Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4fde9386fd53d63…

MALICIOUS

PDF

34.6 KB Created: 2018-06-11 10:01:25 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7)
MD5: 97f50febd5f31dffddca5bcd9620cd74 SHA-1: 97732f23751ba15e8b97b9d66db3c949fde4a7d9 SHA-256: d4fde9386fd53d633f42816a27c545923796a3f58a6f7b5d445285ff05b3140c
102 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a fake download lure, specifically using SEO poisoning to trick users into downloading a file. The embedded URLs and document body text point to a malicious gateway at 'uncpbisdegree.com', which is likely serving a secondary payload. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9395

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=target-publication-physics-all-chapter.pdf
    • http://uncpbisdegree.com/download4.php?q=target-publication-physics-all-chapter.pdf
    • http://www.4ono.com/cbse-12th-physics-important-questions-20161718/
    • http://perfectgolfswingreview.net/impact.htm
    • http://www.journalcra.com/
    • http://www.tei-c.org/release/doc/tei-p5-doc/en/html/HD.html
    • https://www.pacode.com/secure/data/025/chapter250/chap250toc.html
    • http://opengarages.org/handbook/ebook/
    • http://www.leg.state.fl.us/Statutes/index.cfm?App_mode=Display_Statute&URL=0500-0599/0501/0501.html
    • http://indianjournals.com/ijor.aspx?target=journals_list&type=alpha
    • http://jmccsci.com/
    • http://www.aspbs.com/
    • http://4rie.com/
    • http://friesian.com/hist-1.htm
    • http://mh370.radiantphysics.com/2018/01/21/the-search-for-mh370-begins-again/
    • http://uncpbisdegree.com/1/wiring-diagrams-mitsubishi-triton.pdf
    • http://uncpbisdegree.com/1/ww2-holocaust.pdf
    • http://uncpbisdegree.com/1/vocopro-da-3700user-manual.pdf
    • http://uncpbisdegree.com/1/unit-4-macroeconomics-sample-multiple-choice-answers.pdf
    • http://uncpbisdegree.com/1/women-politicians-and-the-media.pdf
    • http://uncpbisdegree.com/1/wordly-wise-3000-book-8-lesson-4-answer-key.pdf
    • http://uncpbisdegree.com/1/valuvision-coupons.pdf
    • http://uncpbisdegree.com/1/the-triad-a-tale-of-lean-agile-acceptance-test-driven-development.pdf
    • http://uncpbisdegree.com/1/thutong-grade-11-term-1-geography-practise-papers.pdf
    • http://uncpbisdegree.com/1/volvo-d12-ecu-wiring.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://www.benjamins.com/
    • http://dx.doi.org/
    • https://arxiv.org/list/physics/new
    • https://en.wikipedia.org/wiki/Bogdanov_affair
    • http://www.physicsclassroom.com/Teacher-Toolkits/Newtons-First-Law/Newtons-First-Law-Complete-ToolKit
    • https://www.sciencedirect.com/science/article/pii/S037015731000308X
    • http://www.w3.org/Graphics/SVG/IG/resources/svgprimer.html
    • https://www.nap.edu/
    • http://www.globalissues.org/article/535/what-are-journalists-for
    • https://link.springer.com/
    • http://www.uspto.gov/web/offices/pac/mpep/s608.html
    • http://regulations.delaware.gov/AdminCode/title24/2500.shtml
    • https://onlinelibrary.wiley.com/doi/full/10.1029/2007WR006200
    • 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://en.wikipedia.org/wiki/Interstellar_
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004b3f.bin
5ac93cb561362a05b72b537061e9174425a48e3c7bbe3c24cc57cdd72b830f17		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B3F 10096 bytes
font_01_sfnt_off00006b6a.bin
1a3f2cb811a6ea81ace159a35026bee2334d7c138d3c882c1e3a1fe661624776		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B6A 7408 bytes

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