Malicious PDF — malware analysis report

Static analysis result for SHA-256 a00de0e51d834ee5…

MALICIOUS

PDF

43.5 KB Created: 2021-05-17 13:32:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: ec3cb950a1ecd6c58c4dedd30cecf1df SHA-1: 844443bd03ed606a86628d86570a3cc1e92ee92a SHA-256: a00de0e51d834ee58e721ea880e2be755e11df01e6359e41fbd32f9948941ebf
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which are SEO-optimized and point to sites offering "hacks" or "free spins" for popular games. The ML classifier strongly flagged this PDF as malicious, and the presence of a "download button" heuristic further supports a malicious intent. The primary goal appears to be directing users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 4

  • 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.
  • 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.xyz/app/406889139/coin-master-free-spins-today-new-game-hack
    • http://anisio.eti.br/ckfinder/userfiles/files/coin-master-hack-generator-tool_GM406889139.pdf
    • http://anisio.eti.br/ckfinder/userfiles/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdf
    • http://anisio.eti.br/ckfinder/userfiles/files/free-domain-for-minecraft-server_GM479516143.pdf
    • http://anisio.eti.br/ckfinder/userfiles/files/free-roblox-app_GM431946152.pdf
    • http://anisio.eti.br/ckfinder/userfiles/files/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdf
    • http://anisio.eti.br/ckfinder/userfiles/files/free-spins-and-coins-coin-master_GM406889139.pdf
    • http://anisio.eti.br/ckfinder/userfiles/files/websites-that-give-free-robux_GM431946152.pdf
    • http://anisio.eti.br/ckfinder/userfiles/files/free-robux-legit_GM431946152.pdf
    • http://anisio.eti.br/ckfinder/userfiles/files/coin-master-hack-mod-apk-35-8_GM406889139.pdf
    • http://anisio.eti.br/ckfinder/userfiles/files/free-coin-master-spins-for-today_GM406889139.pdf
    • http://anisio.eti.br/ckfinder/userfiles/files/free-robux-without-verification-or-survey_GM431946152.pdf
    • http://anisio.eti.br/ckfinder/userfiles/files/how-to-hack-a-roblox-account-easy_GM431946152.pdf
    • http://anisio.eti.br/ckfinder/userfiles/files/how-to-hack-people-on-roblox_GM431946152.pdf
    • http://anisio.eti.br/ckfinder/userfiles/files/coin-master-free-spin-link-today-2021_GM406889139.pdf
    • http://anisio.eti.br/ckfinder/userfiles/files/easy-robux-hack_GM431946152.pdf
    • http://anisio.eti.br/ckfinder/userfiles/files/how-to-get-free-robux-without-downloading-apps_GM431946152.pdf
    • http://anisio.eti.br/ckfinder/userfiles/files/easy-way-to-get-robux_GM431946152.pdf
    • http://anisio.eti.br/ckfinder/userfiles/files/how-to-get-free-gold-cards-on-coin-master_GM406889139.pdf
    • http://anisio.eti.br/ckfinder/userfiles/files/hacks-for-coin-master_GM406889139.pdf
    • http://anisio.eti.br/ckfinder/userfiles/files/how-do-i-get-robux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004b74.bin
fe7afb45d6fbc5db5c99f066c16f4829f344ba878f6d35dbfe9ad10281cbea0d
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B74 25948 bytes
font_01_sfnt_off00008730.bin
18e77bbf6fe8462b755cd6d2d41f5b898be86405eb57ffa87df3bebfe1b33752
pdf-font-stream PDF embedded font (sfnt) at offset 0x8730 18404 bytes