Malicious PDF — malware analysis report

Static analysis result for SHA-256 33b6ec064a8b0c50…

MALICIOUS

PDF

35.1 KB Created: 2021-06-27 03:57:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: af35f590dc5ec2ecc909f20e4c20c0a9 SHA-1: 36522f118a2c1d22e92ac9a21b54fbaf9560d86f SHA-256: 33b6ec064a8b0c50100dbe3385841de6e0937114714928e7d4225afbe30a107e
200 Risk Score

Malware Insights

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

This PDF document employs a fake CAPTCHA lure to trick users into downloading a game hack. It contains multiple links to a malicious redirector infrastructure, which likely serves as a gateway to further malicious content or downloads. The ML classifier strongly flagged this PDF as malicious, supporting the observed redirection and lure techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • 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
  • 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.co/app/431946152/launcher-roblox-hack-dll-game-hack In PDF document text
    • https://fridaytravelnepal.com/userfiles/files/hackear-juego-coin-master_GM406889139.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/free-tiktok-likes-no-survey_GM835599320.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/free-roblox-codes-2021_GM431946152.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/free-spin-app-for-coin-master_GM406889139.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/robux-generator-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/good-free-roblox-clothes_GM431946152.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/coin-master-free-stuff_GM406889139.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/free-simulator-script-roblox_GM431946152.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/free-robux-without-human-verification-real_GM431946152.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/how-to-hack-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/coin-master-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/how-to-get-free-roebucks-without-verification_GM431946152.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/synapse-roblox-free_GM431946152.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/free-spin-and-win-coin-master_GM406889139.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/minecraft-multiplayer-free_GM479516143.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/free-coin-master-game_GM406889139.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/free-robux-no-offers_GM431946152.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/free-unused-robux-codes_GM431946152.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/roblox-steve-one-piece-hack-tp-chest_GM431946152.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/coin-master-free-spins-link-2021_GM406889139.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_off00003292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3292 22244 bytes
SHA-256: f0e8e086100566ba605b032b30a10a8bf7277e5934f92f5914fdda59fd759c10
font_01_sfnt_off000063e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63E2 19128 bytes
SHA-256: 958e8b5a1ec29414432e8a7176d843802e7dc9a3b11deeaa756e3e4bffc56f4b

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