Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d72d20c864644aa…

MALICIOUS

PDF

48.1 KB Created: 2021-06-09 04:42:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 2214fc68d37204e356483e331593277e SHA-1: 5a1dd0b0d16730d10338f85cb35fd88158a7f3e1 SHA-256: 7d72d20c864644aa66b01f710ed88c589689535e4cfa9ba062bb6c3d185aeb96
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document employs a fake CAPTCHA lure to trick users into interacting with a link, specifically advertising 'game hacks' or 'free generators'. The primary malicious URL identified is https://netcdn.tw/app/431946152/how-to-hack-roblox-accounts-on-phone-2021-game-hack. While no scripts were extracted, the document's structure and heuristics suggest it's designed to lead the user to a potentially malicious website, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

Heuristics 6

  • 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
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 https://netcdn.tw/app/431946152/how-to-hack-roblox-accounts-on-phone-2021-game-hack PDF link annotation
    • http://italymania.ru/images/free-spin-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://italymania.ru/images/robux-gift-card-free_GM431946152.pdfIn PDF document text
    • http://italymania.ru/images/free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://italymania.ru/images/promo-code-free-robux_GM431946152.pdfIn PDF document text
    • http://italymania.ru/images/how-to-get-free-robux-youtube_GM431946152.pdfIn PDF document text
    • http://italymania.ru/images/www-free-robux_GM431946152.pdfIn PDF document text
    • http://italymania.ru/images/how-to-get-free-hats-on-roblox_GM431946152.pdfIn PDF document text
    • http://italymania.ru/images/coin-master-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • http://italymania.ru/images/rape-simulator_GM431946152.pdfIn PDF document text
    • http://italymania.ru/images/free-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://italymania.ru/images/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://italymania.ru/images/pubg-70-uc_GM1330123889.pdfIn PDF document text
    • http://italymania.ru/images/get-me-free-robux_GM431946152.pdfIn PDF document text
    • http://italymania.ru/images/robux-free-2021_GM431946152.pdfIn PDF document text
    • http://italymania.ru/images/coin-master-free-spin-ml_GM406889139.pdfIn PDF document text
    • http://italymania.ru/images/coin-master-hack-without-verification-code_GM406889139.pdfIn PDF document text
    • http://italymania.ru/images/coin-master-free-in-app-purchases_GM406889139.pdfIn PDF document text
    • http://italymania.ru/images/i-robux_GM431946152.pdfIn PDF document text
    • http://italymania.ru/images/daily-free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://italymania.ru/images/free-kak-roblox_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_004_off00005217.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5217 29832 bytes
SHA-256: eca50972e627a77fb33af559ee65ec391b5201dd0d003ad46ea59eadf2abe11d
font_01_sfnt_off00009659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9659 19312 bytes
SHA-256: ee3ccdf346fecf17211ec9caf874d857695d657b5f92e2b1f0fe00576c016ffb

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