Malicious PDF — malware analysis report

Static analysis result for SHA-256 328fb2c0b499f616…

MALICIOUS

PDF

43.3 KB Created: 2021-06-03 22:05:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-02
MD5: dc108e1e112f8fb66f42ba2251cc4a62 SHA-1: 144217277d0bf6a41ed239dd0ea48190e33f5bc8 SHA-256: 328fb2c0b499f616897d80241b80557676404b4be02b2fc0eb99c80aee855020
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by an ML classifier. It uses a seed-phrase/secret-recovery 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 0.9865

Heuristics 5

  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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.
  • 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.online/app/406889139/free-role-in-coin-master-game-hack PDF link annotation
    • http://www.js100.com/uploads/ckeditor/files/free-robux-hack_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-free-coins-and-spins-hack_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/blox-fish-free-robux_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/how-to-get-free-robux-no-scam_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-roblox-accessories_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-robux-gift-card-codes_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/but-link-says-free-robux_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-robux-com-roblox_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-daily-free-spins-link_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/minecraft-java-edition-free-trial_GM479516143.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/how-to-hack-a-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-spins-coin-master-2021-no-verification_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-daily-spin-link_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-likes-for-tiktok_GM835599320.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/roblox-exploit-scripts_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/lazyblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/minecraft-java-free-trial_GM479516143.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-robux-rewards_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-free-snacks-link_GM406889139.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_004_off00005061.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5061 24536 bytes
SHA-256: 347acfc72d948f21486bf40350ae1a03e0706825e9c4db99b20691e0957f7c83
font_01_sfnt_off00008802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8802 17784 bytes
SHA-256: 0d7a398330f0569861c9be6bc79ebc6a034914cc65f21f48a02d0c09e8a404e1

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