Malicious PDF — malware analysis report

Static analysis result for SHA-256 24c2b1b63ab4a5c6…

MALICIOUS

PDF

31.4 KB Created: 2018-06-11 08:43:47 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7) First seen: 2020-09-04
MD5: 15586180054d3ab60bb3edb9d3c53173 SHA-1: c54a678bbdde380f80dbc292634f4ea0b894a9bf SHA-256: 24c2b1b63ab4a5c6551e4629036b8b2f308dc2f9a63ffeb1cba8dd3e3e8bc68d
130 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file contains embedded URLs that point to a suspicious domain, likely intended to trick the user into downloading a malicious payload. The ML classifier also flagged this PDF as malicious. The presence of these URLs suggests a social engineering attack aimed at content-based lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9545

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=topsy-washington-monologues-for-women.pdf In PDF document text
    • http://uncpbisdegree.com/download4.php?q=topsy-washington-monologues-for-women.pdfIn PDF document text
    • http://www.pageinsider.com/In PDF document text
    • http://freemasoninformation.com/masonic-education/freemasonry-in-cinema/In PDF document text
    • http://www.bsnpubs.com/decca/coral/coral.htmlIn PDF document text
    • https://www.asymptotejournal.com/about/In PDF document text
    • https://1mbed.com/In PDF document text
    • http://riverside-resort.net/1/what-is-knowledge-suny-series-in-latin-american-and-iberian-thought-and-culture.pdfIn PDF document text
    • http://uncpbisdegree.com/1/telstra-7100a-user-guide.pdfIn PDF document text
    • http://uncpbisdegree.com/1/the-forensic-casebook-science-of-crime-scene-investigation-ngaire-e-genge.pdfIn PDF document text
    • http://uncpbisdegree.com/1/the-appalachian-indian-frontier-edmond-atkin-report-and-plan-of-1755.pdfIn PDF document text
    • http://riverside-resort.net/1/world-trade-center-time.pdfIn PDF document text
    • http://riverside-resort.net/1/unizulu-2018-second-semester-timetable.pdfIn PDF document text
    • http://uncpbisdegree.com/1/the-complete-poems.pdfIn PDF document text
    • http://riverside-resort.net/1/workshop-manual-for-alfa-romeo-156.pdfIn PDF document text
    • http://uncpbisdegree.com/1/service-b-mercedes-c230.pdfIn PDF document text
    • http://uncpbisdegree.com/1/the-great-gatsby-chapter-4-questions.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.filmsite.org/comedyfilms7.htmlIn PDF document text
    • http://www.filmsite.org/aa04.htmlIn PDF document text
    • http://www.seattle.gov/arts/cityartist-projects-grantIn PDF document text
    • https://www.barnesandnoble.com/w/the-flamethrowers-rachel-kushner/1112033302In PDF document text
    • http://tvline.com/2014/03/27/scandal-recap-fitz-kids-learn-mellie-affair-with-andrew/#In PDF document text
    • https://www.onelook.com/pm/In PDF document text
    • http://www.dictionary.com/e/s/word-of-the-year-list/In PDF document text
    • http://www.microsofttranslator.com/bv.aspx?ref=SERP&br=ro&mkt=en-US&dl=en&lp=FR_EN&a=https%3a%2f%2f1mbed.com%2fIn 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_off00003df5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3DF5 10892 bytes
SHA-256: ad4626ad2824dcf675aae2c4bd346b6b896e970b09c1708302c8e6eca521077b
font_01_sfnt_off00006067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6067 7240 bytes
SHA-256: 1536a29de480539155c25955ff5aa615620ba901380c66bfff8b48388420d08e

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