Malicious PDF — malware analysis report

Static analysis result for SHA-256 56af67635ac5f82e…

MALICIOUS

PDF

250.4 KB Created: 2021-07-06 06:10:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: b0438382701dde9465a6a830c61f80f6 SHA-1: c938dd90c8a0a33aa406d4ec187e4aceb313c1ca SHA-256: 56af67635ac5f82ebbbfc3404d335d740ab6d7b72fd016df3709f1c5ce119edb
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-free-in-pakistan-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-free-in-pakistan-game-hack PDF link annotation
    • http://library-fkip.uho.ac.id/repository/roblox-its-free-2021_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/roblox-how-to-cheat-on-tycoon-games_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/free-roblox-accounts-2021-with-robux-october_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/free-robux-2021-generator_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/roblox-rifle-script-hack_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/minecraft-world-free-download_GM479516143.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/free-minecraft-accounts-2021_GM479516143.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/how-to-get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/free-minecraft-alt-accounts_GM479516143.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/free-robux-today_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/free-robux-no-verification-2021-android_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/mm2-roblox-cheat-codes_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/coin-master-free-spins-hack-apk-download_GM406889139.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/codes-for-free-stuff-ib-roblox_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/roblox-pink-free-robux_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/how-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/btools-hack-roblox-jailbreak-2021_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/zombie-attack-roblox-hack_GM431946152.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/coin-master-coins-free_GM406889139.pdfIn PDF document text
    • http://library-fkip.uho.ac.id/repository/free-spin-coin-master-link-2021_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_off00037c73.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x37C73 25928 bytes
SHA-256: 4a72051c65fb47dfae88b9b9b5517b1bc8e614a25c69178664db0ecc9a15a7f5
font_01_sfnt_off0003b998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3B998 18684 bytes
SHA-256: 661a3efe8ef7c4161472b149172a493c56d0ba37d0af510361ea653a0c67e54d

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