Malicious PDF — malware analysis report

Static analysis result for SHA-256 50a4ac9a6ff9d85b…

MALICIOUS

PDF

45.4 KB Created: 2021-06-11 11:11:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 837a908c4982af0e5650eb2c6fa25f29 SHA-1: 30f4d9f431a7d817b51ad5ee0867425851ef59ed SHA-256: 50a4ac9a6ff9d85b58b128a3bfbf5f721858f614273efd5336f4f49485b1572d
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to a known malicious redirector infrastructure, specifically advertising 'Roblox Account Stealing Hack'. The document body and heuristics indicate a lure for game-related cheats or hacks, likely leading to credential harvesting or further malware. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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
  • 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.tw/app/431946152/roblox-account-stealing-hack-pastebin-game-hack In PDF document text
    • http://pustaka.biologi.fmipa.unand.ac.id/repository/minecraft-free_GM479516143.pdfIn PDF document text
    • http://pustaka.biologi.fmipa.unand.ac.id/repository/cch-ly-robux-free-tren-dien-thoai_GM431946152.pdfIn PDF document text
    • http://pustaka.biologi.fmipa.unand.ac.id/repository/free-robux-websites-that-actually-work_GM431946152.pdfIn PDF document text
    • http://pustaka.biologi.fmipa.unand.ac.id/repository/cheat-pour-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.biologi.fmipa.unand.ac.id/repository/earn-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.biologi.fmipa.unand.ac.id/repository/minecraft-apk-download-v1-144-2-free_GM479516143.pdfIn PDF document text
    • http://pustaka.biologi.fmipa.unand.ac.id/repository/download-roblox-font-free_GM431946152.pdfIn PDF document text
    • http://pustaka.biologi.fmipa.unand.ac.id/repository/no-verification-for-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.biologi.fmipa.unand.ac.id/repository/buy-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.biologi.fmipa.unand.ac.id/repository/ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.biologi.fmipa.unand.ac.id/repository/robux-free-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.biologi.fmipa.unand.ac.id/repository/freer-tiktok_GM835599320.pdfIn PDF document text
    • http://pustaka.biologi.fmipa.unand.ac.id/repository/free-roblox-hack_GM431946152.pdfIn PDF document text
    • http://pustaka.biologi.fmipa.unand.ac.id/repository/minecraft-mods-download-free_GM479516143.pdfIn PDF document text
    • http://pustaka.biologi.fmipa.unand.ac.id/repository/minecraft-skins-free-girl_GM479516143.pdfIn PDF document text
    • http://pustaka.biologi.fmipa.unand.ac.id/repository/hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.biologi.fmipa.unand.ac.id/repository/how-to-hack-a-roblox-account-easy_GM431946152.pdfIn PDF document text
    • http://pustaka.biologi.fmipa.unand.ac.id/repository/robux-com-free_GM431946152.pdfIn PDF document text
    • http://pustaka.biologi.fmipa.unand.ac.id/repository/free-robux-cheat-no-survey_GM431946152.pdfIn PDF document text
    • http://pustaka.biologi.fmipa.unand.ac.id/repository/free-robux-apps-that-actually-work_GM431946152.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_004_off00005181.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5181 25700 bytes
SHA-256: 7c16b18196b828ba435bdeda575106990c4f00ff01355ee2e0713ae5bf76a28d
font_01_sfnt_off00008ca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CA8 18988 bytes
SHA-256: 6f90cdf5baab794f6a9738c7150850b48df08281196b8884a4d086c22dd87044

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