Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a4c3081970ac414…

MALICIOUS

PDF

30.6 KB Created: 2018-06-11 08:23:51 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7)
MD5: 34f48ab0b7e2622be160a006592cbd2e SHA-1: 16a2f1fa988046220c51b47f63c2315bfbad1489 SHA-256: 5a4c3081970ac414d4a271ded2cd687e7d5d849ce1143dbabff8fac859fcba14
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document employs SEO poisoning by mimicking a book download, directing users to a malicious URL. The heuristic 'PDF_SEO_FAKE_DOWNLOAD' and the presence of suspicious URLs strongly indicate a phishing or malware distribution attempt. No scripts were extracted, but the document's structure and embedded links are designed to trick the user into downloading a potentially harmful file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9593

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=the-cambridge-companion-to-twentieth-century-opera.pdf
    • http://uncpbisdegree.com/download4.php?q=the-cambridge-companion-to-twentieth-century-opera.pdf
    • http://www.foodtimeline.org/foodcakes.html
    • http://www.cameratamusica.org.uk/future-concerts/
    • http://www.foodtimeline.org/foodpies.html
    • http://www.howarddavidjohnson.com/nordicmyths.htm
    • http://www.historicalnovels.info/Nineteenth-Century-Europe.html
    • http://www.historicalnovels.info/Seventeenth-Century.html
    • http://riverside-resort.net/1/toyota-hilux-1982.pdf
    • http://riverside-resort.net/1/the-foucault-reader-michel.pdf
    • http://riverside-resort.net/1/the-united-states-and-mexico.pdf
    • http://riverside-resort.net/1/statistics-for-dummies.pdf
    • http://riverside-resort.net/1/speed-science.pdf
    • http://riverside-resort.net/1/the-dyscalculia-solution-teaching-number-sense.pdf
    • http://riverside-resort.net/1/teaching-problem-and-solution-3rd-grade.pdf
    • http://riverside-resort.net/1/the-magicians-workbook-practicing-the-rituals-of-the-western-tradition.pdf
    • http://riverside-resort.net/1/toro-lawn-mowers-manual.pdf
    • http://riverside-resort.net/1/smurfs-village-questions-and-answers.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://www.cambridge.org/core/redirect-support
    • https://en.wikipedia.org/wiki/Britten
    • https://en.wikipedia.org/wiki/Opera
    • https://www.poetryfoundation.org/poets/ezra-pound
    • http://www.iep.utm.edu/scotus/
    • 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_off00003c3d.bin
1c2cf4361f2f0014245f29b6573fb303f2978cc3ffbae691232a84d9c13d0cee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3C3D 10496 bytes
font_01_sfnt_off00005d7e.bin
0e4ab48c70f5a0ee882c73a715911f2425a61354cdbec9e33ea462cefe6a34e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D7E 7184 bytes

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