Malicious PDF — malware analysis report

Static analysis result for SHA-256 821c9da7665f36ab…

MALICIOUS

PDF

45.3 KB Created: 2021-06-07 22:14:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: cb2af2ece1c01710811144313c48b431 SHA-1: 48687277e13c2434b1cad9cfa7038de358ba1e1f SHA-256: 821c9da7665f36ab104201b23f6c27691176b02516db6bc0c70445e158177aa4
142 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 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 0.9864

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.tw/app/431946152/free-groups-on-roblox-to-own-game-hack PDF link annotation
    • http://schottlandfieber.de/images/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://schottlandfieber.de/images/free-robux-real-2021_GM431946152.pdfIn PDF document text
    • http://schottlandfieber.de/images/free-robux-no-human-verification-generator_GM431946152.pdfIn PDF document text
    • http://schottlandfieber.de/images/how-to-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://schottlandfieber.de/images/how-to-get-free-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://schottlandfieber.de/images/free-robux-app-real_GM431946152.pdfIn PDF document text
    • http://schottlandfieber.de/images/free-minecraft-games-for-kids_GM479516143.pdfIn PDF document text
    • http://schottlandfieber.de/images/how-to-download-minecraft-for-free-on-iphone_GM479516143.pdfIn PDF document text
    • http://schottlandfieber.de/images/roblox-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://schottlandfieber.de/images/free-coin-master-game_GM406889139.pdfIn PDF document text
    • http://schottlandfieber.de/images/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://schottlandfieber.de/images/free-robuxs-ahack_GM431946152.pdfIn PDF document text
    • http://schottlandfieber.de/images/roblox-sex-cheat_GM431946152.pdfIn PDF document text
    • http://schottlandfieber.de/images/blox-world-free-robux_GM431946152.pdfIn PDF document text
    • http://schottlandfieber.de/images/hack-tiktok-fans-free_GM835599320.pdfIn PDF document text
    • http://schottlandfieber.de/images/gaming-dunia-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://schottlandfieber.de/images/free-spin-online-tool-coin-master_GM406889139.pdfIn PDF document text
    • http://schottlandfieber.de/images/coin-master-levels_GM406889139.pdfIn PDF document text
    • http://schottlandfieber.de/images/will-minecraft-dungeons-be-free_GM479516143.pdfIn PDF document text
    • http://schottlandfieber.de/images/but-link-says-free-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 7

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004ff4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FF4 26884 bytes
SHA-256: 681a2fd85b440d8e8172f82ecb1da1a4e6ef7f5940770bfc98c966b90bdc8c3b
font_01_sfnt_off00008e0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E0F 18428 bytes
SHA-256: c768d4894c22b70b4bfe0c426d43fc779fe3057361cc8226b8af86007902d612

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