Malicious PDF — malware analysis report

Static analysis result for SHA-256 21515bb35118cb70…

MALICIOUS

PDF

34.4 KB Created: 2021-07-05 18:08:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 88a22d6d0496c6247e49d752c0e6a177 SHA-1: feb0f4b1911843f613d00001a292d8da7cf9a226 SHA-256: 21515bb35118cb70b40edb89db7c430e2484d8f0dfc8ac2da8d978274110c517
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document employs a common lure of 'free Robux' and game hacks to entice users. It contains an embedded URI pointing to a suspicious domain, 'netcdn.tw', which is flagged as a redirector for potentially malicious content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the overall pattern suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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://netcdn.tw/app/431946152/free-robux-no-humen-varucashe-game-hack PDF link annotation
    • https://digilib.stieama.ac.id/repository/packet-of-world-free-robux_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/coin-master-hack-tool-v1-9-apk_GM406889139.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/auto-hacker-roblox_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/free-robux-ohne-handynummer_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/how-to-get-verified-on-tiktok-for-free_GM835599320.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/hack-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/free-robux-without-sever_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/roblox-hack-generator-robux_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/free-roblox-accounts-with-obc-2021-discord_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/how-to-get-minecraft-java-for-free_GM479516143.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/hacks-to-get-money-on-roblox_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/be-skeptical-of-roblox-free-robux_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/free-robux-not-fake_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/coin-master-free-spins-link-blogspot-today_GM406889139.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/free-spin-link-coin-master-today_GM406889139.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/roblox-hack-how-to-get-free-robux-unlimited-100-working_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/roblox-roghoul-legendary-hack_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/how-to-get-free-robux-without-email_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/how-to-get-400-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://digilib.stieama.ac.id/repository/admin-hack-roblox-exploit_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
font_00_sfnt_off00002f5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F5B 22268 bytes
SHA-256: 0bc8dcd6e7afcfc2b88e2ea8724231c9157a5471e60ad83c00406d11fcc8a41e
font_01_sfnt_off000060ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60EC 19276 bytes
SHA-256: 61b52c6890a71de9e623e222172d3dd80e37f6f5c9ec3299807d23d099e16090

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