Malicious PDF — malware analysis report

Static analysis result for SHA-256 c40a839611b6ef23…

MALICIOUS

PDF

43.4 KB Created: 2020-08-23 14:01:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 53fb132ca45f88fa11f541e4a9553830 SHA-1: 4586816a432f4a697b4a9baed4996c777d76d92e SHA-256: c40a839611b6ef23303e0defb672fb3e114ef5058eaa8f1e76deb48036c8f3b5
120 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a critical heuristic firing for a malicious redirector. The primary malicious URL identified is https://ttraff.ru/pify?keyword=kindergarten+number+worksheets+free, which is likely used to redirect users to further malicious content. The document body, though heavily obfuscated, contains references to this URL and other benign-looking Shopify links, suggesting a lure to disguise the malicious intent. No scripts were extracted from this sample.

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.ru/pify?keyword=kindergarten+number+worksheets+free
    • http://files.amyandrewsmusic.com/uploads/1/3/1/0/131070402/87588.pdf
    • http://files.pumpkincurioushistory.com/uploads/1/3/2/6/132682826/1087e0b87d3111.pdf
    • http://soxoki.bendbeeryoga.com/uploads/1/3/0/7/130739297/4982556.pdf
    • https://cdn.shopify.com/s/files/1/0430/5790/5818/files/wixalozed.pdf
    • https://cdn.shopify.com/s/files/1/0433/8502/8758/files/53067577947.pdf
    • https://cdn.shopify.com/s/files/1/0435/4146/3204/files/753629054.pdf
    • https://cdn.shopify.com/s/files/1/0463/4198/0317/files/android_accelerometer_speed_example.pdf
    • https://cdn.shopify.com/s/files/1/0432/7230/6846/files/1993379255.pdf
    • https://cdn.shopify.com/s/files/1/0434/2854/4668/files/features_of_neoclassical_poetry.pdf
    • https://cdn.shopify.com/s/files/1/0431/5004/9446/files/laxod.pdf
    • https://cdn.shopify.com/s/files/1/0433/4059/5355/files/84473501002.pdf
    • https://cdn.shopify.com/s/files/1/0430/0469/0581/files/82781097410.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/
    • https://cdn.shopify.com/s/files/1/0435/4146

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b0b.bin
88138a7a785bbd0a55b18b27479abb21eff70e31a9f59341581aa7895b45f52e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B0B 5552 bytes
font_01_sfnt_off00007dc6.bin
5f59e21b984a68ba8786b04a8ca6bcd5278dff53770af8c278aca0f6bde46144		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DC6 10120 bytes

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