Malicious PDF — malware analysis report

Static analysis result for SHA-256 873a27b881a3d724…

MALICIOUS

PDF

35.2 KB Created: 2020-08-31 10:16:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8bb95415436056c8a6b6b9e7d41813e3 SHA-1: 9afc7352c16183a4413d57b533ff504a6ed6b2ad SHA-256: 873a27b881a3d724d7458e36880496a8e93454d96bbf528d769a2bf3d01fe543
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, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains references to the malicious URL and other benign-looking PDF files hosted on static.usrfiles.com. This suggests a link farm or redirection attack designed to lead users to malicious content.

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=poe+monstrous+treasure
    • https://static.usrfiles.com/ugd/01bc73_aaafc0ea5401467ab671de1d986a547a.pdf
    • https://static.usrfiles.com/ugd/a467d2_e3d5df81ff6544569004122e9469dde6.pdf
    • https://static.usrfiles.com/ugd/b8c837_13ee047d00e046cb88a652344cdcc94e.pdf
    • https://static.usrfiles.com/ugd/b8c837_7a24cee329544235af70991f2c28d87c.pdf
    • https://static.usrfiles.com/ugd/b8c837_5182941cd8684036b6e0e4b4ad047ed1.pdf
    • https://static.usrfiles.com/ugd/0c41e7_ce3a4eb153234435ab225dd60740c3e7.pdf
    • https://static.usrfiles.com/ugd/52b593_302b7ab815ff43618d197fabc403a607.pdf
    • https://static.usrfiles.com/ugd/bb13a2_61ec89a058094cbf84026bbc126971a4.pdf
    • https://cdn.shopify.com/s/files/1/0441/1329/7560/files/78308226683.pdf
    • https://cdn.shopify.com/s/files/1/0434/5249/8070/files/electronic_cables_and_connectors_mcq.pdf
    • https://cdn.shopify.com/s/files/1/0433/8404/5719/files/apps_to_annotate_ipad_pro.pdf
    • https://cdn.shopify.com/s/files/1/0432/3993/2064/files/tudejolaxipobubekuf.pdf
    • https://cdn.shopify.com/s/files/1/0431/7567/4024/files/grade_3_english_grammar_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0435/3579/4340/files/apartment_lease_application.pdf
    • https://cdn.shopify.com/s/files/1/0434/2172/8918/files/department_of_transport_qld_road_report.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gifowugebivagobawogun.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_off00004db2.bin
c86e7f91000dc30a67100852718db67e58391f2e8fceecc601f03fc072b7692e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4DB2 4800 bytes
font_01_sfnt_off00005dde.bin
feb436e70f89015f8686956bf38edd045057d62a4d41df01972fee1a4ab7e8f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DDE 10112 bytes

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