Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad73f5db5bfd7e9d…

MALICIOUS

PDF

47.5 KB Created: 2021-06-07 14:55:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 13c4bf7220fac4e1b65c6d49c1e6f3f4 SHA-1: 7bf3bab2d8c52f3c0bf3cbb2c68c56afc90f57be SHA-256: ad73f5db5bfd7e9d14fb1eaf135dfc8e3032275633d6bba680b5f4268d27ecf3
300 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1204.002 Malicious Link

The PDF document contains a lure for a 'free generator / game hack' which redirects to malicious infrastructure. It also presents a fake CAPTCHA with instructions to paste commands into a shell, indicating a social engineering attack designed to trick users into executing arbitrary commands. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

Heuristics 7

  • 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 with command-running instructions critical SE_FAKE_CAPTCHA_CLICKFIX
    Document combines fake CAPTCHA or human-verification language with instructions to paste or run a command — a high-confidence ClickFix pattern
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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 https://netcdn.tw/app/431946152/how-to-get-a-free-valk-on-roblox-game-hack In PDF document text
    • http://aks-akk.ac.id/html/perpusakk/repository/how-to-hack-in-to-builder-mans-acount-roblox_GM431946152.pdfIn PDF document text
    • http://aks-akk.ac.id/html/perpusakk/repository/roblox-how-to-hack-other-peoples-accounts_GM431946152.pdfIn PDF document text
    • http://aks-akk.ac.id/html/perpusakk/repository/how-to-get-free-robux-copy-and-paste-2021_GM431946152.pdfIn PDF document text
    • http://aks-akk.ac.id/html/perpusakk/repository/anti-ban-and-kick-cheat-roblox_GM431946152.pdfIn PDF document text
    • http://aks-akk.ac.id/html/perpusakk/repository/free-robux-quis_GM431946152.pdfIn PDF document text
    • http://aks-akk.ac.id/html/perpusakk/repository/roblox-to-play-games-for-free_GM431946152.pdfIn PDF document text
    • http://aks-akk.ac.id/html/perpusakk/repository/52-000-000-robux-free_GM431946152.pdfIn PDF document text
    • http://aks-akk.ac.id/html/perpusakk/repository/roblox-system32-host-hack_GM431946152.pdfIn PDF document text
    • http://aks-akk.ac.id/html/perpusakk/repository/free-roblox-face-accessories_GM431946152.pdfIn PDF document text
    • http://aks-akk.ac.id/html/perpusakk/repository/nopde-engine-64-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://aks-akk.ac.id/html/perpusakk/repository/how-to-hack-a-a-roblox-account_GM431946152.pdfIn PDF document text
    • http://aks-akk.ac.id/html/perpusakk/repository/classic-builders-club-roblox-free_GM431946152.pdfIn PDF document text
    • http://aks-akk.ac.id/html/perpusakk/repository/free-robux-hack-tool_GM431946152.pdfIn PDF document text
    • http://aks-akk.ac.id/html/perpusakk/repository/grandz-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://aks-akk.ac.id/html/perpusakk/repository/robux-hack-pc_GM431946152.pdfIn PDF document text
    • http://aks-akk.ac.id/html/perpusakk/repository/safe-free-robux-no-password-or-human-verification_GM431946152.pdfIn PDF document text
    • http://aks-akk.ac.id/html/perpusakk/repository/how-to-get-free-tix-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://aks-akk.ac.id/html/perpusakk/repository/roblox-fly-hack-cheat-engine_GM431946152.pdfIn PDF document text
    • http://aks-akk.ac.id/html/perpusakk/repository/free-modded-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • http://aks-akk.ac.id/html/perpusakk/repository/how-to-hack-a-roblox-account-2021-easy_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
font_00_sfnt_off00005287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5287 26032 bytes
SHA-256: 3e934f426477efdb3e1e59029b97bb8705f786a67af5786d447a11e2d3cee829
font_01_sfnt_off00008b95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B95 2820 bytes
SHA-256: d88f25cfe237a714f996150a11dd8a058f0f7c3e9d1ae91c17b46c10409b6c0b
font_02_sfnt_off00009530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9530 18748 bytes
SHA-256: 60fed822cbe96a7f2235357cf79ffe6ed1584ba0bc0fa3e11ff34223d894d873

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