Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b6dbb3badba5146…

MALICIOUS

PDF

42.0 KB Created: 2020-08-29 21:40:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8ed4252b435996b81e6e9dbbcb07c1b9 SHA-1: 2fe4d73d7ad71f8ac33c1a5d4d8c6913c0179779 SHA-256: 9b6dbb3badba5146229a94671701fe27fdd6b69034cd6fc671ff9ba1a39ae209
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link T1059.001 PowerShell

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 URL that triggers the redirector, suggesting a social engineering lure related to the book title.

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=sociology+in+our+times+8th+edition
    • https://static.usrfiles.com/ugd/b8c837_a81dc73f478046abb8e658efe26eccdc.pdf
    • https://static.usrfiles.com/ugd/b8c837_5444f467fc5a44e5adaaa0d161119b7f.pdf
    • https://static.usrfiles.com/ugd/b8c837_94a734d428014021b55e1f01f855b377.pdf
    • https://static.usrfiles.com/ugd/b8c837_01997eb66f384cb2b5483b4ff4489c7d.pdf
    • https://static.usrfiles.com/ugd/b8c837_992ee16689ec42778a78798ee7fe50aa.pdf
    • https://static.usrfiles.com/ugd/b8c837_8c5064a05d2f46b4ac596c50e7c9ba93.pdf
    • https://static.usrfiles.com/ugd/b8c837_9c41b12f55664c5b90d4efb899e7a3a3.pdf
    • https://static.usrfiles.com/ugd/b8c837_534f01251945428bbf863bea53b52996.pdf
    • https://cdn.shopify.com/s/files/1/0438/8575/6568/files/dodorekusitajimat.pdf
    • https://cdn.shopify.com/s/files/1/0432/8148/1884/files/rojojimunowizededezex.pdf
    • https://cdn.shopify.com/s/files/1/0437/9131/9200/files/beginner_marathon_training_plan.pdf
    • https://cdn.shopify.com/s/files/1/0433/7342/8888/files/togew.pdf
    • https://cdn.shopify.com/s/files/1/0430/8421/8521/files/kagigilakowozejub.pdf
    • https://cdn.shopify.com/s/files/1/0430/9604/7783/files/giwonutunimarib.pdf
    • https://cdn.shopify.com/s/files/1/0434/2589/0469/files/florida_rt-_6.pdf
    • https://cdn.shopify.com/s/files/1/0437/8741/9805/files/39614574808.pdf
    • https://cdn.shopify.com/s/files/1/0429/8991/2218/files/99306441880.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_off000064fc.bin
59ced95ee278840826f0014ed41c69211f09ebbf4bdf9826322ebb92887d9a18		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64FC 5544 bytes
font_01_sfnt_off0000779e.bin
f291b4bddb8e07e13e33ea1287382e1070b6882851c0a86f82a79795492e0a96		 pdf-font-stream PDF embedded font (sfnt) at offset 0x779E 10324 bytes

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