Malicious PDF — malware analysis report

Static analysis result for SHA-256 31c9c7a781a80fb1…

MALICIOUS

PDF

45.3 KB Created: 2021-06-02 14:03:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 5fd55e8b874faae27bc8de20d379b6be SHA-1: 1be5ad70e933ec0ee911e27540d94d02717e4fbc SHA-256: 31c9c7a781a80fb19cbc29864aa3d0a46fd20aef49de198a07e5e070383c8795
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 0.9864

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.xyz/app/431946152/downlode-a-roblox-hack-tool-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.xyz/app/431946152/downlode-a-roblox-hack-tool-game-hack PDF link annotation
    • http://io24.com.ar/images/minecraft-pe-free-apk_GM479516143.pdfIn PDF document text
    • http://io24.com.ar/images/how-to-get-free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://io24.com.ar/images/how-to-get-free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • http://io24.com.ar/images/is-roblox-studio-free_GM431946152.pdfIn PDF document text
    • http://io24.com.ar/images/coin-master-daily-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://io24.com.ar/images/free-spin-coin-master-today_GM406889139.pdfIn PDF document text
    • http://io24.com.ar/images/free-roblox-hack_GM431946152.pdfIn PDF document text
    • http://io24.com.ar/images/free-t-shirt-roblox_GM431946152.pdfIn PDF document text
    • http://io24.com.ar/images/coin-master-free-spins-link-2021-no-verification_GM406889139.pdfIn PDF document text
    • http://io24.com.ar/images/how-to-hack-coin-master-using-es-filer_GM406889139.pdfIn PDF document text
    • http://io24.com.ar/images/coin-master-free-generator_GM406889139.pdfIn PDF document text
    • http://io24.com.ar/images/roblox-apocalypse-rising-hack_GM431946152.pdfIn PDF document text
    • http://io24.com.ar/images/hack-minecraft_GM479516143.pdfIn PDF document text
    • http://io24.com.ar/images/coin-master-hack-spins-free_GM406889139.pdfIn PDF document text
    • http://io24.com.ar/images/roblox-skin-free_GM431946152.pdfIn PDF document text
    • http://io24.com.ar/images/minecraft-login-free_GM479516143.pdfIn PDF document text
    • http://io24.com.ar/images/coin-master-hack-version-download-2021_GM406889139.pdfIn PDF document text
    • http://io24.com.ar/images/coin-master-daily-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • http://io24.com.ar/images/coin-master-free-coins-facebook_GM406889139.pdfIn PDF document text
    • http://io24.com.ar/images/how-to-get-free-robux-without-paying_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_off00004fe4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FE4 27120 bytes
SHA-256: 14b278f661b6168a345d25670e5ca6dbc65176607c2664a89bd469ae191c2684
font_01_sfnt_off00008d1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D1B 18688 bytes
SHA-256: fec9d5d34d80894412292409aa32597b6d2804c18fe417852380aa4a5c89f82f

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