Malicious PDF — malware analysis report

Static analysis result for SHA-256 23db4d57e2b831b5…

MALICIOUS

PDF

39.9 KB Created: 2021-04-22 16:36:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 6c9058f6eb1b648daf661ff44a882513 SHA-1: 2f9a7c90760dbd0ffe8aeea469b6fee1912d385b SHA-256: 23db4d57e2b831b50362ec1151f79b87b942d9a660112bf083768a14731d38e5
90 Risk Score

Malware Insights

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

The PDF document contains heuristics indicating it's a browser extension installation lure, promising free in-game currency. It also contains an external URI pointing to a similar lure. While no scripts were extracted, the combination of the lure and the external URI suggests a social engineering attack aimed at tricking the user into downloading and installing malicious content or providing credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9215

Heuristics 5

  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 https://netsecure.pro/app/431946152/robux-free-generator-no-survey-legit-game-hack
    • https://comunidaddeatencion.argentina.gob.ar/ckfinder/userfiles/files/how-to-get-free-group-funds-on-roblox.pdf
    • https://comunidaddeatencion.argentina.gob.ar/ckfinder/userfiles/files/devil-roblox-hack.pdf
    • https://comunidaddeatencion.argentina.gob.ar/ckfinder/userfiles/files/descargar-hack-de-jailbreak-roblox.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00003df6.bin
ec61354ececda4f812b753bacc5e5cafc95f05280481be39d2e5aa10a7c891ce		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3DF6 25884 bytes
font_01_sfnt_off0000781a.bin
e83028f2bac19fee78065e3e1d553c97797f7b20afbe5b41a4e379e0da7470d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x781A 19048 bytes

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