Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c4d2b6515119ddb…

MALICIOUS

PDF

35.3 KB Created: 2021-07-04 15:46:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: e80548dd06090699eac6753a9d10d8d2 SHA-1: 200c7bc7855525293772037ff2c9c6ef9a2fb5d8 SHA-256: 2c4d2b6515119ddb0fd1f9cdd29084067b384187fc612e74cbd362551a90322c
200 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to a malicious redirector, specifically advertising a 'real Roblox game hack'. The document body and extracted URLs reinforce this, pointing to various game-related cheats and free items, likely as a lure. The fake CAPTCHA heuristic suggests the user is expected to interact with the document, potentially by clicking the malicious link to bypass a fake verification step, which would then lead to the redirector.

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.tw/app/431946152/real-roblox-game-hack In PDF document text
    • https://laokhwanhos.com/ckfinder/userfiles/files/free-minecraft-skins-pc_GM479516143.pdfIn PDF document text
    • https://laokhwanhos.com/ckfinder/userfiles/files/coin-master-free-spins-hack_GM406889139.pdfIn PDF document text
    • https://laokhwanhos.com/ckfinder/userfiles/files/free-robux-no-downloading-apps_GM431946152.pdfIn PDF document text
    • https://laokhwanhos.com/ckfinder/userfiles/files/how-to-get-2021-robux-for-free_GM431946152.pdfIn PDF document text
    • https://laokhwanhos.com/ckfinder/userfiles/files/robux-com-free_GM431946152.pdfIn PDF document text
    • https://laokhwanhos.com/ckfinder/userfiles/files/premium-softwares-com-roblox-hack_GM431946152.pdfIn PDF document text
    • https://laokhwanhos.com/ckfinder/userfiles/files/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://laokhwanhos.com/ckfinder/userfiles/files/free-coin-master-links_GM406889139.pdfIn PDF document text
    • https://laokhwanhos.com/ckfinder/userfiles/files/how-to-earn-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://laokhwanhos.com/ckfinder/userfiles/files/free-premium-roblox_GM431946152.pdfIn PDF document text
    • https://laokhwanhos.com/ckfinder/userfiles/files/hack-master-coin-pc_GM406889139.pdfIn PDF document text
    • https://laokhwanhos.com/ckfinder/userfiles/files/hacked-warning-roblox-id_GM431946152.pdfIn PDF document text
    • https://laokhwanhos.com/ckfinder/userfiles/files/roblox-promocodes-with-free-robux_GM431946152.pdfIn PDF document text
    • https://laokhwanhos.com/ckfinder/userfiles/files/ipod-roblox-hack_GM431946152.pdfIn PDF document text
    • https://laokhwanhos.com/ckfinder/userfiles/files/free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • https://laokhwanhos.com/ckfinder/userfiles/files/microsoft-bing-robux_GM431946152.pdfIn PDF document text
    • https://laokhwanhos.com/ckfinder/userfiles/files/free-robux-now_GM431946152.pdfIn PDF document text
    • https://laokhwanhos.com/ckfinder/userfiles/files/free-robux-glitch-no-hack_GM431946152.pdfIn PDF document text
    • https://laokhwanhos.com/ckfinder/userfiles/files/todays-free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • https://laokhwanhos.com/ckfinder/userfiles/files/how-to-earn-free-robux_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_off0000347f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x347F 22404 bytes
SHA-256: a3884daf7f3285afa0cb5474efcd42833657780282b4fa6cb8324db0ee2078d2
font_01_sfnt_off0000665b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x665B 18484 bytes
SHA-256: 7f0f55fb7efe68b4890159f191db407b63f8f65986d021ee8cd072538b6ccf6b

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