Malicious PDF — malware analysis report

Static analysis result for SHA-256 b73c10d6ed9f3e14…

MALICIOUS

PDF

43.9 KB Created: 2021-05-12 03:09:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: f6f23b9ab5cfed960234bc85cb054ea2 SHA-1: 10e9479db4179743a34f566404f156554b5df7df SHA-256: b73c10d6ed9f3e14837e393f8fb1637acf4bb63b5b95cc538d5c4ee8870ef433
122 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 brand-impersonation credential phishing. 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 0.9959

Heuristics 5

  • 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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.xyz/app/431946152/free-robux-no-human-verification-no-survey-game-hack.
  • 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/431946152/free-robux-no-human-verification-no-survey-game-hack PDF link annotation
    • http://viemeo.fr/images/hacks-for-minecraft-bedrock_GM479516143.pdfIn PDF document text
    • http://viemeo.fr/images/how-to-get-free-robux-website_GM431946152.pdfIn PDF document text
    • http://viemeo.fr/images/free-coin-coin-master_GM406889139.pdfIn PDF document text
    • http://viemeo.fr/images/how-to-make-my-own-coin-master-cards-hack_GM406889139.pdfIn PDF document text
    • http://viemeo.fr/images/cm-spin-link_GM406889139.pdfIn PDF document text
    • http://viemeo.fr/images/free-minecraft-windows-10-with-java_GM479516143.pdfIn PDF document text
    • http://viemeo.fr/images/moon-static-coin-master-generator-hacks-free_GM406889139.pdfIn PDF document text
    • http://viemeo.fr/images/free-robux-codes-no-human-verification_GM431946152.pdfIn PDF document text
    • http://viemeo.fr/images/how-to-get-free-robux-youtube_GM431946152.pdfIn PDF document text
    • http://viemeo.fr/images/hack-coin-master-download_GM406889139.pdfIn PDF document text
    • http://viemeo.fr/images/free-roblox-accessories_GM431946152.pdfIn PDF document text
    • http://viemeo.fr/images/a-lot-of-robux_GM431946152.pdfIn PDF document text
    • http://viemeo.fr/images/how-do-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://viemeo.fr/images/minecraft-java-edition-for-free_GM479516143.pdfIn PDF document text
    • http://viemeo.fr/images/free-spins-coin-master-legit_GM406889139.pdfIn PDF document text
    • http://viemeo.fr/images/free-minecraft-hosting_GM479516143.pdfIn PDF document text
    • http://viemeo.fr/images/free-roblox-hair-boy_GM431946152.pdfIn PDF document text
    • http://viemeo.fr/images/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • http://viemeo.fr/images/how-to-get-free-robux-easy-2021_GM431946152.pdfIn PDF document text
    • http://viemeo.fr/images/coin-master-free-daily-spins-and-coins_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_003_off00004886.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4886 26428 bytes
SHA-256: 45ff3b22bdb7ff6f25c3715bb71ffd43a4f731d3c2641ad9340134bd790eeff4
font_01_sfnt_off00008503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8503 19684 bytes
SHA-256: 67ac6bc1bdfed878560b6b6b7782d345c4f264005f18e63a56c12f3ace5489ed

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