Malicious PDF — malware analysis report

Static analysis result for SHA-256 1599fe820f760404…

MALICIOUS

PDF

52.2 KB Created: 2020-09-01 16:33:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ae08d7fbbcefd9f4da750a5b8bef0d1b SHA-1: e9d1cb269e7e6904b3ab021da899d2b2b10e8bc2 SHA-256: 1599fe820f760404b6e3699109df6ce2f1f8db7de3c97d2da1b275e9b82dca2b
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm designed to distribute traffic. One prominent URL, 'https://ttraff.cc/wix?keyword=fisher%2527+s+exact+test+reporting', is identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'Fisher's exact test reporting' and the tool 'wkhtmltopdf', suggesting a lure to disguise the malicious intent. The presence of embedded URLs and the link farm structure strongly indicate a phishing or redirection attempt.

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=fisher%2527+s+exact+test+reporting
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/455f95_d0874e72e31d4d1fb2da1df5de2d871d.pdf
    • https://static.usrfiles.com/ugd/1cfe37_21f4baa250484c2bafca0a6039c5afd1.pdf
    • https://static.usrfiles.com/ugd/b8c837_0a099aa030a84d0eb09d07f9fefb500f.pdf
    • https://cdn.shopify.com/s/files/1/0437/7319/8497/files/gavomupozixar.pdf
    • https://cdn.shopify.com/s/files/1/0436/1807/4786/files/85585173794.pdf
    • https://cdn.shopify.com/s/files/1/0437/0422/1849/files/fiwujuxebusolu.pdf
    • https://static.usrfiles.com/ugd/b8c837_a6ed77a08ea746e39774dbfc7ea47fd7.pdf
    • https://static.usrfiles.com/ugd/a01749_fa480f4be38e49f6a36930d374542035.pdf
    • https://static.usrfiles.com/ugd/b8c837_64f0dd99f05a4b548b776fd9b4b409ed.pdf
    • https://static.usrfiles.com/ugd/b8c837_550f68f02b6f4b3cba9e291ed6ac1e45.pdf
    • https://static.usrfiles.com/ugd/3e9e83_f2ce8daed01848e29dca6020eb440860.pdf
    • https://static.usrfiles.com/ugd/b8c837_64df84e35a654103865d3f2689747e08.pdf
    • https://static.usrfiles.com/ugd/599026_4c1136bf3f964f28b8f3fcfe97666751.pdf
    • https://static.usrfiles.com/ugd/b8c837_7094a8965da7427196345dcf8399505a.pdf
    • https://static.usrfiles.com/ugd/67e251_ae11813ebaff4915a0f7317f8555441d.pdf
    • https://static.usrfiles.com/ugd/b8c837_a1e84343a25045e0af5817545cbc537a.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_off00008dcb.bin
d564ba4c92cc67d48dc60848d7771a70fdba98352c6b1697cbbbbc2eff01f5f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DCB 5220 bytes
font_01_sfnt_off00009f96.bin
78a9cbdce39b553f27a30d6f663b4c452ec0d44d88cbc2a741f2f5c32dcdc7e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F96 10660 bytes

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