Malicious PDF — malware analysis report

Static analysis result for SHA-256 3df419158e230603…

MALICIOUS

PDF

41.9 KB Created: 2021-05-13 06:31:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 94f121ccbe7067e45792fd75d30748e3 SHA-1: 0fd8804090d7ea217f897577505e551040e8c671 SHA-256: 3df419158e2306039352ada9b43d045f5e47b95e1ff08d5a7fe5e656f4a52eaa
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 0.9971

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/roblox-font-free-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/roblox-font-free-game-hack PDF link annotation
    • https://www.sauvonsleclimat.org/images/get-me-free-robux_GM431946152.pdfIn PDF document text
    • https://www.sauvonsleclimat.org/images/google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.sauvonsleclimat.org/images/coin-master-daily-free-spins-link-facebook_GM406889139.pdfIn PDF document text
    • https://www.sauvonsleclimat.org/images/coin-master-hacks-that-actually-work_GM406889139.pdfIn PDF document text
    • https://www.sauvonsleclimat.org/images/coin-master-free-spins-16-04-19_GM406889139.pdfIn PDF document text
    • https://www.sauvonsleclimat.org/images/free-robux-human-verification_GM431946152.pdfIn PDF document text
    • https://www.sauvonsleclimat.org/images/coin-master-100-spin_GM406889139.pdfIn PDF document text
    • https://www.sauvonsleclimat.org/images/minecraft-114-download_GM479516143.pdfIn PDF document text
    • https://www.sauvonsleclimat.org/images/free-minecraft-bedrock_GM479516143.pdfIn PDF document text
    • https://www.sauvonsleclimat.org/images/free-bling-bling-card-coin-master_GM406889139.pdfIn PDF document text
    • https://www.sauvonsleclimat.org/images/coin-master-hack-2021-app-download_GM406889139.pdfIn PDF document text
    • https://www.sauvonsleclimat.org/images/coin-master-free-food_GM406889139.pdfIn PDF document text
    • https://www.sauvonsleclimat.org/images/coin-master-links-for-today_GM406889139.pdfIn PDF document text
    • https://www.sauvonsleclimat.org/images/coin-master-hack-version-2021-free-download_GM406889139.pdfIn PDF document text
    • https://www.sauvonsleclimat.org/images/free-robux-generator-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://www.sauvonsleclimat.org/images/coin-master-free-spin-trick_GM406889139.pdfIn PDF document text
    • https://www.sauvonsleclimat.org/images/do-you-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • https://www.sauvonsleclimat.org/images/how-do-you-earn-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.sauvonsleclimat.org/images/buy-robux-free_GM431946152.pdfIn PDF document text
    • https://www.sauvonsleclimat.org/images/can-you-still-get-minecraft-windows-10-for-free_GM479516143.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_003_off00004abf.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4ABF 24460 bytes
SHA-256: 31cd4b8cce7d72c0233835cc95d996819bd20d03b9c1c29ef77e39a8a6c42ecf
font_01_sfnt_off00008228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8228 18052 bytes
SHA-256: fc18e09b38e7f37cf7e275b91981e3530b795bdeaada945aa3ce95e8818dbc1b

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