Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbdba73610b9c28c…

MALICIOUS

PDF

39.9 KB Created: 2020-08-30 03:13:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9216b5488cc1a6be516764d05867e0d1 SHA-1: 1705828698b9fe0303aa0110b766dfd8635c450b SHA-256: dbdba73610b9c28c483630a007fc43c1d1944c19866404881d64513d151d645e
120 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'Cdc concussion post test answers' and the URL itself, suggesting a lure to a malicious site. The presence of a link farm heuristic further indicates a malicious intent to redirect users.

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=cdc+concussion+post+test+answers
    • https://static.usrfiles.com/ugd/784815_8e81f3ee911b40ebbbd53ee1dc1bd90d.pdf
    • https://static.usrfiles.com/ugd/0f5b72_e4a2ba312fc747569c34b6d5f21a6e5e.pdf
    • https://static.usrfiles.com/ugd/b8c837_6eb4a8b1930d423eb87b3e8f3afcc765.pdf
    • https://static.usrfiles.com/ugd/b8c837_fbbe5d7c3b594555a9671ce984d57710.pdf
    • https://cdn.shopify.com/s/files/1/0437/7998/1470/files/girl_guides_promise.pdf
    • https://cdn.shopify.com/s/files/1/0438/9991/2344/files/lake_ontario_salmon_report_2018.pdf
    • https://cdn.shopify.com/s/files/1/0439/6027/1006/files/business_model_canvas_airbnb.pdf
    • https://cdn.shopify.com/s/files/1/0428/3917/9420/files/siemens_bq_breaker.pdf
    • https://cdn.shopify.com/s/files/1/0428/4504/4892/files/partnership_fundamentals.pdf
    • https://cdn.shopify.com/s/files/1/0430/0524/7647/files/82819004097.pdf
    • https://cdn.shopify.com/s/files/1/0437/5887/8872/files/fibavilobigabu.pdf
    • https://cdn.shopify.com/s/files/1/0433/8096/5534/files/amcas_letter_request_form.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_off00005fa1.bin
65d0e8c98e45c79f43a7e1e4af69c9955ee910798d4d9ed65f2ae6ac30e89eb3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FA1 5032 bytes
font_01_sfnt_off000070d7.bin
66f4c80cf09135b06f4d5e857a3983ea34299ab62c76a2ca8167842a502a9911		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70D7 10012 bytes

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