Malicious PDF — malware analysis report

Static analysis result for SHA-256 a33e14961e07fafb…

MALICIOUS

PDF

50.9 KB Created: 2020-09-02 22:06:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 79c2af706077a1d7f9badb4967ceaa93 SHA-1: 6b36514cc6403ffdc4ba34140f8c6f295aa15ff3 SHA-256: a33e14961e07fafb431b2be246c35cecf55c5c06e5bf351f4f2eba23ed53b308
120 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.me/wix?keyword=acetabuli+form+en+espa%25C3%25B1ol'. Additionally, it exhibits characteristics of a PDF SEO link farm, embedding numerous links to external PDFs hosted on 'static.usrfiles.com'. The document body, though heavily garbled, contains the same redirector URL and a reference to 'wkhtmltopdf', suggesting the PDF was generated programmatically to host these links. The primary intent appears to be directing users to malicious infrastructure.

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.me/wix?keyword=acetabuli+form+en+espa%25C3%25B1ol
    • https://static.usrfiles.com/ugd/de65f7_0df2c4d9e7584588b7317a0a81e16725.pdf
    • https://static.usrfiles.com/ugd/f4de5e_01f7da76f93442afbc5a34c1fafb17a8.pdf
    • https://static.usrfiles.com/ugd/822ecd_d9caa5f7a99c42429d34b4eb5285d9ce.pdf
    • https://static.usrfiles.com/ugd/cd81e9_58b82bcbaa394ccf9edf6b85e7cc63fb.pdf
    • https://static.usrfiles.com/ugd/0e2875_dbc7c2b53ff14367be0821fe5e1c3935.pdf
    • https://static.usrfiles.com/ugd/83f04e_254f85963f41434b8fb4e519fe679834.pdf
    • https://static.usrfiles.com/ugd/7f16bd_9ee2e9d2e0a64d4caa2bd7e28149a529.pdf
    • https://static.usrfiles.com/ugd/0d9a50_baff0f061f0346558f67b3c0bf812991.pdf
    • https://static.usrfiles.com/ugd/2274a7_538486013dfc4e9cb3fdb14931de2eed.pdf
    • https://static.usrfiles.com/ugd/76156b_582c4b7f33a145479489eeef83c13721.pdf
    • https://static.usrfiles.com/ugd/e32576_4b7061d9aa5c4f8e8d5dac4a0cddd38d.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b9a.bin
099463af694b7373451ef143c00d161628f5b7abb3afbac44cb3a69e2d642b43		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B9A 5504 bytes
font_01_sfnt_off00007df8.bin
0f9a4709d21c74f6b60b935e25bb0605329bd64eebda2cd833433e87bc764728		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DF8 12996 bytes
font_02_sfnt_off0000a856.bin
bf4ab31430389bf485bb31cdb084220213cce32017bc6689ef711d4e78092607		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA856 16072 bytes

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