Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dda809c5d000107…

MALICIOUS

PDF

42.7 KB Created: 2021-04-26 10:00:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 809a03c3aed515c8a82b13df1cb5baf2 SHA-1: e347373081a444d0620b6f6488e256bf10be461e SHA-256: 4dda809c5d00010724defc03b0280ae89c6f2b18bff7f62a7078ee62704fe1ce
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document employs social engineering by impersonating Facebook and offering a 'Robux Hack' to entice users to click a malicious link. This lure is a common tactic for credential phishing or malware distribution. The document contains embedded URLs that redirect to a suspicious domain, likely serving as a landing page for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

Heuristics 6

  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • 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
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.xyz/app/431946152/quick-way-to-get-robux-hack-game-hack.
  • 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://netcdn.xyz/app/431946152/quick-way-to-get-robux-hack-game-hack PDF link annotation
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/roblox-get-free-gear.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/speed-hack-roblox-2021.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/free-roblox-toy-june-2021.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/hack-gratis-robux.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/roblox-lumber-tycoon-2-money-hack-script.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/free-robux-and-builderclub.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/roblox-acount-info-hack-with-robux.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/free-roblox-app-for-ipad.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/free-bc-roblox-2021.pdfIn PDF document text
    • http://www.technibuild-group.com/uploaded_files/userfiles/files/cheat-in-rake-roblox.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004465.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4465 26592 bytes
SHA-256: 2c4fa7f7fe7907fa8aad6295ab3b65b3d1c8f9258758d1b06d17e3ced61657a4
font_01_sfnt_off000082e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82E4 19008 bytes
SHA-256: adcdfbfc3fb0fce0a02196040b8776cea45d687a048edcf6e976c45a5f95236c

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