Malicious PDF — malware analysis report

Static analysis result for SHA-256 032137306046cf3a…

MALICIOUS

PDF

44.1 KB Created: 2021-06-09 11:49:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 130c4f5621d2d6528f58dd37e0ee9747 SHA-1: e41bc21f2979e7fda2253a572c600693904d80c8 SHA-256: 032137306046cf3af44a5990cd920120723db420c248c3e36e6eda5d8e314037
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links to websites that appear to offer game cheats and hacks, such as 'Free Robux' and 'Coin Master Free Spins'. The ML classifier and PDF link farm heuristics indicate a high likelihood of malicious intent, likely to redirect users to malicious sites or download further payloads. The presence of external URIs and a link farm suggests a tactic to distribute malicious content or engage in SEO poisoning.

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-robux-games-on-roblox-link-game-hack
    • http://hk-kan.org/images/google-coin-master-free-spins_GM406889139.pdf
    • http://hk-kan.org/images/robux-fun-hack_GM431946152.pdf
    • http://hk-kan.org/images/get-free-spins-coin-master_GM406889139.pdf
    • http://hk-kan.org/images/coin-master-free-spins-hack_GM406889139.pdf
    • http://hk-kan.org/images/free-robux-without-human-verification_GM431946152.pdf
    • http://hk-kan.org/images/minecraft-hack-mod_GM479516143.pdf
    • http://hk-kan.org/images/get-free-tiktok-followers-no-verification_GM835599320.pdf
    • http://hk-kan.org/images/hack-coin-master-apk-32_GM406889139.pdf
    • http://hk-kan.org/images/how-to-hack-roblox-accounts-on-phone_GM431946152.pdf
    • http://hk-kan.org/images/roblox-comroblox_GM431946152.pdf
    • http://hk-kan.org/images/real-free-spins-for-coin-master_GM406889139.pdf
    • http://hk-kan.org/images/how-to-get-roebucks-in-roblox_GM431946152.pdf
    • http://hk-kan.org/images/roblox-pink-free-robux_GM431946152.pdf
    • http://hk-kan.org/images/minecraft-hacks-xbox_GM479516143.pdf
    • http://hk-kan.org/images/coin-master-free-attack-hack_GM406889139.pdf
    • http://hk-kan.org/images/what-games-on-roblox-give-you-free-robux_GM431946152.pdf
    • http://hk-kan.org/images/coin-master-free-spin-today_GM406889139.pdf
    • http://hk-kan.org/images/coin-master-free-spins-link-31-march-2021_GM406889139.pdf
    • http://hk-kan.org/images/coin-master-free-spins-hacktman_GM406889139.pdf
    • http://hk-kan.org/images/www-roblox-com-robux-free_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004e9b.bin
c90268167fb371bc53ba915bb738b1ef09ab355baf232894c06dc845c4e6e1cc		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E9B 25604 bytes
font_01_sfnt_off0000882e.bin
fca43613a2b424b4c825d1c5576b8756e405dbcd9398f3993ded8eaeb8cefab9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x882E 18868 bytes

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