Malicious PDF — malware analysis report

Static analysis result for SHA-256 0531ade647810484…

MALICIOUS

PDF

32.9 KB Created: 2021-06-25 11:56:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: db1742e8fca89b6285f41c559f3c8365 SHA-1: 7b35d6d86ebd8dbef3e7fe0842c31b7aec477a3f SHA-256: 0531ade6478104841eb868cf354e7a4f2d544b9ac5ddecc660ae45dcde722564
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous links to external websites, many of which are SEO-optimized and appear to be part of a link farm. The primary URL, http://netcdn.co/app/431946152/btools-hack-for-roblox-link-game-hack, suggests a lure for game cheats or hacks. The presence of a 'download button' lure and callback phishing indicators further support a malicious intent to trick users into downloading or interacting with harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

Heuristics 5

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 http://netcdn.co/app/431946152/btools-hack-for-roblox-link-game-hack
    • https://www.opertus-me.com/uploaded_files/userfiles/files/coin-master-daily-free-spins-link-2021_GM406889139.pdf
    • https://www.opertus-me.com/uploaded_files/userfiles/files/how-to-get-free-robux-easy-2021_GM431946152.pdf
    • https://www.opertus-me.com/uploaded_files/userfiles/files/free-minecraft-server-hosting-with-plugins_GM479516143.pdf
    • https://www.opertus-me.com/uploaded_files/userfiles/files/online-coin-master-free-spin-app_GM406889139.pdf
    • https://www.opertus-me.com/uploaded_files/userfiles/files/free-minecraft-account-and-password-2021_GM479516143.pdf
    • https://www.opertus-me.com/uploaded_files/userfiles/files/how-to-get-free-robux-on-phone-2021_GM431946152.pdf
    • https://www.opertus-me.com/uploaded_files/userfiles/files/free-daily-spin-coin-master-game_GM406889139.pdf
    • https://www.opertus-me.com/uploaded_files/userfiles/files/how-to-create-group-in-coin-master-free-spins_GM406889139.pdf
    • https://www.opertus-me.com/uploaded_files/userfiles/files/coin-master-free-spins-link-2021-haktuts_GM406889139.pdf
    • https://www.opertus-me.com/uploaded_files/userfiles/files/mcpe-master-coin-hack-apk_GM406889139.pdf
    • https://www.opertus-me.com/uploaded_files/userfiles/files/free-robux-generator-for-kids_GM431946152.pdf
    • https://www.opertus-me.com/uploaded_files/userfiles/files/free-robux-2021_GM431946152.pdf
    • https://www.opertus-me.com/uploaded_files/userfiles/files/mcpe-master-hack-unlimited-coins_GM406889139.pdf
    • https://www.opertus-me.com/uploaded_files/userfiles/files/funny-tshirts-for-free-roblox_GM431946152.pdf
    • https://www.opertus-me.com/uploaded_files/userfiles/files/coin-master-reward-link-2021_GM406889139.pdf
    • https://www.opertus-me.com/uploaded_files/userfiles/files/how-to-get-free-robux-fast-and-easy_GM431946152.pdf
    • https://www.opertus-me.com/uploaded_files/userfiles/files/roblox-redeem-codes-free_GM431946152.pdf
    • https://www.opertus-me.com/uploaded_files/userfiles/files/roblox-making-hacker-smilator_GM431946152.pdf
    • https://www.opertus-me.com/uploaded_files/userfiles/files/free-coin_GM406889139.pdf
    • https://www.opertus-me.com/uploaded_files/userfiles/files/roblox-arsenal-hack_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002c6f.bin
d360acffcdcb436fb5e80d7900ab1a0f5fdfda1616452c1ecb772571a3e89798		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2C6F 21768 bytes
font_01_sfnt_off00005bec.bin
dc913086b1a8b176b50677ea5e770f0085627d1474101706157346920678e343		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BEC 19044 bytes

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