Malicious PDF — malware analysis report

Static analysis result for SHA-256 8340cc293fc5f010…

MALICIOUS

PDF

43.5 KB Created: 2020-08-29 06:53:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 445403ece11d5a9d42e4340244f2508e SHA-1: cd8b58c5e469949f15fa7d9ef6da0d50471869b7 SHA-256: 8340cc293fc5f01052b19408b573eb4d66b7f033250814486adc4ca356e4931e
120 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.com/wix?keyword=examen+psicometrico+laboral+con+resp'. This URL is presented within the document body, disguised as a link related to a psychometric exam. The file also exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on Shopify. The primary malicious URL is the most critical IOC.

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.com/wix?keyword=examen+psicometrico+laboral+con+resp
    • https://cdn.shopify.com/s/files/1/0435/3379/5477/files/world_important_days.pdf
    • https://cdn.shopify.com/s/files/1/0432/9065/6921/files/molarity_problems_worksheet_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/6980/8548/files/asme_boiler_pressure_vessel_code_section_viii.pdf
    • https://cdn.shopify.com/s/files/1/0434/4568/2328/files/92882660767.pdf
    • https://cdn.shopify.com/s/files/1/0433/2843/8427/files/kazowoxukiviluzarefise.pdf
    • https://static.usrfiles.com/ugd/b8c837_e434b962fda841f8a0d9fdcce1494d7c.pdf
    • https://static.usrfiles.com/ugd/b8c837_7c7f3c03dff740008ea03e24f6f0d243.pdf
    • https://static.usrfiles.com/ugd/b8c837_d72b41df5afd49369f67247cd0d2f3fa.pdf
    • https://static.usrfiles.com/ugd/b8c837_f63b7dda1d4145da991c40674ec6acab.pdf
    • https://static.usrfiles.com/ugd/b8c837_62539a1e6c3244a3834940be9032f67d.pdf
    • https://cdn.shopify.com/s/files/1/0430/9444/2133/files/affairs_cloud_monthly_current_affairs_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/4652/6361/files/tcu_admission_guidebook_2018_19.pdf
    • https://cdn.shopify.com/s/files/1/0432/6942/3257/files/3057131076.pdf
    • https://cdn.shopify.com/s/files/1/0436/5703/5929/files/51070954645.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_off00006b8f.bin
accb289c788fce14ff6e7b2dcd9c795944fb0713e2ba8971dd46117785d566df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B8F 5244 bytes
font_01_sfnt_off00007d47.bin
a1e72ceac935163e5ba3d3f179526cfa0bb198f368ffff4cd1ab13dbf17e572e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D47 10604 bytes

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