Malicious PDF — malware analysis report

Static analysis result for SHA-256 04ff259dd426feea…

MALICIOUS

PDF

35.2 KB Created: 2018-06-11 08:43:40 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7)
MD5: 9962a295d69c413e304db12094192af9 SHA-1: 8a949bcae1bb7a2f8de39c721b869a752521f377 SHA-256: 04ff259dd426feeacc8ac59162833e23502de11d4251c5b0cacb07cec0823cc9
102 Risk Score

Malware Insights

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

The PDF document contains heuristics indicating it is a fake download lure, specifically designed for SEO poisoning. It embeds external URIs pointing to 'uncpbisdegree.com', which likely serves as a gateway to a malicious payload. The ML classifier also flagged this PDF as malicious with high confidence.

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=small-scale-big-change.pdf
    • http://uncpbisdegree.com/download4.php?q=small-scale-big-change.pdf
    • http://toobigtoignore.net/
    • http://www.rocketfin.com/big_scale_models.cfm
    • http://articlesng.com/roles-small-scale-industry-nigerian-economy/
    • https://moneyexcel.com/12106/30-small-scale-business-ideas
    • https://moneyexcel.com/category/business-financial-planning
    • https://ammoniaindustry.com/the-capital-intensity-of-small-scale-ammonia-plants/
    • https://www.cellsalive.com/howbig.htm
    • http://www.brainreactions.net/brainstorms/2222
    • http://floridahillbilly.com/diy-small-scale-artillery-a-black-powder-cannon/
    • http://www.bigsquidrc.com/redcat-rampage-mt-15th-scale-monster-truck-review/
    • http://www.margaretwheatley.com/articles/largescalechange.html
    • http://www.sunlighthomes.com/solar/small-homes/
    • http://equalexchange.coop/about
    • http://www.valleymodeltrains.com/
    • http://dev2ops.org/
    • https://fasterscaleapp.com/
    • http://saysi.org/
    • http://www.rocketfin.com/scale-model-workbench.cfm
    • http://riverside-resort.net/1/thermochemistry-problems-worksheet-number-two-answers.pdf
    • http://riverside-resort.net/1/thermochem-exam-with-answers.pdf
    • http://riverside-resort.net/1/travel-guide-vietnam.pdf
    • http://riverside-resort.net/1/toyota-service-bulletin-0200-10.pdf
    • http://riverside-resort.net/1/the-rspec-book-david-chelimsky.pdf
    • http://riverside-resort.net/1/the-real-act-cd-3rd-edition-real-act-prep-guide.pdf
    • http://riverside-resort.net/1/tut-general-information-for-2018-undergraduate.pdf
    • http://riverside-resort.net/1/sense-and-sensibility-norton-critical-editions.pdf
    • http://riverside-resort.net/1/talen-gene-editing.pdf
    • http://riverside-resort.net/1/substation-automation-handbook-book.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://smallscaleworld.blogspot.com/
    • http://www.mdpi.com/2073-4395/7/4/63
    • http://www.wordreference.com/es/translation.asp?tranword=small
    • http://www.wordreference.com/enit/scale
    • http://paulgraham.com/ds.html
    • http://www.talkorigins.org/faqs/astronomy/bigbang.html
    • http://www.fao.org/docrep/003/t0561e/T0561E03.htm
    • https://en.wikipedia.org/wiki/Geologic_time_scale
    • https://climate.nasa.gov/effects/
    • https://en.wikipedia.org/wiki/Diseconomies_of_scale
    • http://www.pbs.org/wgbh/evolution/library/glossary/glossary.html
    • http://www.lowtechmagazine.com/2009/04/small-windmills-test-results.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_off00004e2b.bin
28fc147c9a5ac1b14bd96f5cb7bc1c7ccaac609bc9be42635c031552e6543811		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E2B 9964 bytes
font_01_sfnt_off00006df4.bin
2f0d928cc405cbba07223a1031be3821740d79d2f51f233a939648b020d07719		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DF4 7148 bytes

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