Malicious PDF — malware analysis report

Static analysis result for SHA-256 e666cc1cce58e13d…

MALICIOUS

PDF

42.6 KB Created: 2021-05-14 03:46:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: aafbcc1cf175f4b31a632cd8630efe73 SHA-1: 4f0a55ac11f28d6b71bb811c7d622d0ef3ef0ed0 SHA-256: e666cc1cce58e13dc0b0bf80fe202575dac62255e300911104f8cc9076efcc48
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 0.9971

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.xyz/app/406889139/free-spin-app-for-coin-master-game-hack PDF link annotation
    • http://kermas.eu/images/free-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • http://kermas.eu/images/free-robux-2021_GM431946152.pdfIn PDF document text
    • http://kermas.eu/images/coin-master-hack-reddit_GM406889139.pdfIn PDF document text
    • http://kermas.eu/images/how-do-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://kermas.eu/images/robux-com-free-robux_GM431946152.pdfIn PDF document text
    • http://kermas.eu/images/minecraft-java-account-free_GM479516143.pdfIn PDF document text
    • http://kermas.eu/images/master-coin-free_GM406889139.pdfIn PDF document text
    • http://kermas.eu/images/coin-master-32-hack-apk-download_GM406889139.pdfIn PDF document text
    • http://kermas.eu/images/free-robux-without-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://kermas.eu/images/easy-robux-generator_GM431946152.pdfIn PDF document text
    • http://kermas.eu/images/roblox-girl_GM431946152.pdfIn PDF document text
    • http://kermas.eu/images/master-free-spin_GM406889139.pdfIn PDF document text
    • http://kermas.eu/images/coin-master-free-spin-daily-link_GM406889139.pdfIn PDF document text
    • http://kermas.eu/images/best-free-minecraft-servers_GM479516143.pdfIn PDF document text
    • http://kermas.eu/images/how-to-get-free-robux-on-android_GM431946152.pdfIn PDF document text
    • http://kermas.eu/images/wurst-hacked-client-112-2_GM479516143.pdfIn PDF document text
    • http://kermas.eu/images/how-to-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
    • http://kermas.eu/images/coin-master-free-spin-link-twitter_GM406889139.pdfIn PDF document text
    • http://kermas.eu/images/coin-master-update-2021_GM406889139.pdfIn PDF document text
    • http://kermas.eu/images/how-to-get-free-robux-no-human-verification-2021_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
font_00_sfnt_off00004c19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4C19 24996 bytes
SHA-256: d2af34dd8872758ba397e6814015a0c348cdbf65db04c159b3c491753a43e6bd
font_01_sfnt_off0000854d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x854D 17884 bytes
SHA-256: 64e302a077f8ec1bb79f530eb8d45af8bfabe23c67be24f596f79d031454c781

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