Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8597e7102694376…

MALICIOUS

PDF

54.7 KB Created: 2020-08-20 07:24:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 850747e0ee828638e9caaef1c84fee83 SHA-1: 28ef1b1cbfa7a7030f95463c660ccc389e85aee2 SHA-256: e8597e7102694376a12f0c43d2cb0ea5f92e00832af6c8e0e0a8f11cf478f351
120 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm for SEO manipulation or to obscure the true malicious destination. One critical heuristic firing indicates a direct link to known malicious redirector infrastructure at `https://ttraff.cc/pify?keyword=harvard+reference+style`. This URL is the primary IOC, as it is designed to redirect the user to further malicious content. The document body, though partially garbled, contains the text 'Harvard reference style' and the malicious URL, reinforcing the lure.

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=harvard+reference+style
    • http://files.gemscorner.org/uploads/1/3/0/7/130775905/d0d68910.pdf
    • https://cdn.shopify.com/s/files/1/0429/5258/9465/files/55713649992.pdf
    • https://cdn.shopify.com/s/files/1/0436/5592/1817/files/wigagaroxar.pdf
    • https://cdn.shopify.com/s/files/1/0439/4939/2030/files/38965520265.pdf
    • https://cdn.shopify.com/s/files/1/0435/3546/6655/files/gukevazenumotikuzoralo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/87967576867.pdf
    • https://cdn.shopify.com/s/files/1/0428/2905/4118/files/37273353201.pdf
    • https://cdn.shopify.com/s/files/1/0431/6597/4690/files/17413989621.pdf
    • https://cdn.shopify.com/s/files/1/0440/3465/4358/files/adjectives_adverbs_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0439/0171/4587/files/40275832908.pdf
    • https://cdn.shopify.com/s/files/1/0431/7279/0421/files/90844536026.pdf
    • https://cdn.shopify.com/s/files/1/0434/3287/0037/files/97762222687.pdf
    • https://cdn.shopify.com/s/files/1/0428/5690/6918/files/35797206225.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_off0000992c.bin
96e792395df5733017399de77b4e7438f8931929f414782802ffb0e912f16f5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x992C 5136 bytes
font_01_sfnt_off0000aabe.bin
fbf7955cf97b5f60bca50178c1b3f6576aa9db96e4c06b1af890a660ce46cb84		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAABE 10404 bytes

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