Malicious PDF — malware analysis report

Static analysis result for SHA-256 817e3987a1bcadff…

MALICIOUS

PDF

37.6 KB Created: 2020-08-30 10:17:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 683e9a50f488013339dc0a77d9d77c70 SHA-1: ac2b858d2509824a7da9a55f9e962aca81782ec5 SHA-256: 817e3987a1bcadff9e74a14498137f644822cc0185e8103e56b4be4e8d6d76c6
120 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=treinamento+de+for%25C3%25A7a+levado+a+s%25C3%25A9rio+pdf'. This URL is likely used to redirect the user to a malicious site. The document also contains a large number of embedded links, many of which point to Shopify domains, suggesting a link farm or SEO poisoning tactic to increase visibility. No scripts were extracted, and the document body is heavily obfuscated, but the presence of the malicious redirector is the primary indicator of malicious intent.

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.cc/wix?keyword=treinamento+de+for%25C3%25A7a+levado+a+s%25C3%25A9rio+pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tugogesobiwem.pdf
    • https://cdn.shopify.com/s/files/1/0431/6862/8890/files/verufetuxubo.pdf
    • https://cdn.shopify.com/s/files/1/0439/5306/2043/files/sinusoidal_waveform_diagram.pdf
    • https://cdn.shopify.com/s/files/1/0431/1970/6273/files/fundamentos_administracion_financiera.pdf
    • https://static.usrfiles.com/ugd/2813e2_3c72aa5c43ae48319ed8465c7b067ff8.pdf
    • https://static.usrfiles.com/ugd/b8c837_85ce0891ebfe4382ab458826ebf6b0b0.pdf
    • https://cdn.shopify.com/s/files/1/0435/6915/2159/files/how_to_use_cica-_care_gel_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0439/0889/0792/files/watch_my_hero_academia_two_heroes_en.pdf
    • https://cdn.shopify.com/s/files/1/0434/2277/7496/files/bastien_s_beginning_piano_for_adults.pdf
    • https://cdn.shopify.com/s/files/1/0434/0901/4934/files/abstract_lab_report_example_chemistry.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dovaxetudomorunuk.pdf
    • https://cdn.shopify.com/s/files/1/0434/1304/5398/files/superior_drummer_2_torrent.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_off00004f95.bin
09e8f233ad13bb836dfc95d27d0e0c7db591e783e96b5c38134741ec42ad5aad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F95 5520 bytes
font_01_sfnt_off00006205.bin
aba2783cb822d1f7075e1ba3238e5a66c810789787c10c57957ec11910feeab2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6205 12516 bytes

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