Malicious PDF — malware analysis report

Static analysis result for SHA-256 91e2b6b85738c1d4…

MALICIOUS

PDF

42.7 KB Created: 2020-08-17 14:30:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c06721e6f726176efdc7190a7a6c7cc5 SHA-1: bb39bac6b7d7846828fca250e4c93840fd4d1872 SHA-256: 91e2b6b85738c1d430b575c2c36d1bf7f10abb2a5d819a3ef3a24bcca61f5a94
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link pointing to 'ttraff.ru'. The document body, though heavily obfuscated, contains references to sheet music and the malicious URL, suggesting a lure. The presence of numerous external PDF links, many hosted on Shopify, indicates a link farm strategy, likely to improve SEO for malicious content or to obscure the true destination. The ML classifier strongly supports the malicious nature of this PDF.

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.ru/pify?keyword=alessio+bax+sheet+music
    • http://vumilak.springsteched.net/uploads/1/3/0/8/130814124/bipaxoper.pdf
    • https://cdn.shopify.com/s/files/1/0434/4630/4920/files/dinikatitabepe.pdf
    • https://cdn.shopify.com/s/files/1/0430/0144/6554/files/4756610155.pdf
    • https://cdn.shopify.com/s/files/1/0436/1102/9667/files/fashion_trend_report_2019.pdf
    • https://cdn.shopify.com/s/files/1/0435/7003/6904/files/how_to_reboot_echo_dot.pdf
    • https://cdn.shopify.com/s/files/1/0430/5335/1066/files/50_challenging_algebra_problems_fully_solved.pdf
    • https://cdn.shopify.com/s/files/1/0431/8245/7000/files/13229685774.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/70934180934.pdf
    • https://cdn.shopify.com/s/files/1/0431/1603/6249/files/76758907819.pdf
    • https://cdn.shopify.com/s/files/1/0431/6528/6566/files/99192064422.pdf
    • https://cdn.shopify.com/s/files/1/0433/7578/8188/files/95842594583.pdf
    • https://cdn.shopify.com/s/files/1/0434/5495/5672/files/jevoxozapotifugabosidin.pdf
    • https://cdn.shopify.com/s/files/1/0432/7853/2758/files/58767784346.pdf
    • https://cdn.shopify.com/s/files/1/0430/4273/4229/files/punctuating_dialogue_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0429/8906/0259/files/35999469649.pdf
    • https://cdn.shopify.com/s/files/1/0433/2060/6885/files/76971360346.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_off000069a0.bin
d11454c3014fd226b3ce9832b7bd8bb9f82e5ee40e50fe65502f05eb51a36df2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69A0 5140 bytes
font_01_sfnt_off00007afd.bin
27396c9497ff1bd39a1833809fa7f11b9c3d13967d5934e5c36ba91f725e5c77		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AFD 10280 bytes

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