Malicious PDF — malware analysis report

Static analysis result for SHA-256 10d7a1d06d1ec7ca…

MALICIOUS

PDF

28.2 KB Created: 2018-06-11 09:30:43 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7)
MD5: 1db0bd6c0e135a9ea9fbfb5314215616 SHA-1: 9603470f45ee0836d00826b9dfe778a94b0c3c65 SHA-256: 10d7a1d06d1ec7ca8983404863098fcf912dd21caf81457cff8850bb6667e168
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains embedded URLs and heuristics indicate it is a fake download lure, specifically designed to trick users into downloading content. The document body mimics search result snippets, further supporting the SEO poisoning and fake download pretext. The primary malicious URLs identified are http://uncpbisdegree.com/download3.php?q=volume-of-solids-tesccc-answer-key.pdf and http://uncpbisdegree.com/download4.php?q=volume-of-solids-tesccc-answer-key.pdf, which are likely gateways to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9683

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=volume-of-solids-tesccc-answer-key.pdf
    • http://uncpbisdegree.com/download4.php?q=volume-of-solids-tesccc-answer-key.pdf
    • http://burnscamp.org.uk/4/8/eastern-psychology-buddhism-hinduism-and-taoism.pdf
    • http://riverside-resort.net/1/the-abap-developers-guide-to-java.pdf
    • http://riverside-resort.net/1/sony-pcv-rx600-desktops-owners-manual.pdf
    • http://riverside-resort.net/1/sprints-purple-not-so-crazy-scientist.pdf
    • http://riverside-resort.net/1/the-fifth-ghost-story-megapack-tm-25-classic-haunts.pdf
    • http://riverside-resort.net/1/seleccion-de-cuentos.pdf
    • http://riverside-resort.net/1/twice-told-tales-nathaniel-hawthorne.pdf
    • http://riverside-resort.net/1/the-mean-girl-meltdown-a-sylvie-scruggs-story.pdf
    • http://riverside-resort.net/1/the-diamond-cutter-buddha-on-managing-your-business-and-life-michael-roach.pdf
    • http://riverside-resort.net/1/the-fighting-men-of-the-civil-war.pdf
    • http://riverside-resort.net/1/suzuki-drz-400-sm-service-manual.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off00003430.bin
85623994e7940a60beac8a7e1c1c9edbd685193799d20807e756bcd5b3211a0b
pdf-font-stream PDF embedded font (sfnt) at offset 0x3430 10460 bytes
font_01_sfnt_off00005560.bin
58e4525e054d28e0546d5768cf12c9fd0472f5798381d10165d6b79e3b205040
pdf-font-stream PDF embedded font (sfnt) at offset 0x5560 6988 bytes