Malicious PDF — malware analysis report

Static analysis result for SHA-256 740f22cac1cf2740…

MALICIOUS

PDF

42.0 KB Created: 2020-08-30 08:14:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: acdb43c84fd62fc854b097d3060c4032 SHA-1: f6d27ed34ecd02a6a59ab598d6bcea0e8f73b301 SHA-256: 740f22cac1cf2740d9d23a6f90be828eef8f09e603ec1bd1e26c31f3cd012cf8
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one critical heuristic identifying it as a malicious redirector pointing to 'https://ttraff.cc/wix?keyword=realtek+11n+usb+wireless+lan+utility'. Another heuristic indicates a link farm structure with numerous external PDF links. The document body, though heavily obfuscated, contains the same malicious URL and several benign-looking Shopify URLs, suggesting a lure to download a utility which likely leads to a malicious payload. No scripts were extracted, but the presence of malicious links and the ML classifier output strongly indicate 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.cc/wix?keyword=realtek+11n+usb+wireless+lan+utility
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/5475/9069/files/duwepuji.pdf
    • https://cdn.shopify.com/s/files/1/0432/5657/8212/files/32432473695.pdf
    • https://cdn.shopify.com/s/files/1/0427/5381/8790/files/algebraic_identities_formulas.pdf
    • https://cdn.shopify.com/s/files/1/0431/6869/4432/files/semonunapavilosunus.pdf
    • https://cdn.shopify.com/s/files/1/0428/5900/4070/files/47143490263.pdf
    • https://static.usrfiles.com/ugd/bdeb4c_e805fd4e259b46b395c90bef85c9e1bb.pdf
    • https://static.usrfiles.com/ugd/bf650e_c60f6a9f9a074697911eaaa2a9bde9dd.pdf
    • https://static.usrfiles.com/ugd/2ac701_3db45a7c1ecb426797c792222353edf4.pdf
    • https://static.usrfiles.com/ugd/7baf93_e45c17b010e0461eb7ff06d2dd78ad6c.pdf
    • https://static.usrfiles.com/ugd/b8c837_43cabd81d54c4facb12ee260030d307f.pdf
    • https://cdn.shopify.com/s/files/1/0432/0201/9487/files/12341138666.pdf
    • https://cdn.shopify.com/s/files/1/0438/9725/8136/files/nazafobojegiwaxut.pdf
    • https://cdn.shopify.com/s/files/1/0431/1734/6965/files/94867162910.pdf
    • https://cdn.shopify.com/s/files/1/0436/2059/7923/files/ancient_greek_mythology_stories.pdf
    • https://static.usrfiles.com/ugd/3aca14_6eeeb72611a64507aad339a710b9778d.pdf
    • https://static.usrfiles.com/ugd/e1d12c_8ce0e087761e4cd3a415765e5d924ab6.pdf
    • https://static.usrfiles.com/ugd/10e3af_3703554b78be481b8c95d4e21971d190.pdf
    • https://static.usrfiles.com/ugd/b8c837_4b5dd9cdd6584393835540a1e9ad4517.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_off0000667e.bin
d54287b5abecc5f11a3b9ea685ee82014870ea6f51855c4e371cffe9667ff58a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x667E 5136 bytes
font_01_sfnt_off00007824.bin
6c7b7308b7f92e476ce1e3071ab6ef4b384bce94adfdf56b225551e0a93488cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7824 10260 bytes

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