Malicious PDF — malware analysis report

Static analysis result for SHA-256 8815be2ecd2cfab7…

MALICIOUS

PDF

33.5 KB Created: 2021-07-04 07:43:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: a0306374ec37dfcf94b9fb82dbefc469 SHA-1: ecdf164cd0f78bf40be73ac1b7cdaae4257b4a3e SHA-256: 8815be2ecd2cfab795ec03dd4923440d06fe5370e951cb82922f07cc99846db0
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are SEO-optimized PDF documents related to game hacks and currency. The presence of a direct URL to 'netcdn.tw' suggests an attempt to download a second-stage payload. The document body, though heavily obfuscated, contains references to game hacks and URLs, reinforcing the lure-based attack pattern.

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/www-robux-game-hack
    • https://ethraa.ae/userfiles/files/como-hackear-coin-master-2021_GM406889139.pdf
    • https://ethraa.ae/userfiles/files/coin-master-free-spins-link-march-2021_GM406889139.pdf
    • https://ethraa.ae/userfiles/files/how-to-get-free-robux-on-roblox-2021_GM431946152.pdf
    • https://ethraa.ae/userfiles/files/hack-roblox-players_GM431946152.pdf
    • https://ethraa.ae/userfiles/files/clean-master-hack-coins_GM406889139.pdf
    • https://ethraa.ae/userfiles/files/how-to-hack-roblox-accounts-on-phone-2021_GM431946152.pdf
    • https://ethraa.ae/userfiles/files/how-to-get-free-robux-without-human-verification-2021_GM431946152.pdf
    • https://ethraa.ae/userfiles/files/pokemon-go-free-602_GM1094591345.pdf
    • https://ethraa.ae/userfiles/files/free-spins-in-coin-master-without-human-verification_GM406889139.pdf
    • https://ethraa.ae/userfiles/files/how-to-change-your-username-on-roblox-for-free-2021_GM431946152.pdf
    • https://ethraa.ae/userfiles/files/free-robux-no-human-verification-2021_GM431946152.pdf
    • https://ethraa.ae/userfiles/files/how-do-i-get-free-robux_GM431946152.pdf
    • https://ethraa.ae/userfiles/files/coin-master-free-spins-link-iphone_GM406889139.pdf
    • https://ethraa.ae/userfiles/files/free-spin-and-coin-links_GM406889139.pdf
    • https://ethraa.ae/userfiles/files/coin-master-free-spins-blogspot_GM406889139.pdf
    • https://ethraa.ae/userfiles/files/rblx-gg-tons-of-robux-free_GM431946152.pdf
    • https://ethraa.ae/userfiles/files/coin-master-hack-unlimited-spins-apk-download_GM406889139.pdf
    • https://ethraa.ae/userfiles/files/coin-master-hack-mod-apk-free-download_GM406889139.pdf
    • https://ethraa.ae/userfiles/files/create-minecraft-server-free_GM479516143.pdf
    • https://ethraa.ae/userfiles/files/how-do-you-get-free-food-on-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_off00002c3e.bin
a62f88babcdc52e270fdcd7d6435703f608648474f2ec0e34f5d3a13f252bbf9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2C3E 22368 bytes
font_01_sfnt_off00005e05.bin
d0da06c06563365e25d678163380f8c7fa6b55e71fb2929e51ced219e7911ccc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E05 18912 bytes

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