Malicious PDF — malware analysis report

Static analysis result for SHA-256 13095b031b90451f…

MALICIOUS

PDF

30.6 KB Created: 2018-06-11 09:21:34 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7)
MD5: e45a81f5a18f1d3c12daa315ebac3ead SHA-1: 81482e45c0b4474508d458a45a387cf1fc27b4be SHA-256: 13095b031b90451fc9b797f1f3c577e3a544f6233e69dae72360f8e5e65e31d6
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains heuristics indicating it is a fake 'free download' SEO-poisoning document. It embeds URLs that lead to a download page, suggesting an attempt to lure the user into downloading a second-stage payload. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9276

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-centaur-algernon-blackwood.pdf
    • http://uncpbisdegree.com/download4.php?q=the-centaur-algernon-blackwood.pdf
    • http://www.mccunecollection.org/fine_printing.html
    • http://www.gatewayalpacas.com/alpacas/alpacas-as-a-business/new-owner-checklist.htm
    • http://www.vcisinc.com/clarinetcds.htm
    • http://riverside-resort.net/1/test-bank-for-biology-campbell-9th-edition.pdf
    • http://riverside-resort.net/1/solution-manual-glencoe-geometry.pdf
    • http://riverside-resort.net/1/service-manuals-for-td8h-dresser-dozer.pdf
    • http://riverside-resort.net/1/toyota-levin-assembly-diagram.pdf
    • http://riverside-resort.net/1/treasure-hunt-for-kids-song.pdf
    • http://riverside-resort.net/1/toyota-1c-wireing-diagram.pdf
    • http://riverside-resort.net/1/the-snowstorm.pdf
    • http://riverside-resort.net/1/service-manual-isuzu-npr-transmission.pdf
    • http://riverside-resort.net/1/soufeel-coupon.pdf
    • http://riverside-resort.net/1/study-guide-for-physics-caps.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://manybooks.net/categories/OCC
    • https://en.wikipedia.org/wiki/Numinous
    • http://www.gutenberg.org/browse/authors/b
    • http://lovecraft.wikia.com/wiki/Howard_Phillips_Lovecraft
    • https://en.wikipedia.org/wiki/H_P_Lovecraft
    • https://newspaperarchive.com/london-morning-post-jul-02-1853-p-5/
    • http://tvtropes.org/pmwiki/pmwiki.php/Main/BrainBleach
    • http://www.jstor.org/subject/literature
    • http://discovery.nationalarchives.gov.uk/details/a/A13531878
    • 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_off00003de3.bin
b0f2d473ad47f61bf6d0123b13f39beceb7156631929d0225db2d8ce47707600
pdf-font-stream PDF embedded font (sfnt) at offset 0x3DE3 9944 bytes
font_01_sfnt_off00005d94.bin
5bff884ce5f4d599ef7af6d7d37bf01a0af6e317e14124781ca571e6528008b6
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D94 7116 bytes