Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b40a20626b7fc91…

MALICIOUS

PDF

33.9 KB Created: 2021-07-05 07:07:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: f9daf9212143b67229f103e8d1e71c73 SHA-1: f72fbb331fe146ba354e893011c9c33175e6bafb SHA-256: 5b40a20626b7fc91cebc57ba3296c5b8f4bd4183f9d88719f171a56fb50cd0b4
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links and lures related to 'free Robux' and game hacks, indicating a social engineering tactic to redirect users to potentially malicious websites. The ML classifier strongly flagged this PDF as malicious, and the embedded URLs suggest a phishing or scam campaign. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are sufficient to infer a malicious intent to lead users to external, untrusted content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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 http://netcdn.tw/app/431946152/free-robux-survey-game-hack PDF link annotation
    • http://elearning-mtsn1jkt.net/__statics/gudangsoal/files/claim-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://elearning-mtsn1jkt.net/__statics/gudangsoal/files/robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://elearning-mtsn1jkt.net/__statics/gudangsoal/files/download-coin-master-apk-hack_GM406889139.pdfIn PDF document text
    • http://elearning-mtsn1jkt.net/__statics/gudangsoal/files/does-coin-master-hack-work_GM406889139.pdfIn PDF document text
    • http://elearning-mtsn1jkt.net/__statics/gudangsoal/files/coinmaster-hack_GM406889139.pdfIn PDF document text
    • http://elearning-mtsn1jkt.net/__statics/gudangsoal/files/coin-master--hack_GM406889139.pdfIn PDF document text
    • http://elearning-mtsn1jkt.net/__statics/gudangsoal/files/coin-master-daily-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://elearning-mtsn1jkt.net/__statics/gudangsoal/files/wahoogaming-co-free-robux_GM431946152.pdfIn PDF document text
    • http://elearning-mtsn1jkt.net/__statics/gudangsoal/files/free-roblox-accounts-that-work_GM431946152.pdfIn PDF document text
    • http://elearning-mtsn1jkt.net/__statics/gudangsoal/files/coin-master-free-link_GM406889139.pdfIn PDF document text
    • http://elearning-mtsn1jkt.net/__statics/gudangsoal/files/free-robux-co_GM431946152.pdfIn PDF document text
    • http://elearning-mtsn1jkt.net/__statics/gudangsoal/files/haktuts-coin-master-today_GM406889139.pdfIn PDF document text
    • http://elearning-mtsn1jkt.net/__statics/gudangsoal/files/hack-roblox-with-this-edit-cookie_GM431946152.pdfIn PDF document text
    • http://elearning-mtsn1jkt.net/__statics/gudangsoal/files/app-for-free-robux_GM431946152.pdfIn PDF document text
    • http://elearning-mtsn1jkt.net/__statics/gudangsoal/files/coin-master-games-hack_GM406889139.pdfIn PDF document text
    • http://elearning-mtsn1jkt.net/__statics/gudangsoal/files/coin-master-ultra-attack-hack_GM406889139.pdfIn PDF document text
    • http://elearning-mtsn1jkt.net/__statics/gudangsoal/files/how-to-make-a-server-in-minecraft-java-for-free_GM479516143.pdfIn PDF document text
    • http://elearning-mtsn1jkt.net/__statics/gudangsoal/files/robux-link_GM431946152.pdfIn PDF document text
    • http://elearning-mtsn1jkt.net/__statics/gudangsoal/files/freerobuxhack-us-2021_GM431946152.pdfIn PDF document text
    • http://elearning-mtsn1jkt.net/__statics/gudangsoal/files/free-spins-on-coin-master_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
font_00_sfnt_off00002dd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DD7 22332 bytes
SHA-256: 1b3ae405585a5c9bf4578ca4d953e58b6b81539944da27fff225f4392be1f304
font_01_sfnt_off00005f88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F88 19012 bytes
SHA-256: c0541a5d6200ab17734b4952abc6c0a8b533a715d99044a6ee13c1a52db76e39

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