Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf459d31ecc0c1a9…

MALICIOUS

PDF

40.8 KB Created: 2020-08-29 05:51:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a0afdc38927a2dd073854d733612b79e SHA-1: 76031077614f74e8a3c60d1becd5b06fe2a92746 SHA-256: bf459d31ecc0c1a9a7aff2aeaf20da837e68dd4cb7d7c9fedeb1278edcf3fcd0
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.com/wix?keyword=guion+literario+ejemplo'. Additionally, it exhibits characteristics of a PDF link farm, with numerous links to external PDFs hosted on Shopify. The ML classifier also strongly flagged this PDF as malicious. The primary attack vector appears to be luring users to malicious infrastructure via embedded links.

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.com/wix?keyword=guion+literario+ejemplo
    • https://cdn.shopify.com/s/files/1/0432/9802/9733/files/77294633775.pdf
    • https://cdn.shopify.com/s/files/1/0447/9864/0288/files/atp_challenger_tour_calendar.pdf
    • https://cdn.shopify.com/s/files/1/0429/3305/9737/files/convert_ke_word_i_love.pdf
    • https://cdn.shopify.com/s/files/1/0434/3103/5032/files/88357597415.pdf
    • https://cdn.shopify.com/s/files/1/0430/3529/5905/files/pepurenoweralibebu.pdf
    • https://cdn.shopify.com/s/files/1/0449/0782/3259/files/class_10_biology_control_and_coordination_notes_download.pdf
    • https://cdn.shopify.com/s/files/1/0452/1204/1367/files/96316441596.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/26443777516.pdf
    • https://cdn.shopify.com/s/files/1/0434/1619/1138/files/balancing_chemical_equations_lab_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0434/5603/7017/files/79777613072.pdf
    • https://cdn.shopify.com/s/files/1/0432/0008/6180/files/penanupa.pdf
    • https://cdn.shopify.com/s/files/1/0431/7793/5004/files/dd_wrt_r7000.pdf
    • https://static.usrfiles.com/ugd/b8c837_abcab7a19a8c4699a21332e1b0c55be5.pdf
    • https://static.usrfiles.com/ugd/b8c837_dae1bd802cad410798314ff888dec8cf.pdf
    • https://static.usrfiles.com/ugd/b8c837_45f7ed31920c4654a82a8a0a1d4fe854.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_off00005ecd.bin
ed2a48dd22647ec6bbc886d3ddcf7226be9cd16d03f0e017eada51beb9f85d33		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5ECD 4896 bytes
font_01_sfnt_off00006f64.bin
a0a75cdfecdc9d32847421b141af0db47095000eda24ac7268fc3a93988cb407		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F64 11652 bytes

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