Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fae588f9f46346a…

MALICIOUS

PDF

31.6 KB Created: 2018-06-11 08:56:36 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7)
MD5: 443e9346b0dd3850a604619da51ed7c1 SHA-1: 7b34bec6f9b6d55855381d59b3b1b935415861ef SHA-256: 5fae588f9f46346a80c621848cce609eab7a5920d19ffe275ce5c442565b5eb6
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF document was flagged by a machine learning classifier and contains heuristics indicating it is a fake download lure. The document body and extracted URLs point to a gateway URL designed to trick users into downloading a file. The primary malicious URLs are http://uncpbisdegree.com/download3.php?q=solutions-for-the-in-earl-gose.pdf and http://uncpbisdegree.com/download4.php?q=solutions-for-the-in-earl-gose.pdf, which are likely used to serve a secondary payload.

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=solutions-for-the-in-earl-gose.pdf
    • http://uncpbisdegree.com/download4.php?q=solutions-for-the-in-earl-gose.pdf
    • http://www.nmsoh.org/scripts/memorial_display.asp
    • http://www.bodymindspiritdirectory.org/TN.html
    • http://www.njoemscert.com/coursecatalog/index.cfm?fuseaction=advancedsearch
    • http://www.craftbeerradio.com/CraftBeerRadio.xml
    • https://chriskresser.com/how-your-antacid-drug-is-making-you-sick-part-a/
    • http://www.ussinchon.com/members.php?search=last
    • http://www.savingtoinvest.com/extra-250-for-social-security/
    • http://www.kahoufudousan.com/ads/album/album.cgi?mode=detail&id=133
    • http://uncpbisdegree.com/1/shift-how-top-real-estate-agents-tackle-tough-times.pdf
    • http://uncpbisdegree.com/1/the-green-man.pdf
    • http://uncpbisdegree.com/1/the-healing-arts-an-oxford-illustrated-anthology.pdf
    • http://uncpbisdegree.com/1/tales-from-acorn-wood-three-lift-the-flap-stories.pdf
    • http://riverside-resort.net/1/waec-mathematics-questions-and-answers-2017.pdf
    • http://riverside-resort.net/1/way-with-words-language-and-culture-in-tokelau-society.pdf
    • http://uncpbisdegree.com/1/spanish-2-3b-8-answers.pdf
    • http://uncpbisdegree.com/1/stormy-weather-ks1-sats.pdf
    • http://uncpbisdegree.com/1/solution-manual-physics-5th-edition.pdf
    • http://riverside-resort.net/1/what-does-it-mean-when-your-lungs-are-white.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://www.baseball-reference.com/players/g/gosean01.shtml
    • https://www.baseball-reference.com/players/g/greensh02.shtml
    • https://www.opentable.com/stone-brewing-world-bistro-and-gardens?page=1
    • http://www.microsofttranslator.com/bv.aspx?ref=SERP&br=ro&mkt=en-US&dl=en&lp=JA_EN&a=http%3a%2f%2fwww.kahoufudousan.com%2fads%2falbum%2falbum.cgi%3fmode%3ddetail%26id%3d133
    • 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_off00004025.bin
23a9d1c78196cc9f8ccdbe95d918429aa71fc3d7bc0610e745fa3bce868d8278		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4025 10520 bytes
font_01_sfnt_off0000618b.bin
a11fef9b6cf885faa5e36b661e991262018114c7ff2136b1f4238b80ae327584		 pdf-font-stream PDF embedded font (sfnt) at offset 0x618B 7080 bytes

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