Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a762a7cb9931379…

MALICIOUS

PDF

43.8 KB Created: 2021-06-09 14:36:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: eefe3bdd062ddfd1c781035bb0b1254e SHA-1: 34e83ce03c22eaf72619fc527566280c2d8934f8 SHA-256: 6a762a7cb993137977b894da39287299ea33f492974917891cb438b818698ac6
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, identified as a link farm, pointing to sites offering free in-game items and currency. The ML classifier strongly indicated maliciousness, and the presence of external URIs suggests a phishing or malware distribution attempt. While no scripts were explicitly extracted, the structure and content strongly imply a lure for users to click through to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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 https://netcdn.tw/app/431946152/free-roblox-cocdes-game-hack
    • https://digilib.stimlog.ac.id/repository/free-robux-no-survey-or-human-verification_GM431946152.pdf
    • https://digilib.stimlog.ac.id/repository/how-to-get-free-robux-on-phone_GM431946152.pdf
    • https://digilib.stimlog.ac.id/repository/how-to-play-minecraft-for-free-on-pc_GM479516143.pdf
    • http://digilib.stimlog.ac.id/repository/how-to-get-100-robux-for-free_GM431946152.pdf
    • https://digilib.stimlog.ac.id/repository/how-to-hack-roblox-accounts-on-phone_GM431946152.pdf
    • http://digilib.stimlog.ac.id/repository/coin-master-free-pet-snacks_GM406889139.pdf
    • https://digilib.stimlog.ac.id/repository/coin-master-game-2021-free-spin-link_GM406889139.pdf
    • http://digilib.stimlog.ac.id/repository/free-robux-hack-that-really-really-actually-works_GM431946152.pdf
    • https://digilib.stimlog.ac.id/repository/apps-that-give-you-free-robux_GM431946152.pdf
    • http://digilib.stimlog.ac.id/repository/free-robux-today_GM431946152.pdf
    • https://digilib.stimlog.ac.id/repository/how-to-get-unlimited-robux_GM431946152.pdf
    • http://digilib.stimlog.ac.id/repository/roblox-script-executor-free-dd_GM431946152.pdf
    • https://digilib.stimlog.ac.id/repository/free-robux-codes-2021-without-human-verification_GM431946152.pdf
    • http://digilib.stimlog.ac.id/repository/how-to-get-free-group-on-roblox_GM431946152.pdf
    • https://digilib.stimlog.ac.id/repository/win-free-robux_GM431946152.pdf
    • http://digilib.stimlog.ac.id/repository/coin-master-free-spins-and-coins-daily-links_GM406889139.pdf
    • https://digilib.stimlog.ac.id/repository/roblox-ad-maker-free_GM431946152.pdf
    • https://digilib.stimlog.ac.id/repository/cheat-engine-64-speed-hack-roblox_GM431946152.pdf
    • https://digilib.stimlog.ac.id/repository/minecraft-bedrock-edition-pc-free_GM479516143.pdf
    • http://digilib.stimlog.ac.id/repository/how-do-you-hack-roblox_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000050b0.bin
ea19f3251570828cc54ea4337fd9a10db3aca19b43d7e4cd64cc0536ca9ed6da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x50B0 25076 bytes
font_01_sfnt_off00008936.bin
bf5749c2d0037b859d0cd87982caa1e8b6a6fbec56f00eaa386bc4b12cbc8a10		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8936 18124 bytes

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