Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e42c2c253a61278…

MALICIOUS

PDF

34.2 KB Created: 2020-08-15 15:21:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8dd9098b297bb4ce84a300112e43d34a SHA-1: b73e678b1bcdda5a89aee27fba1207d1af5cde8c SHA-256: 9e42c2c253a61278be3c5b7fa08a0edbec5aab719037a74e95c5a6d20ee3eb2e
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a heuristic firing for a malicious redirector link, directing users to a URL disguised as a worksheet answer key. The document body, though heavily obfuscated, contains the same URL and references to 'wkhtmltopdf', suggesting it's a lure. The presence of numerous embedded URLs, many pointing to Shopify, indicates a link farm strategy to obscure the malicious destination. The primary malicious URL is https://ttraff.cc/wb?keyword=worksheet%203.3%20graphing%20and%20solving%20systems%20of%20linear%20inequalities%20answers.

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/wb?keyword=worksheet%203.3%20graphing%20and%20solving%20systems%20of%20linear%20inequalities%20answers
    • http://files.theredroomproject.com/uploads/1/3/1/0/131070559/9294c2cd.pdf
    • http://files.cattd.com/uploads/1/3/1/4/131438203/selumudeduxip.pdf
    • https://cdn.shopify.com/s/files/1/0438/8998/3643/files/10661022091.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rasamonuje.pdf
    • https://cdn.shopify.com/s/files/1/0431/2439/2087/files/78471155325.pdf
    • https://cdn.shopify.com/s/files/1/0429/8883/0873/files/factors_affecting_antigen_antibody_reaction.pdf
    • https://cdn.shopify.com/s/files/1/0430/1576/6177/files/81892290162.pdf
    • https://cdn.shopify.com/s/files/1/0434/6406/5174/files/59378062885.pdf
    • https://cdn.shopify.com/s/files/1/0432/2128/7080/files/carnival_of_venice_piano.pdf
    • https://cdn.shopify.com/s/files/1/0429/2100/1119/files/33398533060.pdf
    • https://cdn.shopify.com/s/files/1/0433/4796/8149/files/zigoki.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nemubowakupupoda.pdf
    • https://cdn.shopify.com/s/files/1/0431/5784/8224/files/941_angel_number.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_off0000449a.bin
a574f7233489f3fedae1813067282d182f977c3fbafee34c92a7cbef16d9f81e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x449A 6108 bytes
font_01_sfnt_off00005962.bin
c3a748a6624dc1b55af4ff0ebf462fddf71a1ac3f4dc5bb7ded8e68aab634342		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5962 10068 bytes

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