Malicious PDF — malware analysis report

Static analysis result for SHA-256 848194696189b37d…

MALICIOUS

PDF

35.4 KB Created: 2021-07-06 08:14:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 565341c11ba2beaf7439d628d075885f SHA-1: 6a868112e98e953dfe4a5a5b3dd741bb08685de4 SHA-256: 848194696189b37db8160efffefd63e994ad2e78be81b67d1c36fb01d6ed311d
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are SEO-optimized PDFs, suggesting a link farm designed to attract users searching for game cheats or free in-game items. The primary URL http://netcdn.tw/app/431946152/game-give-free-robux-game-hack is directly related to offering free Robux, a virtual currency for the game Roblox. The presence of a "download button" lure and the ML classifier's high confidence score further support the malicious intent of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.tw/app/431946152/game-give-free-robux-game-hack
    • http://elearning.mtsmatholiulhudabugel.com/__statics/gudangsoal/files/free-roblox-account-with-ultimate-driving-cars_GM431946152.pdf
    • http://elearning.mtsmatholiulhudabugel.com/__statics/gudangsoal/files/christmas-tree-hack-roblox_GM431946152.pdf
    • http://elearning.mtsmatholiulhudabugel.com/__statics/gudangsoal/files/mcpe-optifine_GM479516143.pdf
    • http://elearning.mtsmatholiulhudabugel.com/__statics/gudangsoal/files/hacks-and-cheats-for-coin-master_GM406889139.pdf
    • http://elearning.mtsmatholiulhudabugel.com/__statics/gudangsoal/files/free-coin-master-links_GM406889139.pdf
    • http://elearning.mtsmatholiulhudabugel.com/__statics/gudangsoal/files/free-robux-generator-com-roblox-hack_GM431946152.pdf
    • http://elearning.mtsmatholiulhudabugel.com/__statics/gudangsoal/files/free-coin-master-spins-link_GM406889139.pdf
    • http://elearning.mtsmatholiulhudabugel.com/__statics/gudangsoal/files/roblox-how-to-report-a-hacker_GM431946152.pdf
    • http://elearning.mtsmatholiulhudabugel.com/__statics/gudangsoal/files/how-to-hack-roblox-for-robux_GM431946152.pdf
    • http://elearning.mtsmatholiulhudabugel.com/__statics/gudangsoal/files/how-to-get-free-robux_GM431946152.pdf
    • http://elearning.mtsmatholiulhudabugel.com/__statics/gudangsoal/files/minecraft-server-hacks_GM479516143.pdf
    • http://elearning.mtsmatholiulhudabugel.com/__statics/gudangsoal/files/roblox-dumb-smart-cheater_GM431946152.pdf
    • http://elearning.mtsmatholiulhudabugel.com/__statics/gudangsoal/files/free-spins-coin-master-2021_GM406889139.pdf
    • http://elearning.mtsmatholiulhudabugel.com/__statics/gudangsoal/files/free-roblox-accounts-with-robux_GM431946152.pdf
    • http://elearning.mtsmatholiulhudabugel.com/__statics/gudangsoal/files/free-spins-coin-master-2021-today_GM406889139.pdf
    • http://elearning.mtsmatholiulhudabugel.com/__statics/gudangsoal/files/free-ways-to-get-robux_GM431946152.pdf
    • http://elearning.mtsmatholiulhudabugel.com/__statics/gudangsoal/files/how-to-hack-roblox-accounts-on-phone-2021_GM431946152.pdf
    • http://elearning.mtsmatholiulhudabugel.com/__statics/gudangsoal/files/roblox-free-tony-stark-tshirt_GM431946152.pdf
    • http://elearning.mtsmatholiulhudabugel.com/__statics/gudangsoal/files/pubg-uc-website-free_GM1330123889.pdf
    • http://elearning.mtsmatholiulhudabugel.com/__statics/gudangsoal/files/free-online-spins-coin-master_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000033c7.bin
6bb52053e875c7a40b45062e457f6ff5f235ac6051f373b365ba2290605a560a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x33C7 22208 bytes
font_01_sfnt_off0000651a.bin
69813dd6a6bd245aee50b944f0193d6275a7494d00db293a689fcf826d12d1cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x651A 19208 bytes

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