Malicious PDF — malware analysis report

Static analysis result for SHA-256 4278d1d0e8852d77…

MALICIOUS

PDF

44.3 KB Created: 2020-09-01 14:17:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 40c638c32ec6fe7d872d7a90bcab996d SHA-1: 5bcc2e560b6d74294127287bf7b8f98fc1731509 SHA-256: 4278d1d0e8852d7767ae12f73e0acd96800138b62251affa1a191b90cc6b27f8
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, a technique often used in SEO link farms. One of these links, 'https://ttraff.ru/wix?keyword=free+html+form+templates+code', is flagged as a known malicious redirector. The document body, though heavily garbled, contains references to HTML form templates and the wkhtmltopdf tool, suggesting a lure related to web development or design, which is then used to host the malicious links.

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+html+form+templates+code
    • https://static.usrfiles.com/ugd/0789d5_a682fa325ace46e597a87538817ff5e5.pdf
    • https://static.usrfiles.com/ugd/0286dd_ca0f4738b64349548f6ecfb7fda6acb5.pdf
    • https://static.usrfiles.com/ugd/d1d005_46b1b78f94fb470887ae92530876d449.pdf
    • https://static.usrfiles.com/ugd/1be480_af3dc838d8334521903243df34009cf0.pdf
    • https://static.usrfiles.com/ugd/b8c837_baadac04fac64f9b8afedd72cb7e4441.pdf
    • https://static.usrfiles.com/ugd/94e5ef_cb04b1dd39214712b57e9408d1b6ff2b.pdf
    • https://static.usrfiles.com/ugd/9f6a24_427e88a90be1489f81743f9b1c631342.pdf
    • https://static.usrfiles.com/ugd/fa6f14_d600e7aa56884d73985188f8fd0d5055.pdf
    • https://static.usrfiles.com/ugd/1f2646_849513b304cc4f8b9007f1a1e2087993.pdf
    • https://static.usrfiles.com/ugd/ce0e6d_5cff891ce7b649db84bcdfa655fb7304.pdf
    • https://static.usrfiles.com/ugd/81d6a4_08c0526175a84e55a455542ae83e314d.pdf
    • https://static.usrfiles.com/ugd/b7082a_7935ee9925cf44d8820f5d50e4021ebb.pdf
    • https://static.usrfiles.com/ugd/b8c837_760f2e9d855641ee95ef767bd6cd136c.pdf
    • https://static.usrfiles.com/ugd/76b6de_9d96d9837dce4889a7f93702598dd238.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000627b.bin
13a61713da65ae62a3b104d957a50ee73ed52e276793dbdbcefc34a63da7b942		 pdf-font-stream PDF embedded font (sfnt) at offset 0x627B 4984 bytes
font_01_sfnt_off0000736a.bin
437960e1afcf36adc625d14c007e2fb8be49a783ce45ea2390039eabb1fff212		 pdf-font-stream PDF embedded font (sfnt) at offset 0x736A 10164 bytes
font_02_sfnt_off0000961b.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x961B 4324 bytes

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