Malicious PDF — malware analysis report

Static analysis result for SHA-256 704112447f2bd1c3…

MALICIOUS

PDF

37.6 KB Created: 2020-08-31 07:25:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ba5102f31deae30156af60378b8b4f3b SHA-1: 7c251f8ba495702a5395a7867b55bfb2f1ace0f9 SHA-256: 704112447f2bd1c3b57615657e661629095f9cfc51a5457f5246ca830fe08c06
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains an embedded link that redirects to a known malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same malicious URL, suggesting a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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/wix?keyword=fundamentals+of+financial+accounting+libby+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/a64c8c_ca6e04cef79a4ddaba0e510c21c5ad21.pdf
    • https://static.usrfiles.com/ugd/5b9a87_2e55ae6575ed44c080b48f2990c30aac.pdf
    • https://static.usrfiles.com/ugd/1b8612_c7fcd0351a6d42778fd6f5b50c5ec006.pdf
    • https://cdn.shopify.com/s/files/1/0428/4334/0956/files/71565464573.pdf
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/47650623758.pdf
    • https://cdn.shopify.com/s/files/1/0431/7331/4715/files/nugapexobizo.pdf
    • https://cdn.shopify.com/s/files/1/0435/7141/3155/files/39570544498.pdf
    • https://cdn.shopify.com/s/files/1/0434/0065/9100/files/dungeons_and_dragons_character_sheet_editable_5e.pdf
    • https://cdn.shopify.com/s/files/1/0434/5180/9959/files/equipment_commissioning_report_template.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_off0000550c.bin
d16d521664383e01b0189fa3f6fbbf24368ea039fea4c9bdaf4af782cdd34787		 pdf-font-stream PDF embedded font (sfnt) at offset 0x550C 5576 bytes
font_01_sfnt_off000067fa.bin
72576f6e42eb2650c3ea46ae72e576d71af0fec11324dbe795de7c5044755e70		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67FA 9860 bytes

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