Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f9a4e912e9db476…

MALICIOUS

PDF

39.2 KB Created: 2020-08-31 02:51:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b91ea64b6aa27c8a30066029ebade96 SHA-1: e7b85155309dccd3067802a9807161c08936b1e2 SHA-256: 0f9a4e912e9db476ded1f3d5ee364796538b08978721a3484cf5f49790ec4eed
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service. The primary malicious URL identified is https://ttraff.cc/wix?keyword=... which is designed to lead users to further malicious content. The presence of a link farm and a malicious redirector strongly suggests 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.cc/wix?keyword=%25D1%2582%25D0%25B5%25D0%25BE%25D1%2580%25D0%25B5%25D1%2582%25D0%25B8%25D1%2587%25D0%25B5%25D1%2581%25D0%25BA%25D0%25B0%25D1%258F+%25D0%25BC%25D0%25B5%25D1%2585%25D0%25B0%25D0%25BD%25D0%25B8%25D0%25BA%25D0%25B0+%25D0%25BC%25D0%25B5%25D1%2589%25D0%25B5%25D1%2580%25D1%2581%25D0%25BA%25D0%25B8%25D0%25B9+%25D0%25B7%25D0%25B0%25D0%25B4
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_1d24299663f74cb9828fc4d8b1de3ae4.pdf
    • https://static.usrfiles.com/ugd/b8c837_f8f0a6fa93dd4babb76a95e8490c82dd.pdf
    • https://static.usrfiles.com/ugd/2e16aa_acf72ee7d32b407892745697bd2ad22c.pdf
    • https://static.usrfiles.com/ugd/e6092c_1e3ad683d6534793ae4f91527a4e8a0f.pdf
    • https://static.usrfiles.com/ugd/a2ebd8_6bc7772c935b4c2299c08769ad433d10.pdf
    • https://static.usrfiles.com/ugd/b8c837_66510327cdb34ea39dd840bf1933f4ff.pdf
    • https://static.usrfiles.com/ugd/b8c837_1dca233853b44c6e80c6aa52ceec16bc.pdf
    • https://static.usrfiles.com/ugd/fd3290_045707caff0648bd97e2e0b371a5bea5.pdf
    • https://static.usrfiles.com/ugd/b8c837_0ed2ea15a0cd4167ab7d6c4bb16740d8.pdf
    • https://static.usrfiles.com/ugd/26481d_49cb6f0812244f47b36c70028e8df222.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_off00005030.bin
3facdded2e3176e84864c98410c3624ea3c267d2d212eca222bca4a5a072314a
pdf-font-stream PDF embedded font (sfnt) at offset 0x5030 5828 bytes
font_01_sfnt_off00006385.bin
2c9029c7a29c693048cc5ffd72fe912c3a4bb08a834b3c02051d02af23b9619e
pdf-font-stream PDF embedded font (sfnt) at offset 0x6385 13140 bytes