Malicious PDF — malware analysis report

Static analysis result for SHA-256 837b2ccc90c1c032…

MALICIOUS

PDF

251.1 KB Created: 2021-07-08 07:51:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 395d94456ae489a6ae518eb67f4f5177 SHA-1: c14a5007caa072d63acc4af8202580e735d4985a SHA-256: 837b2ccc90c1c03265f8aa5db74362e1d04359e114e9f175e2c2ad52f6f00f3c
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-u-mobile-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-u-mobile-game-hack PDF link annotation
    • http://www.digilib.uim.ac.id/repository/free-robux-codes-2021-october_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/cheat-engube-55-roblox_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/how-to-get-free-robux-website_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/get-me-robux-for-free_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/coin-master-hack-spins-free_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/coin-master-free-spins-link-blogspot-today_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/minecraft-windows-10-hack-client-2021_GM479516143.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/coin-master-pc-game-free-download_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-robux-obby-2021_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/minecraft-hacks-xbox_GM479516143.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/coin-master-gold-cards-free_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/coin-master-homepage_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/minecraft-pocket-edition-free-download_GM479516143.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/coin-master-club-hack_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/how-to-get-free-robux-on-pc_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/how-to-hack-a-minecraft-server-and-make-yourself-op_GM479516143.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/tiktok-free-open_GM835599320.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-robux-with-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_off00037ece.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x37ECE 26180 bytes
SHA-256: 2127bcea2c398205d6d8c00f2b858352eadc8f2c04c6392d54e4d95fd264ca98
font_01_sfnt_off0003bc34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3BC34 18656 bytes
SHA-256: 66207def77b31ef93b3f9b965bb8f480a55936bb4551013a7dd4b0e93ae85498

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