Malicious PDF — malware analysis report

Static analysis result for SHA-256 f75a749e1cf56ff2…

MALICIOUS

PDF

44.0 KB Created: 2018-06-11 09:28:52 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7)
MD5: e0eb92b9679804642e3c70a6c053c045 SHA-1: ec569f93a28f72144823527c853a80f0eb24ac8e SHA-256: f75a749e1cf56ff29c69d72e3f7a76dad827c36ca8617a244fabe7d2d6e0b9c1
102 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a fake download lure, specifically targeting SEO poisoning. The document body and extracted URLs point to suspicious domains designed to trick users into downloading a file. The primary malicious URL identified is http://uncpbisdegree.com/download3.php?q=zagreba-ka-pri-a.pdf.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9173

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=zagreba-ka-pri-a.pdf
    • http://uncpbisdegree.com/download4.php?q=zagreba-ka-pri-a.pdf
    • http://twitchtetris.com/reads-online/zagreba-ka-pri-a.pdf
    • http://drabbi.de/zagreba/ka/zagreba_ka_pri_a.pdf
    • http://hikaye.de/zagreba/ka/zagreba_ka_pri_a.pdf
    • http://giseye.de/zagreba/ka/zagreba_ka_pri_a.pdf
    • http://www.rebelprincessreader.com/cdn/2018/files/zagreba-ka-pri-a.pdf
    • http://www.aoraj.com/reads-online/zagreba-ka-pri-a.pdf
    • http://membersmart.com/zagreba~3269/zagreba~ka~pri~a.html
    • http://elegancetechnology.net/file/pdf/zagreba-ka-pri-a.pdf
    • http://dentistabrugherio.com/file/zagreba-ka-pri-a.pdf
    • http://oclair.de/zagreba/ka/zagreba_ka_pri_a.pdf
    • http://gandrama.com/reads-online/zagreba-ka-pri-a.pdf
    • http://www.mybrightday.com/reads-online/zagreba-ka-pri-a.pdf
    • http://uncpbisdegree.com/1/toyota-sienta-service-manual.pdf
    • http://uncpbisdegree.com/1/vercillo-michael-t-md.pdf
    • http://uncpbisdegree.com/1/uc-international.pdf
    • http://uncpbisdegree.com/1/world-is-a-text-4th-edition-silverman.pdf
    • http://uncpbisdegree.com/1/wiring-a-alternator-for-renewable-energy.pdf
    • http://uncpbisdegree.com/1/to-stir-a-magick-cauldron-witchs-guide-casting-and-conjuring-ravenwolf-silver.pdf
    • http://uncpbisdegree.com/1/vw-golf-1996-wiring.pdf
    • http://uncpbisdegree.com/1/trade-unions-in-china-1949-to-the-present.pdf
    • http://uncpbisdegree.com/1/tourism-pat-grade-11-memorandum-2018.pdf
    • http://uncpbisdegree.com/1/thomas-story-time-26-noisy-stafford.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://go.microsoft.com/fwlink/?LinkID=617350
    • 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_off00006413.bin
14a1f796f3b8120e441a879e56bb62c7315aab9a7c307c9a04269e5c55c78cd4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6413 14088 bytes
font_01_sfnt_off00008f4a.bin
b58f00eb31fe4a211d1a8b8c8df1562a0bf5d81661a22350c072f09d50abd33d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F4A 7412 bytes

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