Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d5d4cbd50716c73…

MALICIOUS

PDF

42.6 KB Created: 2021-05-12 00:12:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: e98315fbaa82a3fe5e3346f6ac7a1185 SHA-1: aa2b9472f69b6887b2bbc3e151686bcecd6d59bb SHA-256: 2d5d4cbd50716c73a1142991cd7dca86d7c76995224fe60c0e74e113340b33ac
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/op-rewards-free-robux-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/op-rewards-free-robux-game-hack PDF link annotation
    • http://educhina.mn/editor/files/free-coin-master-gift-link_GM406889139.pdfIn PDF document text
    • http://educhina.mn/editor/files/coin-master-free-cards_GM406889139.pdfIn PDF document text
    • http://educhina.mn/editor/files/coin-master-hack-android_GM406889139.pdfIn PDF document text
    • http://educhina.mn/editor/files/coin-master-cards-for-free_GM406889139.pdfIn PDF document text
    • http://educhina.mn/editor/files/free-coin-master-spins-without-human-verification_GM406889139.pdfIn PDF document text
    • http://educhina.mn/editor/files/free-online-minecraft-server_GM479516143.pdfIn PDF document text
    • http://educhina.mn/editor/files/coin-master-hack-pro-gamers_GM406889139.pdfIn PDF document text
    • http://educhina.mn/editor/files/free-minecraft-thumbnails_GM479516143.pdfIn PDF document text
    • http://educhina.mn/editor/files/how-to-get-free-robux-without-email_GM431946152.pdfIn PDF document text
    • http://educhina.mn/editor/files/corn-master_GM406889139.pdfIn PDF document text
    • http://educhina.mn/editor/files/free-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://educhina.mn/editor/files/coin-master-hack-mod-apk-free-download_GM406889139.pdfIn PDF document text
    • http://educhina.mn/editor/files/coin-master-50-spin-link_GM406889139.pdfIn PDF document text
    • http://educhina.mn/editor/files/earn-points-for-robux_GM431946152.pdfIn PDF document text
    • http://educhina.mn/editor/files/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://educhina.mn/editor/files/free-coin-master-hacks_GM406889139.pdfIn PDF document text
    • http://educhina.mn/editor/files/minecraft-world-free-download_GM479516143.pdfIn PDF document text
    • http://educhina.mn/editor/files/coin-master-free-spinv1-0apkpure-com-apk_GM406889139.pdfIn PDF document text
    • http://educhina.mn/editor/files/coin-master-free-spins-today-new_GM406889139.pdfIn PDF document text
    • http://educhina.mn/editor/files/roblox-hack-game_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_off000048a5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48A5 25332 bytes
SHA-256: 3b34db88dd4d548a8c35b5241a80ee1b6ba33c72123957bb3d21e1c58c4e30a8
font_01_sfnt_off00008271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8271 18756 bytes
SHA-256: 060429e30aee9ae32e68a5a96a6a224aa27ea33c727993be362f9dfde6d66d3f

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