Malicious PDF — malware analysis report

Static analysis result for SHA-256 40f314fe18bf0e65…

MALICIOUS

PDF

45.4 KB Created: 2021-05-16 08:38:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-02
MD5: f6d64bbcde89f78a75c4c35d1479cc17 SHA-1: 39117bcc50c6b40d18e00dc6813c01f0b8e67cbd SHA-256: 40f314fe18bf0e65161efeb2e6ca2d1bb2dc307a1890b2df8a9490b32fbb6323
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses a fake-CAPTCHA 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 malicious score 0.9507

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.
  • 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
  • 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/no-scam-free-robux-game-hack PDF link annotation
    • https://dirigentigiustizia.it/images/rbx-place-free-robux_GM431946152.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/coin-master-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/how-to-get-free-robux-on-iphone_GM431946152.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/coin-master-33-hack-version-download_GM406889139.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/best-free-spin-app-for-coin-master_GM406889139.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/free-robux-download_GM431946152.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/coin-master-reward-link_GM406889139.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/http-blackgamesus-coinmasterhack_GM406889139.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/free-roblox-codes_GM431946152.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/how-to-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/free-minecraft-account-and-password-generator_GM479516143.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/minecraft-java-edition-free-code_GM479516143.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/i-need-robux_GM431946152.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/apps-for-free-robux_GM431946152.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/free-spins-on-coin-master-generator_GM406889139.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/how-can-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/easy-robux-hack_GM431946152.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/easy-roblox-today_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004d08.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D08 24332 bytes
SHA-256: 65f1b58a5e9b94f7491af6705f61c4c23cd3526b4f0b3f3074ff2cea96d11ead
font_01_sfnt_off00008476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8476 2820 bytes
SHA-256: 972979c3a46100cf5f8fd289bc6fbd2496ff75fec0e3f6753648c72ec6eba714
font_02_sfnt_off00008e15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E15 18500 bytes
SHA-256: 028f53d29b1a624cb68bae5e747b7c177b5cbf8f783d4c53e2642c12f49f399d

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