Malicious PDF — malware analysis report

Static analysis result for SHA-256 df564a8957b0eb05…

MALICIOUS

PDF

68.0 KB Created: 2020-08-31 08:46:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3c9b1713873eeb7ed9be5b0baef46a0c SHA-1: 7e64fffa8a81e265004b5d19bd97dc886e994cfb SHA-256: df564a8957b0eb0579736fc3759175b93e6dd80537aaa5491da3580be91b148b
120 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.com/wix?keyword=ielts+writing+task+2+with+answers+pd'. This URL is likely used to redirect users to a malicious site. The document body, though heavily obfuscated, also contains this URL and references to other PDF files, suggesting a link farm or redirection strategy. The presence of numerous external PDF links, many hosted on 'static.usrfiles.com', further supports the redirection and potential SEO poisoning attack pattern.

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=ielts+writing+task+2+with+answers+pd
    • https://static.usrfiles.com/ugd/a31856_e1ca6fc1c3794ac8b5b67d503b599e02.pdf
    • https://static.usrfiles.com/ugd/5af86b_d4a4f5075d604c4ca2ffe27e38e6cbc7.pdf
    • https://static.usrfiles.com/ugd/ea2f88_fbf62138f9dd451c918bb68d32a66d72.pdf
    • https://static.usrfiles.com/ugd/b8c837_8d791ac1433d47b5ae15dd4042e1d47c.pdf
    • https://cdn.shopify.com/s/files/1/0434/0996/5212/files/business_administration_course.pdf
    • https://static.usrfiles.com/ugd/b8c837_fa32e7286ed54b8caacc51df05390803.pdf
    • https://static.usrfiles.com/ugd/451461_2d2172fcce8e4066ae3930def75f2244.pdf
    • https://static.usrfiles.com/ugd/7baf93_56846381fbdf48139758e2755c3a7cc0.pdf
    • https://cdn.shopify.com/s/files/1/0438/5298/8566/files/landing_page_optimization_book.pdf
    • https://cdn.shopify.com/s/files/1/0427/7505/2454/files/wiper_blade_size_chart.pdf
    • https://cdn.shopify.com/s/files/1/0434/8153/0534/files/batman_vs_superman_movie_isaidub.pdf
    • https://cdn.shopify.com/s/files/1/0432/7899/1520/files/20266740389.pdf
    • https://cdn.shopify.com/s/files/1/0436/9163/8934/files/how_to_use_pkhex_without_homebrew.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_off0000cd5e.bin
8f2b3fcb71108ae9dca649404ba854f7d7a1e455bfa815a4abeb13e24e9a7434		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD5E 5444 bytes
font_01_sfnt_off0000dfe7.bin
54581dde04e20981d96d996f0edd977ca7bdb620fe622a8c62d998453a557801		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE7 10432 bytes

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