Malicious PDF — malware analysis report

Static analysis result for SHA-256 d21e0df8c00b0060…

MALICIOUS

PDF

48.5 KB Created: 2021-06-03 09:55:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 68f44e28b54e48d1bcbe4d66ceb5c68f SHA-1: ad24b7966c9eaad0f8941ace8d7e80632ed6036b SHA-256: d21e0df8c00b0060daa56a8d9d117c935e28a74cfb1ae731ca156e5692d997fd
200 Risk Score

Malware Insights

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

This PDF document employs a lure related to game hacks and free items to entice users into clicking embedded links. The document displays a fake CAPTCHA, a common tactic to trick users into interacting with malicious content. Several links point to known malicious redirectors and infrastructure, suggesting the primary goal is to distribute further malware or lead users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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 https://netcdn.online/app/431946152/roblox-adopt-me-hacks-2021-game-hack In PDF document text
    • https://purihostel.com/assets/CKImages/files/how-to-change-your-username-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/free-promo-codes-for-roblox-2021_GM431946152.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/20-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/100-robux_GM431946152.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/coin-master-free-coins_GM406889139.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/coin-master-daily-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/coin-master-free-rare-cards_GM406889139.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/free-spins-coin-master-2021-hack_GM406889139.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/can-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/where-tiktok-free-views-apk-download_GM835599320.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/how-to-get-hacks-on-roblox_GM431946152.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/do-you-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/roblox-april-fools-hack_GM431946152.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/coin-master-free-link-app_GM406889139.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/roblox-com-www_GM431946152.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/coin-master-hack-spins-apk_GM406889139.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/free-ways-to-get-robux_GM431946152.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/earn-free-robux_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
stream_004_off00004e5d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E5D 26544 bytes
SHA-256: 91f5217b75d3b902380d61a35df81091dadf89ce751c35a258dbbe954a6ac4af
font_01_sfnt_off00008aa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AA0 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off000097b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97B2 19232 bytes
SHA-256: 0b867ffe8539eae71078bc89a561397ca2d87a89b617cad907cf467b0a006e5c

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