Malicious PDF — malware analysis report

Static analysis result for SHA-256 a657190a7df194ea…

MALICIOUS

PDF

50.1 KB Created: 2021-06-10 21:52:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 17f40bbd5c4e28d4a01adcbfc9161369 SHA-1: 8e8abc7e580e54828bb5f3ffddfb97d9e4afd937 SHA-256: a657190a7df194ea94cbb8969357d1f7fbd294e4c56364cddbce82fec0005251
82 Risk Score

Malware Insights

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

The PDF document employs a common lure of 'free Robux' and 'game hacks' to entice users into clicking a link. This link, identified as 'https://netcdn.tw/app/431946152/free-robux-codes-android-game-hack', is highly suspicious and likely leads to a malicious website designed to download further malware or conduct phishing. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9789

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 https://netcdn.tw/app/431946152/free-robux-codes-android-game-hack PDF link annotation
    • https://c2o-library.net/catalog/repository/coin-master-daily-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/coin-master-free-blogspot_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/simplysarc_GM479516143.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/roblox-all-free-packages_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/coin-master-hacks-reddit_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/coin-master-spins-hack-2021_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/grab-points-login_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/minecraft-hack-client-18-9_GM479516143.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-robux-2021-no-verification_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-vip-roblox_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-robux-for-free-generator_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-coin-master-spins-blog_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-3d-roblox-gun-models_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-old-roblox-accounts_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-robux-generator-2021-no-app-download_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/minecraft-for-chromebook-free_GM479516143.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-to-play-minecraft-servers_GM479516143.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/coin-master-hack-tool-download_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/hacks-for-booga-booga-on-roblox_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005122.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5122 30484 bytes
SHA-256: e29c1d28f6cba74612df93f137f84ee0f5786fce12021ebbe4025decd3ea9689
font_01_sfnt_off00009438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9438 3928 bytes
SHA-256: 8621c8d502ef3782778d9f8a6275bb869c86817d512651ca4fd19fb1e249c467
font_02_sfnt_off0000a11d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA11D 18308 bytes
SHA-256: d860df5a04b98b5e869c5d32a338d06fd61c63e77c10c304a5ba52df0ac8221c

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