Malicious PDF — malware analysis report

Static analysis result for SHA-256 4987c00045cdb359…

MALICIOUS

PDF

44.6 KB Created: 2020-08-06 11:10:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9c57fc91642979b6c26fe655683a4ae0 SHA-1: 21568c0421b401e3e6de2d49cb585fe2d9942428 SHA-256: 4987c00045cdb359736b320adfb740e57c4d316cfd99cea500aa010bfe0c9344
150 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 PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The embedded URL 'https://ttraff.ru/pify?keyword=arrondir+un+nombre+d%25C3%25A9cimal+exercices+cm2+pdf' is a key indicator of this redirection. The document body, though heavily obfuscated, contains this URL and other links, suggesting a lure to a malicious site. The ML_NYX_PDF_MALICIOUS heuristic further supports the malicious classification.

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.
  • 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.
  • 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=arrondir+un+nombre+d%25C3%25A9cimal+exercices+cm2+pdf
    • http://files.realtalkusvi.com/uploads/1/3/1/3/131381021/7773983.pdf
    • http://tufimetel.bluegroovestudios.com/uploads/1/3/0/8/130814297/sitipitopedori.pdf
    • http://bapej.rudygdesign.com/uploads/1/3/2/6/132681670/1586011.pdf
    • http://files.structuralbodyworkhawaii.com/uploads/1/3/0/8/130814676/7533921.pdf
    • https://cdn.shopify.com/s/files/1/0432/7319/1580/files/93539330645.pdf
    • https://cdn.shopify.com/s/files/1/0433/9849/6412/files/11324126000.pdf
    • https://cdn.shopify.com/s/files/1/0434/1959/9004/files/99060978947.pdf
    • https://cdn.shopify.com/s/files/1/0433/5989/5717/files/formulas_functions_in_microsoft_excel.pdf
    • https://cdn.shopify.com/s/files/1/0432/9717/7768/files/tapabugogobu.pdf
    • https://cdn.shopify.com/s/files/1/0439/3605/5454/files/mapa_acupuntura_auricular.pdf
    • https://cdn.shopify.com/s/files/1/0431/5004/9446/files/71516416087.pdf
    • https://cdn.shopify.com/s/files/1/0437/5746/9845/files/medobupabezuliduzo.pdf
    • https://cdn.shopify.com/s/files/1/0436/2931/4206/files/rabeguzobegokexotesexo.pdf
    • https://cdn.shopify.com/s/files/1/0429/8801/1673/files/business_meeting_agenda_sample.pdf
    • https://cdn.shopify.com/s/files/1/0430/8713/4882/files/jiwesobuderupigelev.pdf
    • https://cdn.shopify.com/s/files/1/0430/4555/2277/files/mijoxiwatasuvabi.pdf
    • https://cdn.shopify.com/s/files/1/0437/0612/2393/files/gofojibomifapesovo.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_off000069c9.bin
577c437969f57355168e2c3e73e91606493cb982f6d891fad8bf4919b4095432
pdf-font-stream PDF embedded font (sfnt) at offset 0x69C9 5772 bytes
font_01_sfnt_off00007d18.bin
a0e2106f4fb0060c6180e11dfbf2ebdb9c99f035f8987870bbec6c8d4433ca15
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D18 11912 bytes