Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8d4330418e47e52…

MALICIOUS

PDF

42.4 KB Created: 2020-08-30 21:24:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b1aef899ca1c326b0cede059e4d33fe3 SHA-1: 9382a444ba395c03473ce3e27e9ea151923da0c9 SHA-256: a8d4330418e47e524197bd723fa12c545443ba9c1eddd0a3403d82c3cb879f82
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wix?keyword=pacemaster+proselect+treadmill'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on 'static.usrfiles.com'. The document body, though heavily obfuscated, contains references to the redirector URL and other PDF links, suggesting a coordinated effort to direct users to malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious.

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/wix?keyword=pacemaster+proselect+treadmill
    • https://static.usrfiles.com/ugd/12f4eb_32e5451ee19b486c95ea30f71ede743a.pdf
    • https://static.usrfiles.com/ugd/b8c837_e74b192ddd1b4f3e8f1d9e7986e3cbf2.pdf
    • https://static.usrfiles.com/ugd/0f1814_5bf810fc5a434a47a5472e5b05060443.pdf
    • https://static.usrfiles.com/ugd/07ef24_06ed29a1812445138e1d106e819576dd.pdf
    • https://static.usrfiles.com/ugd/b8c837_dfe136bcdc9e448dbf4c3a112f7ebd87.pdf
    • https://static.usrfiles.com/ugd/b8c837_2c9b3ba46b3143a5a3cb622ac9fb4cc7.pdf
    • https://static.usrfiles.com/ugd/b8c837_c5751e6bda844f2b8fa809d0d9be069e.pdf
    • https://static.usrfiles.com/ugd/9b33c5_3e4d16fb6c3245e284ba40653b8c9830.pdf
    • https://static.usrfiles.com/ugd/5fd5c1_2b053c0d072e4a4ab746d43249c30df6.pdf
    • https://cdn.shopify.com/s/files/1/0467/5924/8035/files/82070708619.pdf
    • https://cdn.shopify.com/s/files/1/0429/2804/6233/files/41371662141.pdf
    • https://cdn.shopify.com/s/files/1/0435/4444/5092/files/juice_recipes_book.pdf
    • https://cdn.shopify.com/s/files/1/0434/0563/9836/files/global_ecological_footprint.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_off00006752.bin
f6c83895ca48cf040ccd2f745da405142ce5cc6067b4ff24c05cf2fb5de9a8a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6752 5220 bytes
font_01_sfnt_off000078ef.bin
cbd66eb27bb0d8a4f6ec85f0eb474da66d4da96d899987e568e947a5534c93f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78EF 10600 bytes

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