdf
    • https://static.usrfiles.com/ugd/b8c837_1cd3d2001f3f4b24a3b17dcfecd18bb8.pdf
    • https://static.usrfiles.com/ugd/3ab5ed_22e095252a214bbd83c56f76182b3176.pdf
    • https://static.usrfiles.com/ugd/ea2f88_eaf89439f7614802a21671f98e7dedc8.pdf
    • https://static.usrfiles.com/ugd/1cc7e8_eb535dbffec84fcab33aeca891a978ba.pdf
    • https://static.usrfiles.com/ugd/9eb187_bcac6793e4494618b421381426ca91b0.pdf
    • https://static.usrfiles.com/ugd/dfb5f8_24f9ab33cc53486a8d6aab81ba8da804.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005931.bin
ddbba921d0292d5f62c392f3873df0f5b31cc2763f7f228e9525c27ca73b2deb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5931 4932 bytes
font_01_sfnt_off000069e4.bin
66c38833e0eadff415a3643d07aef7082575582c0c35c39b58d54ca1bd7e6b67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69E4 9908 bytes

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