Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cb4fc0eab58f141…

MALICIOUS

PDF

32.3 KB Created: 2018-06-11 09:19:57 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7)
MD5: fe59d1765bf5bae04b1d1b2af546ec82 SHA-1: ce1bf0852201f984e4ca3399d7c371444b5d2760 SHA-256: 6cb4fc0eab58f1410410f1cafa8d0b32a690aede17cc002c90adc28a7d26d904
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1204.002 Malicious Link

This PDF document was flagged by a machine learning classifier as malicious and contains heuristics indicating it is a fake download lure designed for SEO poisoning. The embedded URLs, specifically http://uncpbisdegree.com/download3.php?q=textile-worker.pdf, are presented as download links. The document body contains numerous URLs, some of which appear to be search result snippets, further supporting the lure of finding information or downloading a file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9269

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=textile-worker.pdf
    • http://uncpbisdegree.com/download4.php?q=textile-worker.pdf
    • http://www.millmuseum.org/history/
    • http://mvtm.ca/
    • http://article.sapub.org/10.5923.j.textile.20150401.01.html
    • http://www.millmuseum.org/history/din-of-machines/
    • http://tcfua.org.au/
    • https://waronwant.org/sweatshops-china
    • https://www.textiletoday.com.bd/new-minimum-wage-rmg-workers-will-math/
    • https://www.textiletoday.com.bd/category/news-analysis-textile-apparel/
    • https://www.textiletoday.com.bd/category/news-analysis-textile-apparel/industry-insight/
    • http://www.intexa.com/downloads/pcc.pdf
    • http://www.sactwu.org.za/union-history
    • https://mbro.emsicareercoach.co.uk/
    • http://urmigroup.net/
    • http://www.womeninworldhistory.com/lesson7.html
    • http://ulula.com/
    • http://tcfua.org.au/outworkers/fairwear
    • https://www.onequickquote.co.uk/
    • http://www.rsi-therapy.com/statistics.htm
    • http://uncpbisdegree.com/1/supplimentary-2018-business-studies-feb-march.pdf
    • http://riverside-resort.net/1/wear-journal.pdf
    • http://riverside-resort.net/1/visiting-card-design-for-yoga.pdf
    • http://uncpbisdegree.com/1/the-girmitiya-saga.pdf
    • http://uncpbisdegree.com/1/swt-a-developer-apos-s-notebook.pdf
    • http://uncpbisdegree.com/1/the-diary-of-a-roadside-spectator-following-team-sky-from-the-side-of-the-road.pdf
    • http://riverside-resort.net/1/user-manual-aspire-105.pdf
    • http://riverside-resort.net/1/yusuf-bin-hasan-the-sultan-who-gained-his-revenge-makers-of-african-history-s.pdf
    • http://riverside-resort.net/1/verizon-palm-treo-user-guide.pdf
    • http://uncpbisdegree.com/1/tenerife-insight-flexi-map.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.victorianweb.org/history/workers2.html
    • https://en.wikipedia.org/wiki/Bangladesh_textile_industry
    • https://en.wikipedia.org/wiki/Textile_manufacturing
    • https://www.theguardian.com/world/rana-plaza
    • http://www.victorianweb.org/history/hist8.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_off000045c0.bin
57fdf9f4ac48f836753ece96b1f9416894f58e24c23f0c212d233e0e9e8146e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x45C0 10064 bytes
font_01_sfnt_off000065df.bin
e55b353b6be7db4daefb7db7b21c620a20edca3c53edecacf103a596ff498fb9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65DF 6192 bytes

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