Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b6505c766ad9631…

MALICIOUS

PDF

30.0 KB Created: 2018-06-11 09:25:12 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7) First seen: 2020-08-25
MD5: cef668eeb4d8d786234d9c3c0acfc042 SHA-1: daae2032a6fbc667d01c96c63be565996b802a7a SHA-256: 2b6505c766ad963120a7f329537c6d913efc004dbfdbad34827de9cb06e9f22f
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains embedded URLs and is flagged by heuristics for SEO poisoning and fake download lures. Specifically, it uses a PHP gateway to redirect users to a fake download page, likely to distribute malware. The document body contains numerous links, including the primary malicious URL, reinforcing the download lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9648

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=shadowfell-1-juliet-marillier.pdf In PDF document text
    • http://uncpbisdegree.com/download4.php?q=shadowfell-1-juliet-marillier.pdfIn PDF document text
    • http://www.julietmarillier.com/blog/In PDF document text
    • https://www.boekbeschrijvingen.nl/marillier-juliet/marillier.htmlIn PDF document text
    • http://www.historicalnovels.info/Medieval-YA.htmlIn PDF document text
    • http://www.fantasybookreview.co.uk/Brent-Weeks/The-Black-Prism.htmlIn PDF document text
    • http://www.fantasybookreview.co.uk/fantasy-sub-genres/wizards-magicians.phpIn PDF document text
    • http://uncpbisdegree.com/1/the-classic-outboard-motor-handbook-book.pdfIn PDF document text
    • http://uncpbisdegree.com/1/sony-vgn-sr130e-laptops-owners-manual.pdfIn PDF document text
    • http://riverside-resort.net/1/used-flat-track-motorcycles.pdfIn PDF document text
    • http://riverside-resort.net/1/yamaha-v50-service-manual.pdfIn PDF document text
    • http://uncpbisdegree.com/1/solution-manual-computer-networks-peterson-4th-edition.pdfIn PDF document text
    • http://uncpbisdegree.com/1/sharp-cash-register-xea203-manual.pdfIn PDF document text
    • http://riverside-resort.net/1/when-was-marco-polo-born.pdfIn PDF document text
    • http://riverside-resort.net/1/what-is-the-animal-kingdom-science-of-living-things.pdfIn PDF document text
    • http://riverside-resort.net/1/volvo-d11-engine-diagram.pdfIn PDF document text
    • http://uncpbisdegree.com/1/simple-genius-sean-king-amp-michelle-maxwell-3-david-baldacci.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://nl.wikipedia.org/wiki/Juliet_MarillierIn PDF document text
    • http://www.microsofttranslator.com/bv.aspx?ref=SERP&br=ro&mkt=en-US&dl=en&lp=NL_EN&a=https%3a%2f%2fnl.wikipedia.org%2fwiki%2fJuliet_MarillierIn PDF document text
    • http://www.microsofttranslator.com/bv.aspx?ref=SERP&br=ro&mkt=en-US&dl=en&lp=NL_EN&a=https%3a%2f%2fwww.boekbeschrijvingen.nl%2fmarillier-juliet%2fmarillier.htmlIn PDF document text
    • http://archiveofourown.org/media/BooksIn 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_off00003a91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3A91 10412 bytes
SHA-256: 4b078094a7be4c884bd1cdd1a0b2cbe53f5548cc09a45a1122b3aa7718a2e2c0
font_01_sfnt_off00005bb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5BB1 7004 bytes
SHA-256: 4a7a5733cb511f454f92a7b2572f1bd120aa814485bab47b6ba6009a0e0a767d