Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff41fcbf8fd5f897…

MALICIOUS

PDF

48.7 KB Created: 2021-06-11 13:38:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 656fbbc130c36bd2d8329dbf6aa32f7e SHA-1: f124da72495df3848627c3f961f06abb4b50b6c6 SHA-256: ff41fcbf8fd5f8975a0ebbeaf085ffd79b612bbca835e8bc535f02893ef4fc64
62 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The document contains a prominent link to 'roblox-hack-online-on-jailbreak-game-hack', suggesting a lure for game cheats or exploits. The presence of a download button heuristic and numerous embedded URLs further supports a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.tw/app/431946152/roblox-hack-online-on-jailbreak-game-hack
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/free-spins-on-coin-master_GM406889139.pdf
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/free-face-roblox-2021_GM431946152.pdf
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/free-robux-no-human-verification-2021_GM431946152.pdf
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/coin-master-hack-apk-35-8_GM406889139.pdf
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/cute-shirts-that-are-free-roblox_GM431946152.pdf
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/free-robux-without-human-verification-2021_GM431946152.pdf
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/my-roblox-account-was-hacked_GM431946152.pdf
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/free-robux-on-iphone_GM431946152.pdf
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/free-robux-hack_GM431946152.pdf
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/roblox-demon_GM431946152.pdf
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/how-to-get-free-robux-on-iphone_GM431946152.pdf
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/earn-free-robux-for-roblox_GM431946152.pdf
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/roblox-free-bir_GM431946152.pdf
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/roblox-com-free-robux_GM431946152.pdf
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/roblox-hacked-accounts-list_GM431946152.pdf
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/free-robux-generator-no-human-verification-2021_GM431946152.pdf
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/roblox-people-girl_GM431946152.pdf
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/how-to-sue-roblox_GM431946152.pdf
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/can-you-get-minecraft-for-free-on-pc_GM479516143.pdf
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/free-robux-reddit_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000535e.bin
e3faf0e9fa51f6d11e130a6c8e389126dc9346ace68c060085812c9d26bb4320		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x535E 27440 bytes
font_01_sfnt_off0000919a.bin
45bf821f81e84f4aa8d8374f492b182b36404f38b462c7dc471deaad6ab5c104		 pdf-font-stream PDF embedded font (sfnt) at offset 0x919A 2824 bytes
font_02_sfnt_off00009b48.bin
a2fe989801fcb599809be13a3255e18e4928ed030f8f00832641d986da65a4f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B48 18468 bytes

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