Malicious PDF — malware analysis report

Static analysis result for SHA-256 f308c3a53443ce42…

MALICIOUS

PDF

250.5 KB Created: 2021-07-05 11:11:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: bbc4d8a211bddaf5c171554f8a31335d SHA-1: 549bf233d7734e4ab1f7bc6c515accdf499ae161 SHA-256: f308c3a53443ce42bd22bdcdb2a22bb5d7ec7a0791c4e051a6486f8dc956a626
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1534 Credentials In Application

The PDF document contains a link to 'http://netcdn.tw/app/1330123889/pubg-uc-kaise-khariden-game-hack', which is presented as a game hack generator. Heuristics indicate this is a lure for credential phishing, potentially abusing MFA, and impersonates the brand 'Apple' while using a non-matching host. The document also displays a fake CAPTCHA to trick the user into interacting with the malicious link.

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-kaise-khariden-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-kaise-khariden-game-hack PDF link annotation
    • http://elibrary.perludem.org/repository/roblox-gift-card-free-codes_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/coin-master-free-spin-2912-2021_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-robux-codes_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/roblox-make-a-cake-hack_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-roblox-birthday-printable_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/how-to-get-free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/roblox-how-to-hack-a-perso_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/free-robux-every-day_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/how-to-get-roebucks-in-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/hacks-for-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/roblox-free-trial_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/roblox-hack-deutsch-pc_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/pubg-uc-free-online_GM1330123889.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/earn-robux-for-roblox_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/robux-hack-apk-2021_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-robux-now-2021_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/coin-master-gifts_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/roblox-free-models_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/robux-no-survey_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_off00037cb7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x37CB7 26180 bytes
SHA-256: c4fa40f4352898105d2317f2168d9a0baa8d848058cc06f844c992adc13f42d7
font_01_sfnt_off0003ba27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3BA27 18588 bytes
SHA-256: 253e70fac1043e7962e1e3dcb768948a6c9d77652a901a7819255c99f4215ef8

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