Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac662666a43af159…

MALICIOUS

PDF

27.4 KB Created: 2018-06-11 09:24:01 -04:00 Authoring application: wkhtmltopdf 0.12.4 (via Qt 4.8.7)
MD5: 163d70524dc57a9f64069bc722d5e372 SHA-1: bd0ce24592f3f00c13c533f93b071a4c583f2e9c SHA-256: ac662666a43af1597230935f23892d9ba4d0bfc444d8b915247aef358c8c416c
80 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File

The PDF document contains embedded links and a visible call-to-action button, suggesting a social engineering lure. The ML classifier flagged this PDF as malicious with high confidence. The presence of a 'Visible LOLBin command execution instruction' heuristic indicates that the document may attempt to execute commands or scripts, likely to download a second-stage payload from one of the suspicious URLs found in the document body.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9664

Heuristics 4

  • Visible LOLBin command execution instruction high SE_LOLBIN_RUN_COMMAND
    Document contains instructions or visible command text involving Windows script/execution tools such as PowerShell, mshta, cmd, rundll32, or regsvr32
  • 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=welby-hair-curlersuser-manual.pdf
    • http://uncpbisdegree.com/download4.php?q=welby-hair-curlersuser-manual.pdf
    • http://uncpbisdegree.com/1/text-book-of-statics.pdf
    • http://uncpbisdegree.com/1/session-4-learn-key-excel-answers.pdf
    • http://uncpbisdegree.com/1/series-guide-app.pdf
    • http://uncpbisdegree.com/1/the-end-of-your-world-uncensored-straight-talk-on-nature-enlightenment-audio-cd-adyashanti.pdf
    • http://uncpbisdegree.com/1/the-complete-tolkien-companion.pdf
    • http://uncpbisdegree.com/1/the-drowned-life-jeffrey-ford.pdf
    • http://riverside-resort.net/1/vampire-rising-alex-van-helsing-1-jason-henderson.pdf
    • http://uncpbisdegree.com/1/textiles-basic-swatch-kit-answer-key.pdf
    • http://uncpbisdegree.com/1/sunbeam-breadmaker-5890-user-manual.pdf
    • http://riverside-resort.net/1/york-chillers-ycak-service-manual.pdf
    • 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000030ce.bin
4344bcd4fdd55eedf7458a90205070d25e687aaf79464118a9365cccf431e8ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x30CE 10412 bytes
font_01_sfnt_off000051c7.bin
61d6bdd44dc07ca0a24f52a063cec1d79f93d7388b5e971575d706e6dec8f937		 pdf-font-stream PDF embedded font (sfnt) at offset 0x51C7 7160 bytes

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