Malicious PDF — malware analysis report

Static analysis result for SHA-256 75b57922f094d8f4…

MALICIOUS

PDF

49.8 KB Created: 2020-07-19 02:42:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1bf0592f2632ce1154ae90c84a4cb655 SHA-1: 322c434858233782f8ef454b65f16954c959d514 SHA-256: 75b57922f094d8f4cb19174ac8e1a534f80e7e196f30f44de9556804ee4a42c9
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 Shopify domains hosting other PDFs, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure (ttraff.ru), indicating a potential phishing or malware distribution attempt. 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.ru/wb?keyword=interrupts%20in%20embedded%20systems%20pdf
    • http://files.pretzelathletics.com/uploads/1/3/0/7/130776341/d8979a7.pdf
    • http://files.artemleaders.com/uploads/1/3/0/8/130815437/56e41c74761eb59.pdf
    • http://files.masonscience8.com/uploads/1/3/2/7/132712530/vanupiva.pdf
    • http://files.hempourfuture.com/uploads/1/3/1/3/131398574/kitukotevudosuman.pdf
    • http://files.markmarinozzi.com/uploads/1/3/1/4/131454172/2f26df15e8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/4317/6091/files/5024360099.pdf
    • https://cdn.shopify.com/s/files/1/0429/3551/7337/files/46724904675.pdf
    • https://cdn.shopify.com/s/files/1/0434/4047/2214/files/wijitawolinasujo.pdf
    • https://cdn.shopify.com/s/files/1/0430/3015/1330/files/91530525604.pdf
    • https://cdn.shopify.com/s/files/1/0430/7861/5189/files/vebakowibefos.pdf
    • https://jajedivetet.files.wordpress.com/2020/07/15534254629.pdf
    • https://kogezes.files.wordpress.com/2020/06/zulesupusokekasimizez.pdf
    • https://batateja.files.wordpress.com/2020/06/1570310605.pdf
    • https://roropebuj.files.wordpress.com/2020/06/daragafilegajorom.pdf
    • https://cdn.shopify.com/s/files/1/0434/2359/6693/files/19491986521.pdf
    • https://cdn.shopify.com/s/files/1/0429/7729/6543/files/telokelovosi.pdf
    • https://cdn.shopify.com/s/files/1/0430/6285/3794/files/24367164382.pdf
    • https://cdn.shopify.com/s/files/1/0430/4899/2930/files/83847838063.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/43778875991.pdf
    • https://cdn.shopify.com/s/files/1/0430/3529/5905/files/10406898395.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kefemomorevogik.pdf
    • https://cdn.shopify.com/s/files/1/0435/2763/5096/files/29472661952.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_off00007ac2.bin
fd45fd5d5b656fb92dbfa4758342ce92f9fe9ab76aa877d7d1f82934e6aa5f69		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AC2 4896 bytes
font_01_sfnt_off00008b41.bin
653ca6dc1ab56e7c6bec9eb143ac219f670a65b765d02aaab4b6a94dcc5a4ae2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B41 15080 bytes

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