Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d91a38b7a12b6b0…

MALICIOUS

PDF

39.8 KB Created: 2020-08-07 22:11:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b691548c51d1e1810339dccc506a4fe1 SHA-1: 6e4d8155efed2c1af78daf884f3ed835cb89c9de SHA-256: 8d91a38b7a12b6b02466c37b15b3b05a701547d24e0f5d73bec39b32bbabefd2
150 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with a critical heuristic firing for a malicious redirector. The primary malicious URL, 'https://ttraff.cc/pify?keyword=alphabet+chart+pdf', is designed to redirect users to potentially harmful content. The document body, though heavily obfuscated, contains references to the malicious URL and numerous other Shopify-hosted PDF links, suggesting a link farm or SEO poisoning tactic to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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=alphabet+chart+pdf
    • http://kejikulu.travisfootball.com/uploads/1/3/0/7/130775169/gobuxogenogoxolefe.pdf
    • http://files.haciendasonoma.com/uploads/1/3/2/7/132740218/7130198.pdf
    • http://files.johnnybartz.com/uploads/1/3/1/3/131381067/pisodafuzufu.pdf
    • https://cdn.shopify.com/s/files/1/0430/4168/5665/files/45943416628.pdf
    • https://cdn.shopify.com/s/files/1/0433/7808/1959/files/baruzokave.pdf
    • https://cdn.shopify.com/s/files/1/0429/5157/3657/files/wuxokugirasidolixejeno.pdf
    • https://cdn.shopify.com/s/files/1/0427/4746/1788/files/38975793415.pdf
    • https://cdn.shopify.com/s/files/1/0430/0649/2823/files/82644046463.pdf
    • https://cdn.shopify.com/s/files/1/0434/2795/4854/files/merge_multiple_files_foxit_reader.pdf
    • https://cdn.shopify.com/s/files/1/0430/6989/8909/files/manisogegisaminopunugu.pdf
    • https://cdn.shopify.com/s/files/1/0429/8070/4405/files/nukuniwotuzebovozi.pdf
    • https://cdn.shopify.com/s/files/1/0430/3339/5351/files/kimadij.pdf
    • https://cdn.shopify.com/s/files/1/0440/6778/2808/files/how_to_edit_a_large_file_for_free.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_off00005e4e.bin
724d4effb558451bac6623c5ade8b4fe0324b076a6a955179fc98b83f9d34ba5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E4E 5192 bytes
font_01_sfnt_off00006feb.bin
ab8e01d0aefb0a84c31639570ec910e11c4a034f0dc7788feaeaf8c4cd7b1944		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FEB 10192 bytes

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