Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c3a23603b411134…

MALICIOUS

PDF

45.2 KB Created: 2021-05-13 17:32:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 7e0d34ba73a84e61005be40abd948244 SHA-1: f73da3c1fa3cbab27a6d87f83b4a6d761aaaba7c SHA-256: 8c3a23603b411134642dfd9c5c52ed13e6927a02cb92c96d7c6b8e810e4ba933
62 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains lures for free Robux and includes a prominent external URI pointing to a suspicious domain. The presence of a download button lure and callback lure suggests a phishing or scam attempt. Although no scripts were directly extracted, the ML classifier strongly indicates maliciousness, and the document's content and associated URLs are consistent with a phishing campaign aiming to trick users into downloading malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9621

Heuristics 4

  • 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 https://netcdn.xyz/app/431946152/give-free-robux-game-hack
    • http://razredna-nastava.net/files/bux-gg-robux-free_GM431946152.pdf
    • https://razredna-nastava.net/files/coin-master-hack-mod-apk-free-download_GM406889139.pdf
    • http://razredna-nastava.net/files/roblox-free-rubox_GM431946152.pdf
    • https://razredna-nastava.net/files/coin-master-free-items_GM406889139.pdf
    • https://razredna-nastava.net/files/coin-master-free-spins-link-deutsch-ios_GM406889139.pdf
    • https://razredna-nastava.net/files/coin-master-free-coins-hack_GM406889139.pdf
    • http://razredna-nastava.net/files/minecraft-116-1-download_GM479516143.pdf
    • http://razredna-nastava.net/files/coin-master-hack_GM406889139.pdf
    • https://razredna-nastava.net/files/how-to-hack-roblox-accounts-on-phone-2021_GM431946152.pdf
    • http://razredna-nastava.net/files/get-free-minecraft-account_GM479516143.pdf
    • https://razredna-nastava.net/files/robux-rewards_GM431946152.pdf
    • https://razredna-nastava.net/files/how-to-hack-roblox-games_GM431946152.pdf
    • https://razredna-nastava.net/files/how-to-cheat-in-roblox_GM431946152.pdf
    • http://razredna-nastava.net/files/games-that-give-free-robux_GM431946152.pdf
    • https://razredna-nastava.net/files/how-to-get-free-cards-in-coin-master_GM406889139.pdf
    • http://razredna-nastava.net/files/coin-master-cracked-apk-free-download_GM406889139.pdf
    • https://razredna-nastava.net/files/roblox-sued_GM431946152.pdf
    • http://razredna-nastava.net/files/how-do-you-get-free-robux-2021_GM431946152.pdf
    • https://razredna-nastava.net/files/robux-without-verification_GM431946152.pdf
    • http://razredna-nastava.net/files/free-minecraft-account-reddit_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004918.bin
0d8e8d5bb27193c390686316519f590a8e39e3b9d62a0aee51217178a5aa5ef3
pdf-font-stream PDF embedded font (sfnt) at offset 0x4918 25252 bytes
font_01_sfnt_off0000842a.bin
eb230542719c96b42e3fd8bb01e35f13ebd5f02629049da3a58e7fd7607bf48a
pdf-font-stream PDF embedded font (sfnt) at offset 0x842A 2940 bytes
font_02_sfnt_off00008e39.bin
ea59f1cb8b041c2b832a039673c57edae81c360e33a5bea04888abdf43ec1c43
pdf-font-stream PDF embedded font (sfnt) at offset 0x8E39 18248 bytes