Malicious PDF — malware analysis report

Static analysis result for SHA-256 e47fb3e4acb5a488…

MALICIOUS

PDF

40.7 KB Created: 2020-09-01 13:01:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6420cc0d808c0945cf0c9af6f505e247 SHA-1: 3e83679a335002ee1dfe1b1eb5f9b12ac88bad4a SHA-256: e47fb3e4acb5a48887808f51416f1dbdad8c72f188534449285ce9354ceacaf5
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 identified a link to a known malicious redirector at ttraff.ru, which is likely the primary malicious payload delivery mechanism. The document body, though heavily obfuscated, contains the target URL and several benign-looking PDF links, suggesting a lure to a malicious site disguised as a document.

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=uniform+illumination+meaning+in+english
    • https://static.usrfiles.com/ugd/b50c55_1f0eb03dfc7048b5bc8cefd17658006d.pdf
    • https://static.usrfiles.com/ugd/a44510_0a9effb79dff4936947c58cf0cc64725.pdf
    • https://static.usrfiles.com/ugd/f515ca_cb5afd6aee41438e9caac48ebde3051a.pdf
    • https://static.usrfiles.com/ugd/b8c837_6cd13bc5671c41d9bfb1df8e0549c6cc.pdf
    • https://static.usrfiles.com/ugd/b8c837_fd8539a7c5b848be8d4ab155ebe52973.pdf
    • https://static.usrfiles.com/ugd/b7306e_d113ad217868458bbb545969fc627430.pdf
    • https://static.usrfiles.com/ugd/6290de_a2b2e7dc220240f1830afbe26ffce9aa.pdf
    • https://static.usrfiles.com/ugd/c12414_1ccddc160b9f42eeb4a6c3eec261cbc9.pdf
    • https://static.usrfiles.com/ugd/07e02c_92384d51e6a342ac8cbfd4926b1407ba.pdf
    • https://static.usrfiles.com/ugd/0779a3_933f256d4b574215b6242a544593c99a.pdf
    • https://static.usrfiles.com/ugd/d7ba0f_3a16c351a5084ae1b149604245cda63e.pdf
    • https://static.usrfiles.com/ugd/b8c837_58416f673d194866acf20d68800139f1.pdf
    • https://static.usrfiles.com/ugd/96bf9d_1ed958d9dbaa44d69ed06da379bf4dec.pdf
    • https://static.usrfiles.com/ugd/d9d1f5_30735cdeae0346099bf9ce300174cd5d.pdf
    • https://static.usrfiles.com/ugd/b8c837_cf53d8e365f34b8cb2a280aba733265a.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_off00005fbe.bin
5331d0c74c69c3bb336548d45460057e5b9041a80cd2eef646fd9b2ebc55cfa4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FBE 5172 bytes
font_01_sfnt_off0000712d.bin
16c2f89bc5ec3dd353864d1b70de820940436b652deb0c50a2ed189bfe280780		 pdf-font-stream PDF embedded font (sfnt) at offset 0x712D 10272 bytes

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