Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc49ac2fb101866c…

MALICIOUS

PDF

34.1 KB Created: 2021-07-06 09:22:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 48d41a17aaa9520066ace2d167be1f93 SHA-1: fd63750e9f0a2cb652229a4a3489bf6aa1f47b00 SHA-256: bc49ac2fb101866c374653c5751bc5f9a2bbbf91c81af2f0384277b6f93bddf8
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically advertising free game hacks and in-game currency for popular games like Roblox and Coin Master. The document body and heuristics indicate a lure to download or access these 'hacks', which likely leads to malware or further phishing attempts. No scripts were extracted from this sample, but the embedded URLs and the nature of the lures strongly suggest a phishing or malware distribution campaign.

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.
  • 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 http://netcdn.tw/app/431946152/roblox-premium-free-game-hack In PDF document text
    • http://lib.uho.ac.id/library/repository/hack-para-tener-robux-infinitos_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-hack-app_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-free-coins-and-spins-app_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/hack-coin-master-apk-download_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/roblox-free-play_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/roblox-fallen-hacks_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-robux-groups-2021_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-free-bonus_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/today-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/roblox-eat-or-diy-game-hack_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-hack-no-human-verification-2021_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-minecraft-skins-pc_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/minecraft-free-install_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/roblox-free-download-no-sign-up_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-robux-without-password-or-email_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/castle-black-free-to-take-roblox_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-can-i-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/minecraft-hack-mod_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/woman-roblox_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/roblox-free-robux-no-survey-no-save-no-subscription_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_off00002da9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DA9 22260 bytes
SHA-256: 3cf8948e37e32247244017f456903a9f4865fe07de730c8b6d9d095039baa84e
font_01_sfnt_off00005f71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F71 19324 bytes
SHA-256: c8a2b1ae1c1508803a3d8c69ed3754c7f46d1063272e7458056edfc0801350b1

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