Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf8ea08cd21ad3c9…

MALICIOUS

PDF

45.8 KB Created: 2021-06-03 03:25:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 3f4cc8bfe14720a1a81fdab42c230360 SHA-1: 9b858bbcd26889c0fc22e7f89265b15b7a5b4002 SHA-256: cf8ea08cd21ad3c998f01f77d5e5d35f5a96d4cc0864d7ca30cdcc35c302d491
200 Risk Score

Malware Insights

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

The PDF document employs a lure of free Robux and displays a fake CAPTCHA to trick users into clicking a malicious link. This link redirects to infrastructure known for distributing malware. The document's structure and embedded links suggest an attempt to exploit user interest in online games and virtual currency to deliver a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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/how-to-get-free-robux-on-roblox-2021-no-hacks-game-hack In PDF document text
    • https://emindonesia.com/assets/CKImages/files/rbxoffer-com-free-robux_GM431946152.pdfIn PDF document text
    • https://emindonesia.com/assets/CKImages/files/100-free-tiktok-followers_GM835599320.pdfIn PDF document text
    • https://emindonesia.com/assets/CKImages/files/how-to-download-minecraft-windows-10-edition-for-free_GM479516143.pdfIn PDF document text
    • https://emindonesia.com/assets/CKImages/files/coin-master-coins_GM406889139.pdfIn PDF document text
    • https://emindonesia.com/assets/CKImages/files/minecraft-client_GM479516143.pdfIn PDF document text
    • https://emindonesia.com/assets/CKImages/files/robux-sign_GM431946152.pdfIn PDF document text
    • https://emindonesia.com/assets/CKImages/files/how-to-hack-coin-master-apple_GM406889139.pdfIn PDF document text
    • https://emindonesia.com/assets/CKImages/files/coin-master-free-100-spin-link_GM406889139.pdfIn PDF document text
    • https://emindonesia.com/assets/CKImages/files/free-robux-redeem-codes_GM431946152.pdfIn PDF document text
    • https://emindonesia.com/assets/CKImages/files/coin-master-hacks_GM406889139.pdfIn PDF document text
    • https://emindonesia.com/assets/CKImages/files/gold-card-coin-master-free_GM406889139.pdfIn PDF document text
    • https://emindonesia.com/assets/CKImages/files/free-followers-for-tiktok_GM835599320.pdfIn PDF document text
    • https://emindonesia.com/assets/CKImages/files/minecraft-net-free_GM479516143.pdfIn PDF document text
    • https://emindonesia.com/assets/CKImages/files/robux-hack-free-robux_GM431946152.pdfIn PDF document text
    • https://emindonesia.com/assets/CKImages/files/haktuts-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://emindonesia.com/assets/CKImages/files/roblox-free-items-2021_GM431946152.pdfIn PDF document text
    • https://emindonesia.com/assets/CKImages/files/master-free-spin-and-coin-link_GM406889139.pdfIn PDF document text
    • https://emindonesia.com/assets/CKImages/files/free-coin-coin-master_GM406889139.pdfIn PDF document text
    • https://emindonesia.com/assets/CKImages/files/master-coin-hack_GM406889139.pdfIn PDF document text
    • https://emindonesia.com/assets/CKImages/files/can-i-get-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
stream_004_off0000529d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x529D 25740 bytes
SHA-256: b975091afbf696b62c4ae05576baf444f9d4d905dab779621e1b016bdc739d2e
font_01_sfnt_off00008dd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DD5 19156 bytes
SHA-256: 2462996386ed1115a9dd9ca05818c859f61544cf43332d5c207d4a8b8e9447cc

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