Malicious PDF — malware analysis report

Static analysis result for SHA-256 db31c5505ec237e6…

MALICIOUS

PDF

53.8 KB Created: 2020-08-03 23:34:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 94faa72e74fb73e54d71aed0bcb15571 SHA-1: b78c05598a4d30b2530cf7c68481cd850f39987a SHA-256: db31c5505ec237e667ece8ce1eb7be6d63b5ae9bff3462bbb5512391b31d3e24
120 Risk Score

Malware Insights

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

The PDF file contains a mass external link farm, with a critical heuristic firing for a malicious redirector. The primary malicious URL identified is https://ttraff.cc/pify?keyword=ielts+speaking+and+writing+corner+pdf, which is likely used to redirect users to further malicious content. The document body, though heavily obfuscated, contains references to IELTS study materials, suggesting a lure to entice users to click the malicious link.

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=ielts+speaking+and+writing+corner+pdf
    • http://files.thekindnesscouture.com/uploads/1/3/0/8/130813511/6316595.pdf
    • http://files.stephaniehays.com/uploads/1/3/1/3/131380845/923376.pdf
    • http://files.bechinatown.org/uploads/1/3/1/0/131070457/4362116.pdf
    • https://cdn.shopify.com/s/files/1/0431/6368/0929/files/24766862114.pdf
    • https://cdn.shopify.com/s/files/1/0437/8283/2280/files/puwekezitufemibuko.pdf
    • https://cdn.shopify.com/s/files/1/0429/1729/8329/files/13069159718.pdf
    • https://cdn.shopify.com/s/files/1/0429/7634/6266/files/16411454109.pdf
    • https://cdn.shopify.com/s/files/1/0437/8660/0609/files/81268687033.pdf
    • https://cdn.shopify.com/s/files/1/0437/6467/8807/files/liripomekamunugopamexa.pdf
    • https://cdn.shopify.com/s/files/1/0427/7298/8071/files/lejusirubafuvodidis.pdf
    • https://cdn.shopify.com/s/files/1/0431/2236/0469/files/setting_up_a_web_server.pdf
    • https://cdn.shopify.com/s/files/1/0430/7661/6341/files/car_body_repair_book.pdf
    • https://cdn.shopify.com/s/files/1/0440/1460/0342/files/liwovulameri.pdf
    • https://cdn.shopify.com/s/files/1/0431/5129/4619/files/93881029638.pdf
    • https://cdn.shopify.com/s/files/1/0432/5395/6758/files/bulomobaw.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_off000094a9.bin
dc0277c41da445aaf854470556474d95d59057068a5f3263a3fa15b8ca9e998d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94A9 5416 bytes
font_01_sfnt_off0000a73c.bin
f1ac5d207a86d3bef106a0475cadf131e90943eb1ecde0825325f6c6236a9e4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA73C 10528 bytes

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