Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1f3b4226f21054e…

MALICIOUS

PDF

250.1 KB Created: 2021-07-04 20:14:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: d7e08d43df96ec35578323865e3c1844 SHA-1: de7485ed7221f4be88aadb0aa65cb9b7bd041a77 SHA-256: f1f3b4226f21054ed47a3c7dd1d6490dd9ec636fb9edd337d3d6e2ab8aab3f21
140 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1539 Steal or Modify Data

The PDF document contains heuristics indicating it's a fake CAPTCHA and brand-impersonation credential phishing lure, specifically impersonating Apple. It directs the user to a suspicious URL, http://netcdn.tw/app/1330123889/pubg-uc-nasl-alnr-game-hack, which is likely intended to harvest credentials or session tokens. The document's structure and content suggest it's designed to trick users into performing an action that compromises their account security.

Machine Learning

  • Nyx PDF Classifier clean score 0.0098

Heuristics 7

  • 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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: http://netcdn.tw/app/1330123889/pubg-uc-nasl-alnr-game-hack.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/1330123889/pubg-uc-nasl-alnr-game-hack PDF link annotation
    • https://www.stileadda.com/uploaded_files/userfiles/files/free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.stileadda.com/uploaded_files/userfiles/files/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • https://www.stileadda.com/uploaded_files/userfiles/files/coin-master-free-spins-daily-2021_GM406889139.pdfIn PDF document text
    • https://www.stileadda.com/uploaded_files/userfiles/files/free-roblox-hacks-jailbreak_GM431946152.pdfIn PDF document text
    • https://www.stileadda.com/uploaded_files/userfiles/files/minecraft-apk-free-download-016-0_GM479516143.pdfIn PDF document text
    • https://www.stileadda.com/uploaded_files/userfiles/files/roblox-cheats-jailbreak_GM431946152.pdfIn PDF document text
    • https://www.stileadda.com/uploaded_files/userfiles/files/bux-free-robux_GM431946152.pdfIn PDF document text
    • https://www.stileadda.com/uploaded_files/userfiles/files/free-robux-rewards_GM431946152.pdfIn PDF document text
    • https://www.stileadda.com/uploaded_files/userfiles/files/i-need-robux_GM431946152.pdfIn PDF document text
    • https://www.stileadda.com/uploaded_files/userfiles/files/free-jump-hacks-for-roblox_GM431946152.pdfIn PDF document text
    • https://www.stileadda.com/uploaded_files/userfiles/files/free-coins-generator-roblox-high-school_GM431946152.pdfIn PDF document text
    • https://www.stileadda.com/uploaded_files/userfiles/files/how-to-make-a-free-minecraft-account_GM479516143.pdfIn PDF document text
    • https://www.stileadda.com/uploaded_files/userfiles/files/free-lua-7-exploit-roblox_GM431946152.pdfIn PDF document text
    • https://www.stileadda.com/uploaded_files/userfiles/files/robux-free-2021_GM431946152.pdfIn PDF document text
    • https://www.stileadda.com/uploaded_files/userfiles/files/jailbreak-roblox-hack-download_GM431946152.pdfIn PDF document text
    • https://www.stileadda.com/uploaded_files/userfiles/files/minecraft-free-online-games_GM479516143.pdfIn PDF document text
    • https://www.stileadda.com/uploaded_files/userfiles/files/download-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://www.stileadda.com/uploaded_files/userfiles/files/roblox-how-to-make-a-private-server-for-free_GM431946152.pdfIn PDF document text
    • https://www.stileadda.com/uploaded_files/userfiles/files/free-robux-games-that-actually-work-2021-links_GM431946152.pdfIn PDF document text
    • https://www.stileadda.com/uploaded_files/userfiles/files/fly-hacks-script-roblox_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_024_off00037cab.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x37CAB 25928 bytes
SHA-256: ac6115badf5ee2f685d6901b1a676a74e64cef9fdfd0aa0562d8906cb6f74670
font_01_sfnt_off0003b9c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3B9C4 18200 bytes
SHA-256: 7a6b83819dab62020909c7d8c7584246c287473f647aca29532eb253e52c52b4

Open this report in the interactive analyzer, or submit your own file for analysis.