Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa99dca20c70c9aa…

MALICIOUS

PDF

251.3 KB Created: 2021-07-05 10:58:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 4bdf1786b2af7c4ebd7b9b5f65fc278d SHA-1: 1f23aeade5db875e3efe6da81f4ca195d09851f5 SHA-256: fa99dca20c70c9aace3b63ac117dfda709d8db4e597d52a81766ec61e3c42568
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-kharidna-hai-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-kharidna-hai-game-hack PDF link annotation
    • http://pustaka.smpmuh2yk.sch.id//repository/coin-master-cheat-codes-free_GM406889139.pdfIn PDF document text
    • http://pustaka.smpmuh2yk.sch.id/repository/coin-master-card-hack-app_GM406889139.pdfIn PDF document text
    • http://pustaka.smpmuh2yk.sch.id//repository/get-more-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.smpmuh2yk.sch.id/repository/easy-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.smpmuh2yk.sch.id//repository/coin-master-hack-apk-no-survey_GM406889139.pdfIn PDF document text
    • http://pustaka.smpmuh2yk.sch.id/repository/how-to-downgrade-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://pustaka.smpmuh2yk.sch.id/repository/coin-master-free-spins-5-10-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.smpmuh2yk.sch.id//repository/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://pustaka.smpmuh2yk.sch.id//repository/coin-master-32-hack-apk-download_GM406889139.pdfIn PDF document text
    • http://pustaka.smpmuh2yk.sch.id//repository/follower-fr-tiktok-free_GM835599320.pdfIn PDF document text
    • http://pustaka.smpmuh2yk.sch.id/repository/how-to-hack-roblox-2021-june_GM431946152.pdfIn PDF document text
    • http://pustaka.smpmuh2yk.sch.id//repository/coin-master-free-coins-and-spins-link_GM406889139.pdfIn PDF document text
    • http://pustaka.smpmuh2yk.sch.id/repository/pubg-uc-code-redeem_GM1330123889.pdfIn PDF document text
    • http://pustaka.smpmuh2yk.sch.id/repository/free-roblox-clothes_GM431946152.pdfIn PDF document text
    • http://pustaka.smpmuh2yk.sch.id//repository/hack-coin-master-ios_GM406889139.pdfIn PDF document text
    • http://pustaka.smpmuh2yk.sch.id/repository/coin-master-fan-page-facebook_GM406889139.pdfIn PDF document text
    • http://pustaka.smpmuh2yk.sch.id//repository/free-robux-for-kids-no-verification_GM431946152.pdfIn PDF document text
    • http://pustaka.smpmuh2yk.sch.id/repository/coin-master-hack-mod_GM406889139.pdfIn PDF document text
    • http://pustaka.smpmuh2yk.sch.id/repository/coin-master-free-spins-and-coins-hack_GM406889139.pdfIn PDF document text
    • http://pustaka.smpmuh2yk.sch.id/repository/how-to-get-cheap-pubg-uc_GM1330123889.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_off00037ff0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x37FF0 26044 bytes
SHA-256: 45f1c3836e58271c691004f133833ae9d18a57e86abc25bcf83b9e25fa276a93
font_01_sfnt_off0003bd67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3BD67 18588 bytes
SHA-256: 56d4e28b48348d034785efe89062a05729fdc0b73e83c3f68b54dec50aae8df2

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