Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfdd1e7709374ca7…

MALICIOUS

PDF

34.3 KB Created: 2018-06-11 10:00:16 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 4add849e9c9629ac0723ae2abbf86d5e SHA-1: 3c8f2ef75126a298d796b54e1be6ade04ba2e9b5 SHA-256: bfdd1e7709374ca77c766c05c863fa387f198bdc32e74a966af0902ba182e7c3
130 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9454

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=stories-and-poems-classic-retelling-edgar-allan-poe.pdf In PDF document text
    • http://uncpbisdegree.com/download4.php?q=stories-and-poems-classic-retelling-edgar-allan-poe.pdfIn PDF document text
    • http://classicalpoets.org/10-greatest-poems-ever-written/In PDF document text
    • http://classicalpoets.org/category/poetry/In PDF document text
    • http://classicalpoets.org/category/poetry/beauty/In PDF document text
    • http://www.123helpme.com/search.asp?text=dramatic+ironyIn PDF document text
    • http://shareranks.com/533,Greatest-American-WritersIn PDF document text
    • http://www.johnabbott.qc.ca/academics/course-calendar-2/english/In PDF document text
    • http://watersidearts.org/whats-on/In PDF document text
    • http://www.123helpme.com/search.asp?text=favorite+characterIn PDF document text
    • http://www.oldchildrensbooks.com/catalogues-lists/catalogue-20In PDF document text
    • http://www.shadow-writer.co.uk/news.htmlIn PDF document text
    • http://catalogue.tracpac.ab.ca/polaris/Search/newreleases.aspx?ListingTypeID=26&ctx=1.1033.0.0.3In PDF document text
    • http://www.scriptcircle.co.uk/catalogue.htmlIn PDF document text
    • http://www.antarctic-circle.org/book.htmIn PDF document text
    • http://www.thelastexit.net/cinema/other.htmlIn PDF document text
    • http://www.berro.com/common_text/text_5.htmIn PDF document text
    • http://riverside-resort.net/1/the-bourne-ultimatum-the-bourne-saga-book-three-jason-bourne-3.pdfIn PDF document text
    • http://riverside-resort.net/1/stunde-der-drachen-1-zwischen-den-welten-fantasy-liebesroman-german-edition.pdfIn PDF document text
    • http://riverside-resort.net/1/t10-mobile-user-guide-file.pdfIn PDF document text
    • http://riverside-resort.net/1/solution-manual-balanis-edition-2-electromagnetics.pdfIn PDF document text
    • http://riverside-resort.net/1/staff-manual-sign-off-form.pdfIn PDF document text
    • http://riverside-resort.net/1/theory-of-production.pdfIn PDF document text
    • http://riverside-resort.net/1/ubc-eosc-112-past-exams-and-answers.pdfIn PDF document text
    • http://riverside-resort.net/1/the-soundtrack-of-my-life.pdfIn PDF document text
    • http://riverside-resort.net/1/spectralink-tga116-routers-owners-manual.pdfIn PDF document text
    • http://riverside-resort.net/1/solution-manual-for-modern-database-management-hoffer.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://www.gradesaver.com/poes-poetry/study-guide/summary-tamerlaneIn PDF document text
    • http://etc.usf.edu/lit2go/books/In PDF document text
    • https://en.wikipedia.org/wiki/One_Thousand_and_One_NightsIn PDF document text
    • https://en.wikipedia.org/wiki/LolitaIn PDF document text
    • http://www.gutenberg.org/browse/titles/wIn PDF document text
    • https://archive.nytimes.com/www.nytimes.com/books/00/04/16/reviews/000416.16rawsont.htmlIn PDF document text
    • http://mentalfloss.com/article/514198/10-dramatic-facts-about-king-learIn PDF document text
    • https://www.telegraph.co.uk/culture/In PDF document text
    • https://www.hollywoodreporter.com/In PDF document text
    • http://www.loot.co.za/index/html/index689.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_off00004adb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4ADB 10404 bytes
SHA-256: 0ded5d1338e48941633205070e77b44237f147f910c117a20c62535d02dc9187
font_01_sfnt_off00006bec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BEC 6912 bytes
SHA-256: 537190dd30f4789851cfc639c1b4ccbc125f43c00bab5dea43c46fcdbe9db82d