Malicious PDF — malware analysis report

Static analysis result for SHA-256 6db8eef57fecd59f…

MALICIOUS

PDF

58.5 KB Created: 2020-08-31 10:56:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 75af3e66b56f2a71f141b3b9b9d2793f SHA-1: 16c0c8bd265a382ed66c5a96d225c49dae6ae303 SHA-256: 6db8eef57fecd59f688b87dd5324dc4119d056abddd90ebbb3671a85c03b2114
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating it points to known malicious infrastructure. Additionally, PDF_SEO_LINK_FARM indicates a large number of external links, many of which are PDFs, suggesting a link farm or redirection scheme. The ML classifier also strongly flagged this PDF as malicious. The embedded URL https://ttraff.ru/wix?keyword=gyakkyou+burai+kaiji+ultimate+surviv is the primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=gyakkyou+burai+kaiji+ultimate+surviv
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/d775a9_1069ec3568ea418b848457d0dc0ef97d.pdf
    • https://static.usrfiles.com/ugd/b8c837_63f930eeefe54607b2a09fbba739838f.pdf
    • https://static.usrfiles.com/ugd/760101_7c05530e1d53451eabb338a7a5e36668.pdf
    • https://static.usrfiles.com/ugd/b4a829_8929da4a4f8d40bfbe440a1fc33c45e4.pdf
    • https://static.usrfiles.com/ugd/33c377_f370107607ff418397cf4f9c86d55a2b.pdf
    • https://cdn.shopify.com/s/files/1/0427/5326/1724/files/44073421301.pdf
    • https://static.usrfiles.com/ugd/c0b427_3ce944b67c224de09963abfe4e015e9a.pdf
    • https://static.usrfiles.com/ugd/238140_cb9d1c0ddefc4d8883e8b453745145d7.pdf
    • https://static.usrfiles.com/ugd/83b1b3_4f64ab3460dd4020a303ed6c790627b7.pdf
    • https://static.usrfiles.com/ugd/b8c837_d78f471f79da4167b0a7e9953e87252a.pdf
    • https://static.usrfiles.com/ugd/4bdc6d_3ca890175bb549a0a61254c8e84383f2.pdf
    • https://cdn.shopify.com/s/files/1/0428/7938/5766/files/juzipibefasezikaduvuxadeg.pdf
    • https://cdn.shopify.com/s/files/1/0433/0645/1094/files/93502393137.pdf
    • https://cdn.shopify.com/s/files/1/0428/0962/2687/files/radutu.pdf
    • https://cdn.shopify.com/s/files/1/0427/9658/1020/files/bibenubim.pdf
    • https://cdn.shopify.com/s/files/1/0428/5032/0543/files/wogiwabemojukiruruzojuzul.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009332.bin
ffef10684bf1ab1b44e6d108f8f01a527eef3494199436e84515b965804780b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9332 5664 bytes
font_01_sfnt_off0000a6ad.bin
81b4f0b6d68508dc11e1780a1f12eda5c65735f54e4c83d8a76ef1b4d75d655f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA6AD 5304 bytes
font_02_sfnt_off0000b8ba.bin
b27685384177fcb2e6bbe742d40ea857bc9a72ea263648e151a93f86aee4bc8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB8BA 10508 bytes

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