Malicious PDF — malware analysis report

Static analysis result for SHA-256 73fc508a414e1b90…

MALICIOUS

PDF

39.2 KB Created: 2020-09-01 01:42:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3c5eba705b82efcd368e35d5838f9430 SHA-1: 0e9f8c940dc563b4f4a3b17a3897f8a4c709d46e SHA-256: 73fc508a414e1b90a86741ee878b8e6122b866e2558306bacb381795abc8878a
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains a URL that appears to be a lure for a 'compass manual'. Additionally, the PDF exhibits characteristics of a link farm, with numerous embedded URLs, many of which point to benign Shopify domains, but one critical link to a malicious redirector. The ML classifier also strongly flagged this PDF as malicious.

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.com/wix?keyword=azimuth+1000+compass+manual
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tovovowegafakaroseras.pdf
    • https://cdn.shopify.com/s/files/1/0428/2014/1223/files/81559145544.pdf
    • https://cdn.shopify.com/s/files/1/0433/9063/2101/files/birthday_cake_with_name_editor_app.pdf
    • https://cdn.shopify.com/s/files/1/0437/9531/6893/files/95089089029.pdf
    • https://static.usrfiles.com/ugd/e02969_951bcfdc6430476186ad0eb8b3701ff0.pdf
    • https://static.usrfiles.com/ugd/b8c837_a3e7be759fe04d28b8091b7f5141e79f.pdf
    • https://static.usrfiles.com/ugd/b8c837_07c683f01f4c44509e102f304d117095.pdf
    • https://static.usrfiles.com/ugd/f0f215_794dc8a83c6f4825b943dcacc9b4f94b.pdf
    • https://static.usrfiles.com/ugd/b8c837_1fa1999307e34e1d8877578b4a84ce5a.pdf
    • https://cdn.shopify.com/s/files/1/0430/4899/2922/files/96955478773.pdf
    • https://cdn.shopify.com/s/files/1/0441/1306/8184/files/37524186746.pdf
    • https://cdn.shopify.com/s/files/1/0431/0827/0244/files/71103001705.pdf
    • https://cdn.shopify.com/s/files/1/0434/1055/5041/files/tabel_nutrisi_hidroponik.pdf
    • https://cdn.shopify.com/s/files/1/0439/1839/3499/files/37942841088.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fakuwonilojovaxibudebu.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005971.bin
467f6565b6270e429ac3ea0a2f6e0a5f9615c1b04a97326cf2d9d0f0e3946b81		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5971 5312 bytes
font_01_sfnt_off00006b67.bin
1b13da8369eedf3dc7aa2b72e14962f6fece3ec63754c2c78f84a5dfd5f29688		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B67 10868 bytes

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