Malicious PDF — malware analysis report

Static analysis result for SHA-256 5464f73edf7cdb6c…

MALICIOUS

PDF

42.8 KB Created: 2021-05-16 18:50:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 89c185911c1a8f0a1e0a1432b0964a88 SHA-1: eae72821e84966b9141664957df910e68b5f74eb SHA-256: 5464f73edf7cdb6cf3e364ad617a7e7ada24bd2c677b9cf21ac9b50638c55007
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/406889139/free-spins-promo-code-for-coin-master-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/406889139/free-spins-promo-code-for-coin-master-game-hack PDF link annotation
    • http://autoskola-scp.com/files/how-to-get-free-skins-in-minecraft_GM479516143.pdfIn PDF document text
    • http://autoskola-scp.com/files/google-how-do-you-get-robux_GM431946152.pdfIn PDF document text
    • http://autoskola-scp.com/files/tiradas-coin-master_GM406889139.pdfIn PDF document text
    • http://autoskola-scp.com/files/free-100-robux_GM431946152.pdfIn PDF document text
    • http://autoskola-scp.com/files/free-robux-discord-servers_GM431946152.pdfIn PDF document text
    • http://autoskola-scp.com/files/free-robux-no-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://autoskola-scp.com/files/roblox-tracker_GM431946152.pdfIn PDF document text
    • http://autoskola-scp.com/files/google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://autoskola-scp.com/files/free-spin-coin-master-apk_GM406889139.pdfIn PDF document text
    • http://autoskola-scp.com/files/free-spin-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://autoskola-scp.com/files/robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • http://autoskola-scp.com/files/free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://autoskola-scp.com/files/roblox-gift-card-online-free_GM431946152.pdfIn PDF document text
    • http://autoskola-scp.com/files/master-coin-hack-mod_GM406889139.pdfIn PDF document text
    • http://autoskola-scp.com/files/what-is-robux-in-roblox_GM431946152.pdfIn PDF document text
    • http://autoskola-scp.com/files/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://autoskola-scp.com/files/free-roblox-accounts-with-robux-that-work-not-banned_GM431946152.pdfIn PDF document text
    • http://autoskola-scp.com/files/coin-master-daily-bonus_GM406889139.pdfIn PDF document text
    • http://autoskola-scp.com/files/roblox-pink-free-robux_GM431946152.pdfIn PDF document text
    • http://autoskola-scp.com/files/how-do-you-get-free-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_003_off00004c58.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C58 24924 bytes
SHA-256: 4d448d54f27cc56464157504c7c98915870c0044c5330fa47142c5eb7a500706
font_01_sfnt_off00008469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8469 18476 bytes
SHA-256: 012804114e8e9e2aa3b79000d66a92024558acae5133cb67a1122bc204fa5aec

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