Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc38443d19daa00f…

MALICIOUS

PDF

43.0 KB Created: 2020-08-30 01:22:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 505736d18a9852c19be8f540ac55c4f1 SHA-1: 32c11fe6ff1cd3bf576c9d18d74d884cb034a275 SHA-256: cc38443d19daa00fb815531600aca08431b63abef35092fc5ccc46884d06ebb3
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to a link farm hosted on static.usrfiles.com. One critical heuristic firing indicates a PDF redirector link to ttraff.ru, which is known malicious infrastructure. The document body, though heavily obfuscated, contains the title 'Crown prep steps dental assistant' and the malicious URL, suggesting a lure to a malicious site disguised as relevant content.

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.ru/wix?keyword=crown+prep+steps+dental+assistant
    • https://static.usrfiles.com/ugd/b8c837_e3438c9ce42e43fda0f973d6262c13d3.pdf
    • https://static.usrfiles.com/ugd/b8c837_1fd470b8877947c292e1a654f1a01b2e.pdf
    • https://static.usrfiles.com/ugd/724fb5_57c6881e1e664b0d9467ae23620da859.pdf
    • https://static.usrfiles.com/ugd/b8c837_fe522e3589b548c8a71564471d40eba4.pdf
    • https://static.usrfiles.com/ugd/b8c837_bb1c2cc5fe0c464d98a326934d4d392c.pdf
    • https://cdn.shopify.com/s/files/1/0434/3414/7989/files/vanemobukedupidofal.pdf
    • https://cdn.shopify.com/s/files/1/0437/6713/6408/files/vikings_series_4_episode_guide.pdf
    • https://cdn.shopify.com/s/files/1/0434/0439/4646/files/baldurs_gate_enhanced_edition_romance_guide.pdf
    • https://static.usrfiles.com/ugd/8b9728_2b64b3ec7f4c4c9e9934198eaee3a4d2.pdf
    • https://static.usrfiles.com/ugd/b8c837_06f4b874ea354103be66a26c2c57c641.pdf
    • https://static.usrfiles.com/ugd/52b593_92829593cdf2403988c91462239fe271.pdf
    • https://static.usrfiles.com/ugd/74c34a_5cf6842778d84dc3bed3d2255cbdfc48.pdf
    • https://static.usrfiles.com/ugd/b8c837_f2a30a9a72904156b09b47f6b151624a.pdf
    • https://static.usrfiles.com/ugd/b8c837_b5eb5ae4d6544599a977c6d99d24de4d.pdf
    • https://static.usrfiles.com/ugd/d54300_1008346048de49b78b744dda8f4d3883.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_off00006ad0.bin
595203173f45dbfcef61786b34c9cdc8f777a223b773477025a4eac57210ebe3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AD0 4952 bytes
font_01_sfnt_off00007bbb.bin
1414be1cb64779b608d4767fab928b5e5535d1b9a980399432fa40b20b2ded3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BBB 10332 bytes

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