Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b2e403d953dab90…

MALICIOUS

PDF

36.6 KB Created: 2021-07-04 21:38:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 56667d01d9cf64cadf183b263005fd62 SHA-1: 59d86f51c4010980daa45b0fb8708f5c6933c3d9 SHA-256: 2b2e403d953dab9065c4fe7f9a08ad5764e115997a6a9c2320aab81f26dc1676
122 Risk Score

Malware Insights

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

The PDF document employs a fake CAPTCHA lure to deceive users into clicking on links that redirect to game hack generators. This tactic is commonly used to mask the distribution of malicious payloads. The embedded URLs point to various game-related hacks, suggesting a lure for users seeking cheats or in-game currency. While no scripts were directly extracted, the PDF structure and heuristics indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://netcdn.tw/app/431946152/free-roblox-girl-clothes-game-hack PDF link annotation
    • https://mbbs.hr/files/free-roblox-com_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/how-to-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/coin-master-hack-https-coinms-net_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/roblox-rub-hack-generator-no-survey_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/how-to-hack-coin-master-with-root_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/roblox-xeno-hack_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/roblox-cheats-on-phone_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/roblox-obby-free-robux_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/coin-master-fun-free-spins_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/coin-master-free-spins-today-daily-links_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/minecraft-free-minecoins_GM479516143.pdfIn PDF document text
    • https://mbbs.hr/files/roblox-free-download-pc-windows7_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/free-fire-roblox_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/blox-fish-free-robux_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/free-roblox-toys_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/free-coins-coin-master-link_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/no-scam-free-robux_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/my-minecraft-account-was-hacked_GM479516143.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_off000039c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x39C0 21964 bytes
SHA-256: bf57a8b598958b8e13dd31c95cae18d0a599cd6a1ea18cffaf6769fad643c7b2
font_01_sfnt_off00006a72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A72 19040 bytes
SHA-256: e4b7cba3e067a7044ad6dca389c66fcc061b9f368da1002b1e58509ce7860c7a

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