Malicious PDF — malware analysis report

Static analysis result for SHA-256 455963f3552fb4ed…

MALICIOUS

PDF

47.7 KB Created: 2021-05-12 09:33:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 6ba7b7d1cf089f979f48d1fea404e273 SHA-1: 8e3a3404d8be71b5bb51ccc628fb636500f74feb SHA-256: 455963f3552fb4edc65332bf36734f3d8d1dc1c392f0f380281e89dcb2922a70
122 Risk Score

Malware Insights

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

This PDF document employs a fake CAPTCHA lure to trick users into clicking malicious links, disguised as game hacks. The embedded URLs point to sites offering 'free generators' and 'hacks' for popular games, which likely serve as a delivery mechanism for further malicious content. The document's structure and the nature of the lures suggest an attempt to exploit user interest in game cheating for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9013

Heuristics 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/how-to-hack-robux-game-hack PDF link annotation
    • https://www.clinicalsim.com/uploaded_files/userfiles/files/free-robux-no-verify-2021_GM431946152.pdfIn PDF document text
    • https://www.clinicalsim.com/uploaded_files/userfiles/files/free-draw-2-roblox_GM431946152.pdfIn PDF document text
    • https://www.clinicalsim.com/uploaded_files/userfiles/files/robux-free-promo-codes_GM431946152.pdfIn PDF document text
    • https://www.clinicalsim.com/uploaded_files/userfiles/files/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://www.clinicalsim.com/uploaded_files/userfiles/files/coin-master-pc-hack-download_GM406889139.pdfIn PDF document text
    • https://www.clinicalsim.com/uploaded_files/userfiles/files/roblox-rape-hack_GM431946152.pdfIn PDF document text
    • https://www.clinicalsim.com/uploaded_files/userfiles/files/robux-scam_GM431946152.pdfIn PDF document text
    • https://www.clinicalsim.com/uploaded_files/userfiles/files/roblox-arsenal-hacks-download_GM431946152.pdfIn PDF document text
    • https://www.clinicalsim.com/uploaded_files/userfiles/files/multiplayer-master-hack-coins_GM406889139.pdfIn PDF document text
    • https://www.clinicalsim.com/uploaded_files/userfiles/files/free-cheat-codes-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.clinicalsim.com/uploaded_files/userfiles/files/how-to-make-a-minecraft-server-for-free-java_GM479516143.pdfIn PDF document text
    • https://www.clinicalsim.com/uploaded_files/userfiles/files/how-do-you-get-roebucks_GM431946152.pdfIn PDF document text
    • https://www.clinicalsim.com/uploaded_files/userfiles/files/coin-master-daily-gift-free-spins-and-coins-link-today_GM406889139.pdfIn PDF document text
    • https://www.clinicalsim.com/uploaded_files/userfiles/files/coin-master-free-account_GM406889139.pdfIn PDF document text
    • https://www.clinicalsim.com/uploaded_files/userfiles/files/krnl-roblox_GM431946152.pdfIn PDF document text
    • https://www.clinicalsim.com/uploaded_files/userfiles/files/coin-master-fan-page-free-spins_GM406889139.pdfIn PDF document text
    • https://www.clinicalsim.com/uploaded_files/userfiles/files/real-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://www.clinicalsim.com/uploaded_files/userfiles/files/how-to-get-minecraft-dungeons-for-free_GM479516143.pdfIn PDF document text
    • https://www.clinicalsim.com/uploaded_files/userfiles/files/free-ways-to-get-robux_GM431946152.pdfIn PDF document text
    • https://www.clinicalsim.com/uploaded_files/userfiles/files/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004ba6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BA6 28996 bytes
SHA-256: c264f5f5c651b8e7d517bb08772be0e49ab815fdedd21689c9569c3929f44225
font_01_sfnt_off00008da1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DA1 2892 bytes
SHA-256: c2578a292634a901613c1dd9f9883dd4930e6811e59ae03d696f263e56ea17b4
font_02_sfnt_off0000978a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x978A 18412 bytes
SHA-256: 799ae8847f356c5b4d712fc876b96dd84d848442331064266ecb6e470ae97e62

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