Malicious PDF — malware analysis report

Static analysis result for SHA-256 e11f84cfdf4170d2…

MALICIOUS

PDF

251.0 KB Created: 2021-07-05 02:16:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 88f36e1df0b42373fb30bb78caba73e3 SHA-1: 6e3b52913a420cf4b42f21ac45858b26e78a6f0b SHA-256: e11f84cfdf4170d28ad71d41cb282a9dd68fdbfc65269ca8f5cbaf6e18c6d2d6
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 0.0098

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-download-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-download-game-hack PDF link annotation
    • https://lib.btkljogja.or.id/repository/free-roblox-dominus_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/free-robux-unpatchable_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/roblox-account-hack-2021_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/coin-master-hack-version-33-2_GM406889139.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/free-robux-please_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/roblox-health-hack-2021_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/how-to-get-free-stuff-on-roblox_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/flip-master-coins-hack_GM406889139.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/free-coins-coin-master-daily_GM406889139.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/80-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/coin-master-free-spin-link-app_GM406889139.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/comeent-hacker-roblox_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/black-wings-roblox-free_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/music-hacker-roblox_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/how-to-know-if-im-getting-hacked-on-roblox_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/can-you-get-robux-for-free_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/free-robux-videos_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/how-to-get-roblox-premium-for-free_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/hack-of-2021-roblox_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/gamefly-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_024_off00037d89.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x37D89 26180 bytes
SHA-256: b180ddcf100843e761a7e6937c1652521d5ea03d44be93da5916f6711be3e807
font_01_sfnt_off0003bafb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3BAFB 18848 bytes
SHA-256: 5b407c04ac6a7f86aec8e94698c5056452870ced85b3a483c4cdcc801d839538

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