Malicious PDF — malware analysis report

Static analysis result for SHA-256 78bd6b61992597e2…

MALICIOUS

PDF

47.6 KB Created: 2021-05-19 11:46:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 0c2c074bafb3ee680ec0811bedecb154 SHA-1: 76222c1edff38f15782b6db9b3268086e1632917 SHA-256: 78bd6b61992597e2d05de454e76c87907738d880b5a015132bef4d2baa5ea2c6
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external links, identified as a link farm, pointing to websites offering "free Robux" or "free coins" for games like Roblox and Coin Master. The document body and embedded links suggest a lure to potentially malicious websites that may host further malware or phishing content. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9013

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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-websites-2021-game-hack
    • http://chocolats-boccardi-carcassonne.com/images/free-roblox-groups-with-funds_GM431946152.pdf
    • http://chocolats-boccardi-carcassonne.com/images/coin-master-hack-without-verification-code-2021_GM406889139.pdf
    • http://chocolats-boccardi-carcassonne.com/images/coin-master-free-coins_GM406889139.pdf
    • http://chocolats-boccardi-carcassonne.com/images/free-minecraft-shaders_GM479516143.pdf
    • http://chocolats-boccardi-carcassonne.com/images/free-coin-master-spins-daily_GM406889139.pdf
    • http://chocolats-boccardi-carcassonne.com/images/how-to-get-minecraft-bedrock-for-free_GM479516143.pdf
    • http://chocolats-boccardi-carcassonne.com/images/free-coin-master-cards_GM406889139.pdf
    • http://chocolats-boccardi-carcassonne.com/images/minecraft-pe-hacks_GM479516143.pdf
    • http://chocolats-boccardi-carcassonne.com/images/free-spins-on-coin-master-app_GM406889139.pdf
    • http://chocolats-boccardi-carcassonne.com/images/moon-active_GM406889139.pdf
    • http://chocolats-boccardi-carcassonne.com/images/roblox-arsenal-hack-script-pastebin_GM431946152.pdf
    • http://chocolats-boccardi-carcassonne.com/images/coin-master-apk-hack-mod-download_GM406889139.pdf
    • http://chocolats-boccardi-carcassonne.com/images/coin-master-free-spins-app-for-iphone_GM406889139.pdf
    • http://chocolats-boccardi-carcassonne.com/images/roblox-com-free-robux_GM431946152.pdf
    • http://chocolats-boccardi-carcassonne.com/images/how-to-get-a-lot-of-robux_GM431946152.pdf
    • http://chocolats-boccardi-carcassonne.com/images/get-free-spins-for-coin-master_GM406889139.pdf
    • http://chocolats-boccardi-carcassonne.com/images/coin-master-32-android-mod-hack-apk-download_GM406889139.pdf
    • http://chocolats-boccardi-carcassonne.com/images/get-free-spins-on-coin-master-no-human-verification_GM406889139.pdf
    • http://chocolats-boccardi-carcassonne.com/images/coin-master-free-daily-spins-and-coins_GM406889139.pdf
    • http://chocolats-boccardi-carcassonne.com/images/coin-master-hack-apk-july-2021_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004ab5.bin
a874cc544857f8c2c3c4ae6fa5aef1566c5bddc90d94f3305ab0fade867a7f11		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AB5 26448 bytes
font_01_sfnt_off0000888d.bin
450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139		 pdf-font-stream PDF embedded font (sfnt) at offset 0x888D 5696 bytes
font_02_sfnt_off0000959f.bin
ef44fc6ccc8558fc54da3394cf76e38d99de94399ef86c3bb36f5b939f331685		 pdf-font-stream PDF embedded font (sfnt) at offset 0x959F 18836 bytes

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