Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbe10282b28b7b8f…

MALICIOUS

PDF

37.7 KB Created: 2020-08-30 10:25:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b7bc1f6aa77e5d20b7b2a848b28b6821 SHA-1: 843919c0896e341d9afe38fe2e804b1e8ce5003b SHA-256: fbe10282b28b7b8f269cdef0d9134532e2aaed4de2f1b06110e9fd2570f41db9
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, specifically pointing to a URL designed to lure users with the promise of 'unblocked games'. The document body, though heavily obfuscated, also contains this URL. The presence of numerous external links, many pointing to static.usrfiles.com, suggests a link farm strategy to improve search engine visibility for malicious content. 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.cc/wix?keyword=unblocked+games+66+strike+force+heroes
    • https://static.usrfiles.com/ugd/314c35_fe47585580b1406a8478876182f1d3b2.pdf
    • https://static.usrfiles.com/ugd/253000_3d02e877e6e54e53a6e26940f2cae6bb.pdf
    • https://static.usrfiles.com/ugd/804ff6_61f4dde3ef0a4a989f141b11736d25b5.pdf
    • https://static.usrfiles.com/ugd/c618e9_85df16cffd384e229c321d0cd89e82f5.pdf
    • https://static.usrfiles.com/ugd/67f5f7_1e79f8e36802432689b475c3ed6d5645.pdf
    • https://static.usrfiles.com/ugd/b8c837_10ef68244060448abd7ba5d1a41ddbec.pdf
    • https://static.usrfiles.com/ugd/accd1f_ecabddcb736547cc90217a0af1279dee.pdf
    • https://static.usrfiles.com/ugd/d43733_1f74ae8696ef48088edebebda7a471b5.pdf
    • https://static.usrfiles.com/ugd/b8c837_368acbcc35ed4116b2c9c9ddc8986b48.pdf
    • https://static.usrfiles.com/ugd/299074_5169281bed8b4b3284497ecbe2684e52.pdf
    • https://cdn.shopify.com/s/files/1/0434/4836/9309/files/dafapukufak.pdf
    • https://cdn.shopify.com/s/files/1/0428/9685/1103/files/37765182128.pdf
    • https://cdn.shopify.com/s/files/1/0440/5306/9974/files/the_very_hungry_caterpillar_coloring_book.pdf
    • https://cdn.shopify.com/s/files/1/0429/7234/8579/files/guwatorafujokujodazuniwux.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_off0000540b.bin
380f50663476ac522afba7eb3d2305d65b3c5361ea5504400d5158a5b02e7a8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x540B 5784 bytes
font_01_sfnt_off00006789.bin
f9c35d32375ec517d67708e5b523ba8591436a88235050f42173919374a2fb32		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6789 10204 bytes

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