Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec639dfd1812b5c0…

MALICIOUS

PDF

36.1 KB Created: 2018-06-11 08:15:07 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7) First seen: 2020-08-25
MD5: afba3538fc61fbdedd0131f563f48754 SHA-1: 32e292d323babf69f0b091e8faaaf429e65a64bb SHA-256: ec639dfd1812b5c08c7aba6fcd321e1750b89d906e39fcc2954357cf4c6bc2fa
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains embedded URLs and a document body that mimics search results or article links, specifically mentioning 'undeniable the oregon trail series'. The presence of a suspicious external URI and a high-confidence ML classifier firing strongly suggests malicious intent. The document body's structure and the embedded URLs point towards a social engineering lure to trick the user into downloading a file, likely malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9136

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=undeniable-the-oregon-trail-series.pdf In PDF document text
    • http://uncpbisdegree.com/download4.php?q=undeniable-the-oregon-trail-series.pdfIn PDF document text
    • https://lauralstapleton.com/the-oregon-trail-short-stories/In PDF document text
    • http://www.geoengineeringwatch.org/undeniable-video-footage-of-wing-tip-aerosol-spraying/In PDF document text
    • https://lauralstapleton.com/In PDF document text
    • https://oregonencyclopedia.org/articles/columbia_river/In PDF document text
    • http://chemeketans.org/activity_calendar.aspIn PDF document text
    • http://www.voicenews.com/sports/In PDF document text
    • http://www.c3events.com/upcoming-events/bank_of_the_cascades_bend_summer_festivalIn PDF document text
    • https://www.canoekayak.com/start-paddling/basics-of-buying-a-canoe/In PDF document text
    • http://www.doityourselfrv.com/pacific-coast-highway/In PDF document text
    • http://www.sbkcorse.com/In PDF document text
    • http://wingsovermyrtlebeach.com/performers/In PDF document text
    • http://www.mrcstudios.com/press/indexIn PDF document text
    • http://diygardenshedplansez.com/ashes.comic.series.comic/first-step-to-building-a-home=cb2070/In PDF document text
    • https://www.spin-off.fr/calendrier_des_series.htmlIn PDF document text
    • http://www.boatsandcycles.com/atvs/for-sale/In PDF document text
    • http://laszlo-zsolnai.net/content/intellectual-self-portraitIn PDF document text
    • http://www.geoengineeringwatch.org/geoengineering-watch-global-alert-news-february-17-2018-132/In PDF document text
    • http://riverside-resort.net/1/the-goon-volume-1-nothin-but-misery-eric-powell.pdfIn PDF document text
    • http://riverside-resort.net/1/ssc-exm-calender-2018-2018.pdfIn PDF document text
    • http://riverside-resort.net/1/semiotics-an-introductory-anthology.pdfIn PDF document text
    • http://riverside-resort.net/1/sharp-fx-cell-phone-manual.pdfIn PDF document text
    • http://riverside-resort.net/1/the-littlest-levine.pdfIn PDF document text
    • http://riverside-resort.net/1/solution-manual-for-operations-research-an-introduction-8th-edition.pdfIn PDF document text
    • http://riverside-resort.net/1/the-crucible-act-1-quiz-answers.pdfIn PDF document text
    • http://riverside-resort.net/1/test-paper-for-class-10-cbse.pdfIn PDF document text
    • http://riverside-resort.net/1/service-manual-whirlpool-dryer.pdfIn PDF document text
    • http://riverside-resort.net/1/study-guide-for-the-constitution.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.oregonlive.com/sports/oregonian/john_canzano/index.ssf/2018/04/canzano_trail_blazers_facing_i.htmlIn PDF document text
    • http://www.footballfanatics.com/In PDF document text
    • http://www.oregonlive.com/blazers/index.ssf/2015/04/trail_blazers_list_of_concerns_after_game_1_should.htmlIn PDF document text
    • http://time.com/4458554/best-video-games-all-time/In PDF document text
    • https://www.nationalparks.org/connect/blogIn 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%2fwww.spin-off.fr%2fcalendrier_des_series.htmlIn PDF document text
    • https://www.nationalgeographic.com/travel/In PDF document text
    • http://mentalfloss.com/article/59197/15-things-you-might-not-know-about-wyomingIn PDF document text
    • http://www.ign.com/lists/top-100-games/In PDF document text
    • http://www.indiewire.com/2015/12/best-of-2015-the-15-best-trailers-of-the-year-101724/#In PDF document text
    • https://es.wikipedia.org/wiki/LibroIn PDF document text
    • https://bleacherreport.com/articles/1145336-the-200-most-important-events-in-sportsIn PDF document text
    • http://go.microsoft.com/fwlink/?LinkID=617350In 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_off000050f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x50F8 9992 bytes
SHA-256: 5e31549f935946b07667654d748f1f1b6199690d13c26cf32ed35c932f673664
font_01_sfnt_off000070da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70DA 7320 bytes
SHA-256: 01ab99e9eddd64cef7f9d3beb8e8fc769cb68a55bf23fccc2096319249f591cc