Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b84d377b876faed…

MALICIOUS

PDF

41.8 KB Created: 2020-08-02 23:42:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6699d4c2b0dbdc77ff6558c042b2cf76 SHA-1: 4bcabd547e5f74977e465e27e9d63a67e58fbf16 SHA-256: 7b84d377b876faed8d3a2d7bc6674be72b217821fea483f5e0f8582e52d2e660
120 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which are SEO-optimized and point to PDF files. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is used to obscure the final destination. The document body, though heavily obfuscated, contains text related to 'sbac practice test 5th grade math pdf' and the malicious URL, suggesting a lure to trick users into clicking the link. The presence of numerous Shopify-hosted PDFs indicates a potential link farm used for SEO poisoning or distributing 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.cc/wb?keyword=sbac%20practice%20test%205th%20grade%20math%20pdf
    • http://files.tickettoridegreatloop.com/uploads/1/3/0/7/130775786/zezikuzav.pdf
    • http://files.furiousdaysk9.com/uploads/1/3/1/0/131070713/bae9a18ea0e0.pdf
    • http://files.shauneb.co.uk/uploads/1/3/0/7/130776254/483066.pdf
    • http://files.shoshoneriverfarm.com/uploads/1/3/1/6/131606550/2616268.pdf
    • http://files.praisenyc.com/uploads/1/3/2/3/132302732/ad19df6df4c.pdf
    • https://cdn.shopify.com/s/files/1/0440/9750/3384/files/jenofilusapokipumaseja.pdf
    • https://cdn.shopify.com/s/files/1/0431/4379/0760/files/xoxeke.pdf
    • https://cdn.shopify.com/s/files/1/0434/4800/8866/files/gipadesufuwonowidiz.pdf
    • https://cdn.shopify.com/s/files/1/0439/2534/0328/files/19617103581.pdf
    • https://cdn.shopify.com/s/files/1/0438/6072/1829/files/supepitiguf.pdf
    • https://cdn.shopify.com/s/files/1/0437/8106/2805/files/minecraft_eu_to_rf.pdf
    • https://cdn.shopify.com/s/files/1/0431/3314/1149/files/minegavepalat.pdf
    • https://cdn.shopify.com/s/files/1/0430/8851/1130/files/soluputalunisajerewazij.pdf
    • https://cdn.shopify.com/s/files/1/0433/4557/6088/files/6990242988.pdf
    • https://cdn.shopify.com/s/files/1/0427/8072/1311/files/18569348807.pdf
    • https://cdn.shopify.com/s/files/1/0431/0673/0138/files/11096320207.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_off0000648b.bin
ec502c7e6a57a335dd2b350976bcbab9b3e0b7ef413d22a3a77b3dc0d6a2b840		 pdf-font-stream PDF embedded font (sfnt) at offset 0x648B 5904 bytes
font_01_sfnt_off00007874.bin
bb6eddb810db63145ece4b286184c9011adeb313041a79232355e38b1e851df7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7874 9836 bytes

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