Malicious PDF — malware analysis report

Static analysis result for SHA-256 03f2e56d75310fe7…

MALICIOUS

PDF

44.2 KB Created: 2021-06-10 18:42:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: e3dd60db1646e3ac996d24e528784845 SHA-1: 258062f538888d57f69f1f99bcdb20b825a93a5a SHA-256: 03f2e56d75310fe7f1eb2215860cce534fe5799a7ffab6392e3176d642fdbaa6
122 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. It uses brand-impersonation credential phishing. 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 malicious score 0.9865

Heuristics 5

  • 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.
  • 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: https://netcdn.tw/app/431946152/how-to-get-free-robux-on-roblox-mobile-2021-game-hack.
  • 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-get-free-robux-on-roblox-mobile-2021-game-hack PDF link annotation
    • http://www.marambio.com.ar/images/how-to-install-minecraft-for-free-on-ios_GM479516143.pdfIn PDF document text
    • http://www.marambio.com.ar/images/how-to-get-free-robux-on-ipad_GM431946152.pdfIn PDF document text
    • http://www.marambio.com.ar/images/best-free-minecraft-servers_GM479516143.pdfIn PDF document text
    • http://www.marambio.com.ar/images/free-robux-accounts_GM431946152.pdfIn PDF document text
    • http://www.marambio.com.ar/images/appsmob-info-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.marambio.com.ar/images/minecraft-115-2-hacks_GM479516143.pdfIn PDF document text
    • http://www.marambio.com.ar/images/android-oyun-club-roblox-robux-hack_GM431946152.pdfIn PDF document text
    • http://www.marambio.com.ar/images/free-onlne-roblox_GM431946152.pdfIn PDF document text
    • http://www.marambio.com.ar/images/coin-master-hack-apk_GM406889139.pdfIn PDF document text
    • http://www.marambio.com.ar/images/how-to-get-free-robux-hack-no-survey_GM431946152.pdfIn PDF document text
    • http://www.marambio.com.ar/images/free-robux-link_GM431946152.pdfIn PDF document text
    • http://www.marambio.com.ar/images/comment-avoir-des-robux-free_GM431946152.pdfIn PDF document text
    • http://www.marambio.com.ar/images/nuevo-hack-de-robux_GM431946152.pdfIn PDF document text
    • http://www.marambio.com.ar/images/free-tiktok-views-no-verification_GM835599320.pdfIn PDF document text
    • http://www.marambio.com.ar/images/http-blackgamesus-coinmasterhack_GM406889139.pdfIn PDF document text
    • http://www.marambio.com.ar/images/coin-master-free-spins-may-11-2021_GM406889139.pdfIn PDF document text
    • http://www.marambio.com.ar/images/how-can-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.marambio.com.ar/images/free-tiktok-followers-no-downloads_GM835599320.pdfIn PDF document text
    • http://www.marambio.com.ar/images/free-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://www.marambio.com.ar/images/free-robux-games-that-actually-work_GM431946152.pdfIn PDF document text
    • https://krnl.rocksIn 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_off00004e93.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E93 25152 bytes
SHA-256: ea8f010f2c32b863e929013f977ca1b74dc05a4d799f4192ee9813e027aee4e4
font_01_sfnt_off000087a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87A2 19072 bytes
SHA-256: f0b25f136ebb2895d844edb46d9a5ac8aedc6bce8d2e9e7d8a5d19ba5244cab3

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