Malicious PDF — malware analysis report

Static analysis result for SHA-256 e208bcd9f2b6636b…

MALICIOUS

PDF

27.6 KB Created: 2018-06-11 08:18:32 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7) First seen: 2020-09-04
MD5: cd424e5a5a888bad29327b4664c668b3 SHA-1: d738cbeadfba1c39ce636cc884c703dd4ab45d1b SHA-256: e208bcd9f2b6636b696c642c047583d468d88287ca3fdac512751b1a1a0f7f95
130 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The ML classifier strongly flagged this PDF as malicious. The presence of a visual download button and an external URI pointing to a PDF file suggests a social engineering lure. The document body contains multiple URLs, with the primary suspicious URL being http://uncpbisdegree.com/download3.php?q=witches-and-jesuits-shakespeare-apos-s-macbeth.pdf, which likely hosts a malicious payload. No scripts were extracted, limiting the analysis of the execution chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9664

Heuristics 4

  • Fake 'free download' SEO-poisoning PDF critical PDF_SEO_FAKE_DOWNLOAD
    The ML classifier flagged this PDF AND it carries a visual download/call-to-action lure AND an off-domain server-side download-gateway link whose query string names a document payload. This three-signal conjunction is the fake-document / 'free PDF download' SEO-poisoning delivery pattern: the page is padded with benign decoy links to dilute classifier scores while funnelling the victim through the gateway to malware/scareware. Acting only on the conjunction keeps benign download-bearing PDFs from being misflagged.
  • PDF carries a PHP-gateway SEO-spam PDF link farm medium PDF_SEO_PHP_GATEWAY_LINK_FARM
    PDF contains four or more clickable links whose target is a `.php` gateway with a multi-word search-PHRASE document slug embedded after it (e.g. 'index.php?.../binary+options+trading+nz.pdf' or 'pdf.php/cialis-dosage-side-effects.pdf'). Legitimate PHP-served documents use a filename or numeric id, not a search-query phrase, so this is the generated SEO link-farm shape — pharma / binary-options / 'free download' spam that ranks for queries and routes users into payload/redirect chains. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://uncpbisdegree.com/download3.php?q=witches-and-jesuits-shakespeare-apos-s-macbeth.pdf In PDF document text
    • http://uncpbisdegree.com/download4.php?q=witches-and-jesuits-shakespeare-apos-s-macbeth.pdfIn PDF document text
    • http://riverside-resort.net/1/volvo-s40-trunk-key-diagram.pdfIn PDF document text
    • http://riverside-resort.net/1/well-labelled-computer-system-diagram.pdfIn PDF document text
    • http://uncpbisdegree.com/1/the-candida-free-cookbook-125-recipes-to-beat-candida-and-live-yeast-free.pdfIn PDF document text
    • http://uncpbisdegree.com/1/the-blue-fairy-book-andrew-lang.pdfIn PDF document text
    • http://riverside-resort.net/1/what-causes-hardening-of-the-lungs.pdfIn PDF document text
    • http://uncpbisdegree.com/1/the-dream-fields-of-florida-mexican-farmworkers-and-the-myth-of-belonging.pdfIn PDF document text
    • http://riverside-resort.net/1/venus-magnetic-field.pdfIn PDF document text
    • http://uncpbisdegree.com/1/solutions-manual-numerical-linear-algebra-trefethen.pdfIn PDF document text
    • http://uncpbisdegree.com/1/the-cigar-companion-a-connoisseurs-guide-companion.pdfIn PDF document text
    • http://uncpbisdegree.com/1/strongly-coupled-plasma-physics.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://go.microsoft.com/fwlink/?LinkId=521839&CLCID=0409In PDF document text
    • http://go.microsoft.com/fwlink/?LinkID=246338&CLCID=0409In PDF document text
    • https://go.microsoft.com/fwlink/?linkid=868922In PDF document text
    • http://go.microsoft.com/fwlink/?LinkID=286759&CLCID=409In PDF document text
    • http://go.microsoft.com/fwlink/?LinkID=617297In PDF document text
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3234 10132 bytes
SHA-256: 3bfe6353a8d68a9d475a03b6de02350893b13fb8c581b42a43860f340130b596
font_01_sfnt_off0000526c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x526C 7256 bytes
SHA-256: a257f2f8deb058ec5d3ccf2c39b074d4338f4ff5d5bfe77b94392e3e64eaebc4

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