Malicious PDF — malware analysis report

Static analysis result for SHA-256 66a8092c0ff449a3…

MALICIOUS

PDF

47.5 KB Created: 2020-07-28 06:10:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21a82bb061e48ddaf958268456aee3bc SHA-1: 865a2e034034dd13ec9db156c5ff65d9ffb7023b SHA-256: 66a8092c0ff449a38ea480fb9a774c62e616e6b12cdd6d4f4cf43bd7bb4560bb
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 redirector service (ttraff.ru) and are likely part of a link farm or SEO poisoning scheme. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content, potentially for phishing or malware distribution.

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/pify?keyword=attacking+faulty+reasoning+answers
    • http://files.netliveseminars.org/uploads/1/3/0/7/130775229/jejula_jivunuke.pdf
    • http://files.teacherkitty.com/uploads/1/3/1/4/131483201/1805320.pdf
    • http://files.sydneyruby.com/uploads/1/3/1/4/131437453/zivekedojepujomina.pdf
    • http://files.barcelonaappartement.com/uploads/1/3/1/0/131069886/wemamapukulo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/8475/0743/files/97613431838.pdf
    • https://cdn.shopify.com/s/files/1/0433/2853/6744/files/kusixipedewoberi.pdf
    • https://cdn.shopify.com/s/files/1/0433/7310/1219/files/xasoxev.pdf
    • https://cdn.shopify.com/s/files/1/0434/5279/2982/files/9827963228.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rixiridujafogidubiba.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/41448402009.pdf
    • https://cdn.shopify.com/s/files/1/0432/3590/1602/files/pelafiv.pdf
    • https://cdn.shopify.com/s/files/1/0430/1278/4277/files/75847309826.pdf
    • https://cdn.shopify.com/s/files/1/0434/5335/0053/files/fodimajuluneveza.pdf
    • https://cdn.shopify.com/s/files/1/0431/8475/0747/files/nubasumipidomas.pdf
    • https://cdn.shopify.com/s/files/1/0436/6653/8649/files/40751660362.pdf
    • https://cdn.shopify.com/s/files/1/0432/4560/0931/files/210532528.pdf
    • https://cdn.shopify.com/s/files/1/0427/9212/4572/files/wududa.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_off00007c58.bin
163c9cbd0f01a6c9f4a28221f195d81a60d95e1a66dd483798dfca9305f77132		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C58 5176 bytes
font_01_sfnt_off00008e1a.bin
ac44d6014e1e21e485bd23cf25ee6ff85003bf38c60179891249b003e6499688		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E1A 9924 bytes

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