Malicious PDF — malware analysis report

Static analysis result for SHA-256 0874befe39767ea6…

MALICIOUS

PDF

251.2 KB Created: 2021-07-05 22:14:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a5846e4bdad1e05909f6a360f529c456 SHA-1: 4e1336f44d5087be89228e183219bfc9f51ed8bc SHA-256: 0874befe39767ea6b1ec408c600d46fdb4574c68bf31beb85139e70f3e37269d
140 Risk Score

Malware Insights

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

The sample is a PDF that impersonates Apple and uses a fake CAPTCHA lure to trick the user into clicking a malicious link. The embedded URL, http://netcdn.tw/app/1330123889/pubg-uc-unipin-game-hack, is presented as a call-to-action, likely leading to credential harvesting or MFA abuse. No scripts were extracted, but the PDF structure and heuristics strongly suggest a phishing attempt.

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-unipin-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-unipin-game-hack PDF link annotation
    • http://library.yamasi.ac.id/repository/all-free-emotes-in-roblox_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/thomas-and-friends-roblox-free-games_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/coin-master-free-spins--coins-2021_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/25-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/discord-free-robux-bot_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/coin-master-free-2021-spin-link-today_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/minecraft-free-download-mac-full-version_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/how-to-get-free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/are-there-any-coin-master-hacks-that-actually-work_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/pokemon-go-free-coins_GM1094591345.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/coin-master-hack-xyz_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-robux-ad_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/blaze-games-co-free-robux_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/coin-master-links-for-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/www-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/online-coin-master-hack-here_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/como-recuperar-tu-cuenta-de-roblox-hackeada_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/robuxian-tutorials-free-robux-code-generator_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/coin-master-free-spins-link-facebook_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/robux-no-human-verification_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_off0003800a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3800A 26028 bytes
SHA-256: 95a24e81972dfa473c39bb7eb8a969ec33c978c6cd249c714571b76c69bae9bf
font_01_sfnt_off0003bd45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3BD45 18420 bytes
SHA-256: b1773b1ec5e0379df98435fc301e6774359df9783be22b9c532bc5d7274114fb

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