Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ef72fd0131747d6…

MALICIOUS

PDF

29.6 KB Created: 2018-06-11 08:36:08 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7)
MD5: 17fbdaa1de77a473e4e16a9af8ffb470 SHA-1: 9441dddd32326c363f059c30b9a0cc484924b902 SHA-256: 6ef72fd0131747d67ac965c680fc790c91b994961798347ebeed6a00ba1b22e0
102 Risk Score

Malware Insights

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

The PDF contains heuristics indicating it is a fake download lure, specifically using SEO poisoning techniques. The embedded URLs point to a domain designed to serve malicious files. The ML classifier also flagged this PDF as malicious with high confidence. No scripts were extracted, but the overall pattern suggests a malicious document intended to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9648

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-heart-of-a-goof-pg-wodehouse.pdf
    • http://uncpbisdegree.com/download4.php?q=the-heart-of-a-goof-pg-wodehouse.pdf
    • http://www.pgwodehousebooks.com/simplebiblio.htm
    • http://www.scottishgolfhistory.org/news/albatross-in-golf/
    • http://www.oldtimetv.net/old-time-radio-uk-comedy-entertainment/
    • http://www.vrcurassow.com/2dvrc/stateofaffairs/circus/2014.html
    • http://riverside-resort.net/1/yanmar-engine-manuals.pdf
    • http://uncpbisdegree.com/1/serway-7th-edition-solution.pdf
    • http://riverside-resort.net/1/wedding-cards-design-games.pdf
    • http://riverside-resort.net/1/world-car-design-of-the-year-2014.pdf
    • http://uncpbisdegree.com/1/spelling-and-thinking-answers-unit-16.pdf
    • http://uncpbisdegree.com/1/telehandler-test-questions-and-answers.pdf
    • http://uncpbisdegree.com/1/tec-ma-156user-manual.pdf
    • http://riverside-resort.net/1/weather-studies-investigations-manual-2015-answer.pdf
    • http://uncpbisdegree.com/1/the-indian-in-the-cupboard-trilogy.pdf
    • http://uncpbisdegree.com/1/the-bird-market-of-paris-a-memoir-nikki-moustaki.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://en.wikipedia.org/wiki/PG_Wodehouse
    • https://en.wikipedia.org/wiki/Jeeves
    • http://tvtropes.org/pmwiki/pmwiki.php/Main/SlidingScaleOfSillinessVersusSeriousness
    • http://tvtropes.org/pmwiki/pmwiki.php/Main/BuffySpeak
    • 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_off0000388a.bin
dc1e22dbe74382e65197c3f9cdffe1bc99b7065450f5614c252788e5a15654d7
pdf-font-stream PDF embedded font (sfnt) at offset 0x388A 10564 bytes
font_01_sfnt_off00005a07.bin
1e47a050699eb69007443ff899ae30c136889c843c48f6da89f1ec155d8c9b65
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A07 7104 bytes