Malicious PDF — malware analysis report

Static analysis result for SHA-256 91e4e2a716b3cd78…

MALICIOUS

PDF

44.1 KB Created: 2021-05-13 10:31:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 15f7a95bad3e57683874a78cd917bf0b SHA-1: 92756e5749e2b0addb2d9b82ddb90c9a15030c3f SHA-256: 91e4e2a716b3cd78b249a69e6e3837173642cd1c8ad583fa2415365bf90a8889
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 0.9976

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/free-robux-generator-no-human-verification-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.xyz/app/431946152/free-robux-generator-no-human-verification-2021-game-hack PDF link annotation
    • http://loriginedupain.org/images/coin-master-hack-apk-33-download_GM406889139.pdfIn PDF document text
    • http://loriginedupain.org/images/roblox36com-free-robux_GM431946152.pdfIn PDF document text
    • http://loriginedupain.org/images/roblox-arsenal-hack_GM431946152.pdfIn PDF document text
    • http://loriginedupain.org/images/how-to-get-free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://loriginedupain.org/images/hacks-for-minecraft-bedrock_GM479516143.pdfIn PDF document text
    • http://loriginedupain.org/images/juego-hackeado-de-coin-master_GM406889139.pdfIn PDF document text
    • http://loriginedupain.org/images/free-coin-master-gift-link_GM406889139.pdfIn PDF document text
    • http://loriginedupain.org/images/roblox-land-free-robux_GM431946152.pdfIn PDF document text
    • http://loriginedupain.org/images/robux-gratis_GM431946152.pdfIn PDF document text
    • http://loriginedupain.org/images/download-coin-master-hack-mod-apk_GM406889139.pdfIn PDF document text
    • http://loriginedupain.org/images/free-robux-without-verify_GM431946152.pdfIn PDF document text
    • http://loriginedupain.org/images/generator-robux_GM431946152.pdfIn PDF document text
    • http://loriginedupain.org/images/minecraft-app-store-free_GM479516143.pdfIn PDF document text
    • http://loriginedupain.org/images/coin-master-fan-hack_GM406889139.pdfIn PDF document text
    • http://loriginedupain.org/images/open-coin-master_GM406889139.pdfIn PDF document text
    • http://loriginedupain.org/images/coin-master-free-spins-hacktman_GM406889139.pdfIn PDF document text
    • http://loriginedupain.org/images/master-game_GM406889139.pdfIn PDF document text
    • http://loriginedupain.org/images/today-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • http://loriginedupain.org/images/coin-master-free-spins-and-coins-blogspot_GM406889139.pdfIn PDF document text
    • http://loriginedupain.org/images/free-robux-that-actually-works_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_off00004a58.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A58 25952 bytes
SHA-256: c827db874742417f29fd988c8fbc848bc572aa3a61994740c0747e6e3199fe05
font_01_sfnt_off00008724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8724 19260 bytes
SHA-256: cfeb00e99c7da41c79bd6814c2de1bf58f441159bdfe452787b9448ffd27beb4

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