Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e4f9dd0566ec1d5…

MALICIOUS

PDF

45.5 KB Created: 2021-06-04 00:31:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 56fb7f0351e3ad5c3f4427512a83bed8 SHA-1: 782eb2179fd32e2d4138e8ed7849783c80635836 SHA-256: 4e4f9dd0566ec1d5ebcf5bfe615009407632fce14d066398a9d8bfeb3d628206
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous links to external websites, many of which are structured as SEO-optimized PDF links, suggesting a link farm or content aggregation tactic. The document body and extracted URLs indicate a lure for free Robux or game hacks, consistent with phishing or potentially unwanted software distribution. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs and a download button lure further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.online/app/431946152/free-robux-no-verification-or-survey-game-hack
    • http://lc.pustaka.unand.ac.id/repository/free-roblox-accounts-2021-with-robux_GM431946152.pdf
    • http://lc.pustaka.unand.ac.id/repository/coin-master-spin-ml-link_GM406889139.pdf
    • http://lc.pustaka.unand.ac.id/repository/how-to-hack-roblox-accounts-on-phone-2021_GM431946152.pdf
    • http://lc.pustaka.unand.ac.id/repository/how-to-get-roblox-premium-for-free-2021_GM431946152.pdf
    • http://lc.pustaka.unand.ac.id/repository/minecraft-hacks-for-2b2t_GM479516143.pdf
    • http://lc.pustaka.unand.ac.id/repository/coin-master-download-hack-ios_GM406889139.pdf
    • http://lc.pustaka.unand.ac.id/repository/roblox-tower-battles-hack-script_GM431946152.pdf
    • http://lc.pustaka.unand.ac.id/repository/free-spins-coin-master_GM406889139.pdf
    • http://lc.pustaka.unand.ac.id/repository/free-coin-master-spins-2021_GM406889139.pdf
    • http://lc.pustaka.unand.ac.id/repository/how-to-hack-coin-master-ios-2021_GM406889139.pdf
    • http://lc.pustaka.unand.ac.id/repository/free-robux-hack_GM431946152.pdf
    • http://lc.pustaka.unand.ac.id/repository/coin-master-pet-food-free_GM406889139.pdf
    • http://lc.pustaka.unand.ac.id/repository/robux-free-robux_GM431946152.pdf
    • http://lc.pustaka.unand.ac.id/repository/get-free-robux-generator_GM431946152.pdf
    • http://lc.pustaka.unand.ac.id/repository/free-spins-on-coin-master_GM406889139.pdf
    • http://lc.pustaka.unand.ac.id/repository/how-to-get-minecraft-for-free-on-mobile_GM479516143.pdf
    • http://lc.pustaka.unand.ac.id/repository/free-spins-from-coin-master_GM406889139.pdf
    • http://lc.pustaka.unand.ac.id/repository/coin-master-hack-version-2021-free-download_GM406889139.pdf
    • http://lc.pustaka.unand.ac.id/repository/free-spin-coin-master-2021-link_GM406889139.pdf
    • http://lc.pustaka.unand.ac.id/repository/pubg-uc-code-redeem_GM1330123889.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000051e7.bin
f3625f69a71ac4d0d4c3341ef621eaf36cb8e19d02803f330a97aeb54bd4b767		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51E7 26628 bytes
font_01_sfnt_off00008d62.bin
85e8471d4bb7809b16494b43ecc998cec7f87bafeaec38a3001510264e72f0e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D62 18892 bytes

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