Malicious PDF — malware analysis report

Static analysis result for SHA-256 98c316bd48833188…

MALICIOUS

PDF

43.7 KB Created: 2020-08-30 05:51:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4260cee7eddf3aa2f2054698aa98176a SHA-1: bcb36befec60b0532c7eb8b2dc57abae607094b7 SHA-256: 98c316bd48833188476ac3708bf15ea6ceed07702cedf17298739efd873cb5cd
120 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, directing users to 'https://ttraff.ru/wix?keyword=free+lesson+plans+for+teaching+readi'. The document body, though heavily obfuscated, also contains this URL and numerous other links hosted on 'static.usrfiles.com', suggesting a link farm or SEO poisoning tactic. The primary attack pattern is to lure users via a deceptive document title and redirect them 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.ru/wix?keyword=free+lesson+plans+for+teaching+readi
    • https://static.usrfiles.com/ugd/b8c837_7f9fc17a04d442549d9519356a8adbaf.pdf
    • https://static.usrfiles.com/ugd/99afdc_c3624e09650d419e99486921596cfb1e.pdf
    • https://static.usrfiles.com/ugd/9374a7_3c1a56ba78fc44e9ac239797ee31ab5c.pdf
    • https://static.usrfiles.com/ugd/b8c837_b1054495f0e94cb0a6339e3c4811fb71.pdf
    • https://static.usrfiles.com/ugd/e3ff21_230780fbd13a47c1a85d2cf070abb3c7.pdf
    • https://static.usrfiles.com/ugd/e3ed1f_da4d3382e330462d9a8d450a12d783e2.pdf
    • https://static.usrfiles.com/ugd/eda9ba_39e912362e624fc3be6a211e12c6b2fa.pdf
    • https://static.usrfiles.com/ugd/b8c837_f369167a16424859b507f67f9304f693.pdf
    • https://static.usrfiles.com/ugd/b8c837_b9d89722f75f483983a8e7d72e5640f8.pdf
    • https://static.usrfiles.com/ugd/0dcf4b_06b9ef25dee34248940338312a29685e.pdf
    • https://static.usrfiles.com/ugd/e2f7e1_0e5ac4a8219547b48fe590888ecc9d61.pdf
    • https://static.usrfiles.com/ugd/f1780b_6348559919364b92ab83db2b3b3601d5.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_off00006c2a.bin
a6d31a7d566551915da4e69e1dead1d3f0681633d840629d64d039ab1b8129d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C2A 5372 bytes
font_01_sfnt_off00007e66.bin
4ffabbfc50892024ae26f489af3a8addedf93155979dfce9e90071b4cc880412		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E66 10496 bytes

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