Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1821ab20095cf91…

MALICIOUS

PDF

46.3 KB Created: 2020-08-24 06:49:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e98eab247bfab77b75f9979654445b8c SHA-1: 6ece518c910b2c626afa7aefe89b7bd933961f66 SHA-256: c1821ab20095cf91ae183d0af2e889d463752b6f366d89b5fdf278459ad5d34d
94 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link that is disguised as educational content. The ML classifier strongly flagged this PDF as malicious, and the embedded URL points to known malicious infrastructure. The document body, though heavily obfuscated, contains the target URL, suggesting a social engineering lure to trick users into clicking the link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 3

  • 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.
  • 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=character+education+worksheets+for+highschool+students
    • http://napaluje.sieglindemcgee.com/uploads/1/3/1/4/131407836/teteworazebinu.pdf
    • https://cdn.shopify.com/s/files/1/0436/4202/8182/files/99308085697.pdf
    • https://cdn.shopify.com/s/files/1/0435/4441/2309/files/bubble_struggle_mod_apk.pdf
    • https://cdn.shopify.com/s/files/1/0439/3720/2344/files/boundaries_circle_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0434/1799/3366/files/40451565961.pdf
    • https://cdn.shopify.com/s/files/1/0437/6159/8616/files/financial_spread_betting_for_dummies.pdf
    • https://cdn.shopify.com/s/files/1/0433/4875/4581/files/xaxitabanixo.pdf
    • https://cdn.shopify.com/s/files/1/0435/7213/4049/files/rugip.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000068bd.bin
7a698ece6a4c6431a4a5a53856188dd8a0dd534646abf6bab19b5cfaedad57c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68BD 5344 bytes
font_01_sfnt_off00007af5.bin
355e4eac040ef0ea3c14070ac4f1ae9eed545b4822e939ca0cc055819f3417ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AF5 10360 bytes
font_02_sfnt_off00009e5e.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E5E 4324 bytes

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