Malicious PDF — malware analysis report

Static analysis result for SHA-256 e50f3a5d1d700752…

MALICIOUS

PDF

57.2 KB Created: 2020-08-31 16:48:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7e76c1e3af62572ae207afaf2c96591d SHA-1: 33daea8f407215410a996ad0b955ecde4b48cad0 SHA-256: e50f3a5d1d70075228777b1d546fa84787d1250a853f7eab7cb517c8fe7c4715
120 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'ttraff.cc'. This link is presented within the document body, disguised as a research paper download. The document also exhibits characteristics of a link farm, with numerous embedded URLs, many of which point to 'static.usrfiles.com'. The primary malicious IOC is the redirector URL, which likely leads to further malicious content or phishing pages.

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=statistical+methods+for+healthcare+research+pdf
    • https://static.usrfiles.com/ugd/b8c837_b9d89722f75f483983a8e7d72e5640f8.pdf
    • https://static.usrfiles.com/ugd/b8c837_3b6e3b6021034155861f02ebd27a7b7e.pdf
    • https://static.usrfiles.com/ugd/b48b60_3b964ea54bc74a5e946c21de5cccbe28.pdf
    • https://static.usrfiles.com/ugd/0bcf16_7cbc9fd07497446f9aaffa7b537faecc.pdf
    • https://static.usrfiles.com/ugd/b8c837_bdfd312934db4f7abe1f82318d54d2ac.pdf
    • https://cdn.shopify.com/s/files/1/0430/0147/9321/files/fezorovo.pdf
    • https://cdn.shopify.com/s/files/1/0433/8624/1187/files/vamafowipuwejosalolimevik.pdf
    • https://cdn.shopify.com/s/files/1/0437/2014/7095/files/leave_letter_to_class_teacher_for_absence.pdf
    • https://cdn.shopify.com/s/files/1/0431/6132/1634/files/74699579548.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tedogunugovosilogupex.pdf
    • https://static.usrfiles.com/ugd/79e0dc_12986ecdc9ef438cae06806890b66959.pdf
    • https://static.usrfiles.com/ugd/24853a_75efe02c66f64d31b52543acfe979950.pdf
    • https://static.usrfiles.com/ugd/269bb8_e0d6b6fe88b6443eaacb5f76df663e45.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_off00009996.bin
4579025e15974741b5167ff1294ab104cff5a0d722ef5004823169687e569e57		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9996 5500 bytes
font_01_sfnt_off0000ac17.bin
95602d1854b0b67512ce442ecee7321f4281b525cf5ef4385ca2dbd3973fe8e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC17 13848 bytes

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