Malicious PDF — malware analysis report

Static analysis result for SHA-256 6140971078d76d54…

MALICIOUS

PDF

36.5 KB Created: 2018-06-11 09:59:09 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7)
MD5: 3faee78aa4e71e5911c89d67f28f8be4 SHA-1: 4924c292f835419408416930c57629b87ab5315f SHA-256: 6140971078d76d542b3dd4c2a21961c5840e8c7511c1a50ced0cd3c833b40caf
102 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and a critical heuristic for SEO poisoning, indicating it's designed to trick users into downloading malicious files. The embedded URLs, specifically http://uncpbisdegree.com/download3.php?q=student-depression-a-silent-crisis-in-our-schools-and-communities.pdf, are the primary mechanism for delivering the payload. The document body, though partially garbled, contains references to these URLs and suggests a deceptive lure.

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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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=student-depression-a-silent-crisis-in-our-schools-and-communities.pdf
    • http://uncpbisdegree.com/download4.php?q=student-depression-a-silent-crisis-in-our-schools-and-communities.pdf
    • http://www.nmhu.edu/student-handbook/
    • https://essayscam.org/forum/fe/homeschooling-argument-defense-public-schools-5539/
    • http://www.polkcountytoday.com/letterstotheeditor.html
    • http://www.thegovernmentrag.com/
    • http://narrative.ly/why-ive-always-been-silent-about-israel-and-palestine-and-why-im-speaking-out-now/
    • https://thebestschools.org/features/smartest-people-faith/
    • https://ama.com.au/position-statement/obesity-2016
    • http://www.volokh.com/archives/archive_2009_05_17-2009_05_23.shtml
    • http://www.stopthecrime.net/break.html
    • http://uncpbisdegree.com/1/the-dragon-of-trelian-1-michelle-knudsen.pdf
    • http://riverside-resort.net/1/without-warning-angels-of-vengeance-the-disappearance-series-book-3.pdf
    • http://uncpbisdegree.com/1/subaru-outback-door-diagram.pdf
    • http://uncpbisdegree.com/1/shanti-saves-her-money-cloverleaf-books-money-basics.pdf
    • http://uncpbisdegree.com/1/suzuki-canada-2018-motorcycles.pdf
    • http://uncpbisdegree.com/1/swift-as-desire-laura-esquivel.pdf
    • http://uncpbisdegree.com/1/texas-staar-coach-answer-key.pdf
    • http://riverside-resort.net/1/valentine-card-design-pinterest.pdf
    • http://uncpbisdegree.com/1/stihl-ms-660-owners-manual.pdf
    • http://uncpbisdegree.com/1/suzuki-gs-650-service-manual.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nationalpost.com/silent-no-more
    • https://abcnews.go.com/health
    • https://www.nytimes.com/2017/10/11/magazine/why-are-more-american-teenagers-than-ever-suffering-from-severe-anxiety.html
    • http://www.nami.org/
    • https://www.deseretnews.com/indepth
    • https://en.wikipedia.org/wiki/Transphobia
    • https://mail.google.com/mail/u/0/
    • https://www.washingtontimes.com/communities/
    • http://gatesofvienna.blogspot.com/
    • http://www.philly.com/philly/archives/
    • https://www.mentalhelp.net/articles/major-depression-and-other-unipolar-depressions/
    • https://www.mentalhelp.net/articles/
    • https://www.jstor.org/subject/sociology
    • http://www.breitbart.com/video/
    • https://abcnews.go.com/US/
    • https://www.mind.org.uk/information-support/your-stories/
    • https://www.newscientist.com/lastword/
    • http://www.pbs.org/program/retired-site/
    • https://www.usatoday.com/topic/D2591A44-DFD9-4D0D-AF7A-CC0B3B92CBB0/health-wellness/
    • https://en.wikipedia.org/wiki/Martin_Luther_King,_Jr
    • http://www.trust.org/humanitarian/
    • http://go.microsoft.com/fwlink/?LinkId=521839&CLCID=0409
    • http://go.microsoft.com/fwlink/?LinkID=246338&CLCID=0409
    • https://go.microsoft.com/fwlink/?linkid=868922
    • http://go.microsoft.com/fwlink/?LinkID=286759&CLCID=409
    • http://go.microsoft.com/fwlink/?LinkID=617297
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000051eb.bin
803fc9367c8d424535bc89dc20e8f0e3690ab97f5cf6d13860e88c752771b3cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x51EB 10764 bytes
font_01_sfnt_off00007402.bin
4b8981fcac2ea2efb84a3592d7039b4c063ea9720aa66465c85c5e5ff681ae86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7402 6768 bytes

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