Malicious PDF — malware analysis report

Static analysis result for SHA-256 94d351e675bc880a…

MALICIOUS

PDF

38.2 KB Created: 2020-08-21 02:50:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e4366224e8c8763e4b0dd3a285394783 SHA-1: 566e15db882b23bfe0bbd0c4ac2c54306da8207d SHA-256: 94d351e675bc880a2c376d3d8ad028efbd84ef93057ee603f4540a269315739c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the critical heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The primary malicious URL is https://ttraff.com/pify?keyword=conclusion+of+industrial+training+report. The document body, though heavily obfuscated, appears to contain references to training reports, likely as a lure. The ML classifier strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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/pify?keyword=conclusion+of+industrial+training+report
    • http://files.qualityintl.net/uploads/1/3/1/3/131398188/gadubavovum_totupebiwi_dudig_vebipuwogaxu.pdf
    • https://cdn.shopify.com/s/files/1/0431/9641/6160/files/73605702066.pdf
    • https://cdn.shopify.com/s/files/1/0429/7257/7946/files/49511565375.pdf
    • https://cdn.shopify.com/s/files/1/0431/2802/9345/files/geometrical_tolerances_definition.pdf
    • https://cdn.shopify.com/s/files/1/0437/7539/3944/files/dupenaxodotawuronukov.pdf
    • https://cdn.shopify.com/s/files/1/0429/5812/7270/files/97726489357.pdf
    • https://cdn.shopify.com/s/files/1/0434/2310/5189/files/43812640364.pdf
    • https://cdn.shopify.com/s/files/1/0434/4391/2856/files/53835506579.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000596a.bin
6a2a90ce03ba16230351e4ad467600befbae123e3bc77e043d757777201f8a13		 pdf-font-stream PDF embedded font (sfnt) at offset 0x596A 5228 bytes
font_01_sfnt_off00006b38.bin
060fb168d08644b05c9edfee384dad580bb2ce8e1155fe7ed21512f623b4e8a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B38 9772 bytes

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