Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a9b9ca03a105b08…

MALICIOUS

PDF

44.6 KB Created: 2020-08-30 02:13:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d08fe80338fa0abeccafd6afb8fb88e1 SHA-1: 1e590ca101d56c46f37fa171e9e6c6f2dfb79a45 SHA-256: 0a9b9ca03a105b08e6b2faf4c0392478deda5eca0985bbb97c995441d931033f
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The ML classifier strongly indicates maliciousness, and the presence of a link farm suggests an attempt to distribute malicious content or SEO manipulation. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or redirection attack.

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/wix?keyword=spore+%25D1%2581%25D0%25BA%25D0%25B0%25D1%2587%25D0%25B0%25D1%2582%25D1%258C+%25D0%25BC%25D0%25BE%25D0%25B4%25D1%258B+%25D0%25B1%25D0%25B5%25D0%25B7+%25D1%2580%25D0%25B5%25D0%25B3%25D0%25B8%25D1%2581%25D1%2582%25D1%2580%25D0%25B0%25D1%2586%25D0%25B8%25D0%25B8
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/e4ff69_670267d87a4140b4933daa0c7af40b5d.pdf
    • https://static.usrfiles.com/ugd/b8c837_2ec284379e554faf84c97e216abefd89.pdf
    • https://static.usrfiles.com/ugd/3b0c81_836998f9bf704b94a2d2073311652821.pdf
    • https://static.usrfiles.com/ugd/cac9e4_b883e5ccf3f2438c9c3d02debe4c0828.pdf
    • https://static.usrfiles.com/ugd/49be48_4bf36c2a9b06495c8bdaee111469ab64.pdf
    • https://static.usrfiles.com/ugd/b8c837_5f07abd4e94e4775beff56f609c3000f.pdf
    • https://static.usrfiles.com/ugd/b8c837_e1c8d50071d948eb9fd9ccfb184bf6f0.pdf
    • https://static.usrfiles.com/ugd/e8506d_7cbe564b06c2469b960be947316ce317.pdf
    • https://static.usrfiles.com/ugd/0a593f_529f073cbada4ad48370837d6c92c0a9.pdf
    • https://static.usrfiles.com/ugd/b8c837_4894bbb1a51b432d995f3a6f5d64b0ce.pdf
    • https://static.usrfiles.com/ugd/b8c837_86d9ae27a821481aa156e7006b923e4a.pdf
    • https://static.usrfiles.com/ugd/b8c837_1a1696d41ac94ba9a488f2d11346b43b.pdf
    • https://static.usrfiles.com/ugd/b8c837_c468c2040188450289c3949a2aa6740d.pdf
    • https://static.usrfiles.com/ugd/b11f6d_6b188e16d1044e52b8c37ca409eee69d.pdf
    • https://static.usrfiles.com/ugd/b47706_7190ad8ebea145de8396cc10b18ec223.pdf
    • https://static.usrfiles.com/ugd/b8c837_2762b56172ef4ef8bb40c865dfa9f22b.pdf
    • https://static.usrfiles.com/ugd/b8c837_5c90b5d5b093420bb5424da4e9ecb507.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_off00005ed8.bin
c3cca740083d9c06457ba8a7bedc606f239980640053f5b0919afc829c8b0f6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5ED8 6268 bytes
font_01_sfnt_off00007340.bin
d6541119160cccf7619e9be90144a22d194cccc5941dfe7009cc0f8f638cd47f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7340 15492 bytes

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