Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb8958c92b24bd84…

MALICIOUS

PDF

39.9 KB Created: 2020-08-21 01:58:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e04142e390e1b3be35ef05a142d61097 SHA-1: 5f64e499bd5e5fee5959bbd8a28faa068ee9575c SHA-256: cb8958c92b24bd84a4384e05806257364aed35922a9ecccb0b6e7550eafd863d
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. This URL is embedded within the document body, which also contains garbled text and references to 'camscanner android', suggesting a lure. The PDF also exhibits characteristics of a link farm, with numerous external links, one of which leads to a potentially malicious PDF hosted on 'dassiedahan-author.com'. The ML classifier 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.com/pify?keyword=application+camscanner+android
    • http://files.dassiedahan-author.com/uploads/1/3/1/4/131436971/wixodasa.pdf
    • https://cdn.shopify.com/s/files/1/0434/3437/7372/files/icao_annex_5.pdf
    • https://cdn.shopify.com/s/files/1/0435/5309/5844/files/5x7_envelope_template_svg.pdf
    • https://cdn.shopify.com/s/files/1/0437/6133/6471/files/entrepreneurship_development_and_business_communication_agrimoon.pdf
    • https://cdn.shopify.com/s/files/1/0428/7404/4579/files/49437035092.pdf
    • https://cdn.shopify.com/s/files/1/0433/0392/7973/files/mexupuxe.pdf
    • https://cdn.shopify.com/s/files/1/0440/5064/5157/files/client_grievance_form.pdf
    • https://cdn.shopify.com/s/files/1/0438/6763/5867/files/tezetonipotafiwoz.pdf
    • https://cdn.shopify.com/s/files/1/0445/5186/4484/files/tesifuzilozezos.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_off00005f47.bin
97bc175fce62585a1270e25ced073c2f25e8b01c2972f73e9af97b9f79fb0a94		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F47 5208 bytes
font_01_sfnt_off000070d3.bin
6dd820fd1c23c6d5fca88d75a040897baf180451c77cddeae090e0bf7fab8d43		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70D3 10056 bytes

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