Malicious PDF — malware analysis report

Static analysis result for SHA-256 33bee819c1a24ffa…

MALICIOUS

PDF

250.9 KB Created: 2021-07-06 07:58:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: a9bc53ea624ae9d7d81a11c5c252c588 SHA-1: f7e31f68fdd2b9c52c71db350090d0d7726c97b6 SHA-256: 33bee819c1a24ffa982da5b53992ec616d807b8664245ac60eddf98eb95935b9
180 Risk Score

Malware Insights

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

This PDF document was flagged as malicious. It uses brand-impersonation credential phishing, a fake-CAPTCHA lure, an MFA/2FA-themed lure and an urgency-based lure. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier clean score 0.0115

Heuristics 8

  • 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
  • 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-not-received-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-not-received-game-hack PDF link annotation
    • https://www.wetotravels.com/uploaded_files/userfiles/files/roblox-how-to-get-free-clothes_GM431946152.pdfIn PDF document text
    • https://www.wetotravels.com/uploaded_files/userfiles/files/free-robux-no-survey_GM431946152.pdfIn PDF document text
    • https://www.wetotravels.com/uploaded_files/userfiles/files/robux-gratis-hack-2021_GM431946152.pdfIn PDF document text
    • https://www.wetotravels.com/uploaded_files/userfiles/files/how-to-get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • https://www.wetotravels.com/uploaded_files/userfiles/files/roblox-coregui-hack-making_GM431946152.pdfIn PDF document text
    • https://www.wetotravels.com/uploaded_files/userfiles/files/coin-master-34-6-hack_GM406889139.pdfIn PDF document text
    • https://www.wetotravels.com/uploaded_files/userfiles/files/free-robux-and-tickets-no-survey_GM431946152.pdfIn PDF document text
    • https://www.wetotravels.com/uploaded_files/userfiles/files/minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • https://www.wetotravels.com/uploaded_files/userfiles/files/how-to-hack-someones-acount-in-roblox_GM431946152.pdfIn PDF document text
    • https://www.wetotravels.com/uploaded_files/userfiles/files/free-robux-games-that-actually-work_GM431946152.pdfIn PDF document text
    • https://www.wetotravels.com/uploaded_files/userfiles/files/get-free-coin-master-coins_GM406889139.pdfIn PDF document text
    • https://www.wetotravels.com/uploaded_files/userfiles/files/roblox-land-free-robux_GM431946152.pdfIn PDF document text
    • https://www.wetotravels.com/uploaded_files/userfiles/files/coin-master-free-spins-no-generator_GM406889139.pdfIn PDF document text
    • https://www.wetotravels.com/uploaded_files/userfiles/files/coin-master-hack-spins-2021_GM406889139.pdfIn PDF document text
    • https://www.wetotravels.com/uploaded_files/userfiles/files/how-to-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://www.wetotravels.com/uploaded_files/userfiles/files/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
    • https://www.wetotravels.com/uploaded_files/userfiles/files/coin-master-server-hack_GM406889139.pdfIn PDF document text
    • https://www.wetotravels.com/uploaded_files/userfiles/files/impact-roblox-hack-download_GM431946152.pdfIn PDF document text
    • https://www.wetotravels.com/uploaded_files/userfiles/files/site-de-hacke-roblox_GM431946152.pdfIn PDF document text
    • https://www.wetotravels.com/uploaded_files/userfiles/files/coin-master-hack-2021-app_GM406889139.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_off00037de4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x37DE4 25928 bytes
SHA-256: 761a44683eeeb4e5abecd072e22fed13ec0ccd5482bfb5721db690b8f7bfafc9
font_01_sfnt_off0003baec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3BAEC 18780 bytes
SHA-256: 2f80f7e4a5313b4e6c2d896c20fd5254fc073272ba2cf6e053299f9e1556e6b1