Malicious PDF — malware analysis report

Static analysis result for SHA-256 e40862dddf0bbd31…

MALICIOUS

PDF

41.6 KB Created: 2021-05-15 06:31:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 96e5cefb156879355b9635c863e80c76 SHA-1: 8629a6c45c86a6ea58263cd56a42344e99ae5160 SHA-256: e40862dddf0bbd311e99d184f40cf926d300354f4c0255b5c15fe91486082ac0
102 Risk Score

Malware Insights

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

The document contains a lure for game hacks and requests sensitive recovery secrets, indicating a phishing or credential harvesting attempt. It embeds multiple URLs pointing to potentially malicious PDF files, suggesting it acts as a dropper or redirector for further malicious content. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 4

  • 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.
  • 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/406889139/coin-master-hacks-game-hack
    • http://efeikaiwa.net/images/www-free-robux_GM431946152.pdf
    • http://efeikaiwa.net/images/coin-master-daily-free-spins-and-coins_GM406889139.pdf
    • http://efeikaiwa.net/images/play-coin-master_GM406889139.pdf
    • http://efeikaiwa.net/images/how-to-get-free-robux-instantly_GM431946152.pdf
    • http://efeikaiwa.net/images/roblox-free-items-2021_GM431946152.pdf
    • http://efeikaiwa.net/images/free-robux-without-human-verification-2021_GM431946152.pdf
    • http://efeikaiwa.net/images/free-spins-coin-master-app_GM406889139.pdf
    • http://efeikaiwa.net/images/how-to-get-free-robux-without-doing-anything_GM431946152.pdf
    • http://efeikaiwa.net/images/coin-master-free-spins-and-coins-for-iphone_GM406889139.pdf
    • http://efeikaiwa.net/images/free-robux-no-survey_GM431946152.pdf
    • http://efeikaiwa.net/images/coin-master-hack-online-download_GM406889139.pdf
    • http://efeikaiwa.net/images/how-many-levels-in-coin-master_GM406889139.pdf
    • http://efeikaiwa.net/images/daily-free-spin-link-for-coin-master_GM406889139.pdf
    • http://efeikaiwa.net/images/coin-master-spin-rewards_GM406889139.pdf
    • http://efeikaiwa.net/images/free-robux-real-working_GM431946152.pdf
    • http://efeikaiwa.net/images/games-that-give-free-robux_GM431946152.pdf
    • http://efeikaiwa.net/images/coin-master-hack-app_GM406889139.pdf
    • http://efeikaiwa.net/images/how-to-get-100-robux-for-free_GM431946152.pdf
    • http://efeikaiwa.net/images/how-to-hack-any-roblox-account_GM431946152.pdf
    • http://efeikaiwa.net/images/coin-master-hack-2021_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000046d3.bin
f0e6a996a1b2ffef1c69509f1c0d7fa29542ba2d2dbdd32320cc5b96d08dfa97		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x46D3 25840 bytes
font_01_sfnt_off000081f4.bin
c15a8689411d8cca9ab0759ab4c496fe9b4353d676dd738e300719e9588112ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81F4 17716 bytes

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