Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8765e91f7c3f8d5…

MALICIOUS

PDF

31.9 KB Created: 2021-07-03 15:31:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 80b7151feffc4edacd458f8c49d5005f SHA-1: a6979a8890a7d27b18e8f802ebe6c9a6d85be717 SHA-256: b8765e91f7c3f8d5a99131bc281b44739cf7dcaf3b81120f769c0dc99dfccc4b
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs and a document body that explicitly advertises 'hacks' and 'free items' for games, aiming to trick users into downloading further content. The ML classifier also flagged this PDF as malicious. While no scripts were directly extracted, the presence of external URLs suggests a downloader or redirector pattern, likely leading to a second-stage payload. The document's content and embedded links strongly indicate a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: http://netcdn.tw/app/431946152/hack-robux-game-hack.
  • 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/hack-robux-game-hack In PDF document text
    • http://preverjaboticabal.com.br/assets/uploads/canal_alpha/files/coin-drop-master-free_GM406889139.pdfIn PDF document text
    • http://preverjaboticabal.com.br/assets/uploads/canal_alpha/files/how-to-get-roblox-gift-cards-for-free_GM431946152.pdfIn PDF document text
    • http://preverjaboticabal.com.br/assets/uploads/canal_alpha/files/tiktok-free-names_GM835599320.pdfIn PDF document text
    • http://preverjaboticabal.com.br/assets/uploads/canal_alpha/files/minecraft_GM479516143.pdfIn PDF document text
    • http://preverjaboticabal.com.br/assets/uploads/canal_alpha/files/egg-farm-sim-roblox-hack-script_GM431946152.pdfIn PDF document text
    • http://preverjaboticabal.com.br/assets/uploads/canal_alpha/files/minecraft-toolbox-premium-apk_GM479516143.pdfIn PDF document text
    • http://preverjaboticabal.com.br/assets/uploads/canal_alpha/files/what-does-the-cheater-cage-do-in-roblox_GM431946152.pdfIn PDF document text
    • http://preverjaboticabal.com.br/assets/uploads/canal_alpha/files/coin-master-free-spins-a2z-help_GM406889139.pdfIn PDF document text
    • http://preverjaboticabal.com.br/assets/uploads/canal_alpha/files/master-coin-hack-apk_GM406889139.pdfIn PDF document text
    • http://preverjaboticabal.com.br/assets/uploads/canal_alpha/files/daily-free-spin-coin-master-link_GM406889139.pdfIn PDF document text
    • http://preverjaboticabal.com.br/assets/uploads/canal_alpha/files/how-to-hack-roblox-top-model-wins_GM431946152.pdfIn PDF document text
    • http://preverjaboticabal.com.br/assets/uploads/canal_alpha/files/download-minecraft-java-edition-free_GM479516143.pdfIn PDF document text
    • http://preverjaboticabal.com.br/assets/uploads/canal_alpha/files/free-coin-master-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://preverjaboticabal.com.br/assets/uploads/canal_alpha/files/roblox-password-finder-hack_GM431946152.pdfIn PDF document text
    • http://preverjaboticabal.com.br/assets/uploads/canal_alpha/files/free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://preverjaboticabal.com.br/assets/uploads/canal_alpha/files/free-robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • http://preverjaboticabal.com.br/assets/uploads/canal_alpha/files/hack-coin-master-download-ios_GM406889139.pdfIn PDF document text
    • http://preverjaboticabal.com.br/assets/uploads/canal_alpha/files/get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://preverjaboticabal.com.br/assets/uploads/canal_alpha/files/best-hack-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://preverjaboticabal.com.br/assets/uploads/canal_alpha/files/freespincoin-masterlinkdownload_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_off00002a9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A9D 21160 bytes
SHA-256: fa978913e0f3b4b784362203eacb0a1936d28a13646ba4831be4efcbae586dd7
font_01_sfnt_off000058a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x58A4 18724 bytes
SHA-256: 3ac7be5af293af38fa349e44a35dc9d744ccac9489df6a6de684f68f531fa54d