Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ca42e9437cca2fa…

MALICIOUS

PDF

39.6 KB Created: 2020-08-06 04:51:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3c7a7618b84cc88e88b7e661739e52c3 SHA-1: 6c82a128ab8ef95b3fd36d9663b9f4dc9e26513d SHA-256: 3ca42e9437cca2fadeaf658be9513944bf07c3c676303918892ede2452066e2a
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.001 Command and Scripting Interpreter: PowerShell

The PDF file contains a heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.cc/pify?keyword=volume+formula+worksheet+pdf', is designed to redirect users to potentially harmful content. The file also exhibits characteristics of a link farm, embedding numerous external PDF links, many of which are hosted on Shopify. The primary malicious link 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.cc/pify?keyword=volume+formula+worksheet+pdf
    • http://files.be-remarkable.com.au/uploads/1/3/1/8/131857117/rulodatap_zakafadezu.pdf
    • http://files.venlas.com/uploads/1/3/0/7/130739225/adf76f40d47568.pdf
    • http://files.en.icm-basel.ch/uploads/1/3/1/4/131437775/f1bd51.pdf
    • https://cdn.shopify.com/s/files/1/0430/8946/1410/files/23820840440.pdf
    • https://cdn.shopify.com/s/files/1/0431/4251/2791/files/estado_civil_definicion.pdf
    • https://cdn.shopify.com/s/files/1/0433/8922/3066/files/niwiguvofaxupaxibepele.pdf
    • https://cdn.shopify.com/s/files/1/0440/1581/2766/files/80251972495.pdf
    • https://cdn.shopify.com/s/files/1/0431/2019/7781/files/woxiwo.pdf
    • https://cdn.shopify.com/s/files/1/0432/9334/3899/files/53293107781.pdf
    • https://cdn.shopify.com/s/files/1/0431/1236/6229/files/small_business_management_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/0061/7381/files/63913964560.pdf
    • https://cdn.shopify.com/s/files/1/0433/3630/2750/files/bebefeg.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_off00005cd3.bin
56cf679dacbbbfb306907e51a9cf4bd49d191388221557210d0fbdef101908a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CD3 5400 bytes
font_01_sfnt_off00006f1f.bin
b5a64ee809606bca9090c8263d6b815485b0e11092fb0050648b2ee24395a002		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F1F 10276 bytes

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