Malicious PDF — malware analysis report

Static analysis result for SHA-256 5163f33371d4c6aa…

MALICIOUS

PDF

44.2 KB Created: 2021-05-15 13:16:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 6e9990eee3d71a977a10193816dbcbcd SHA-1: 58138af0f81550c6483157db574d8c1dfacc0cfe SHA-256: 5163f33371d4c6aa5147bc1f349dde5e59d9ede4e84285c8da297d90f03b275b
102 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, many of which are SEO-optimized and point to sites offering free in-game currency or cheats for popular games. The ML classifier strongly flagged this PDF as malicious, and the presence of a 'download button' heuristic suggests a deceptive user interface. The document's primary purpose appears to be directing users to potentially malicious websites that could lead to phishing or the download of further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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-and-coins-today-gift-reward-game-hack
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/como-generar-coin-master-free-spins_GM406889139.pdf
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/free-robux-generator-no-human-verification-2021_GM431946152.pdf
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/free-coins-and-spins-for-coin-master-game_GM406889139.pdf
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/free-robux-no-verification-or-survey_GM431946152.pdf
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/coin-master-hack-without-verify_GM406889139.pdf
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/coin-master-apk_GM406889139.pdf
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/coin-master-free-spins-hack_GM406889139.pdf
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/how-to-get-free-pet-snacks-in-coin-master_GM406889139.pdf
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/my-roblox-account-was-hacked_GM431946152.pdf
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/100-free-spins-for-coin-master_GM406889139.pdf
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/minecraft-esp_GM479516143.pdf
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/how-to-get-robux-on-phone_GM431946152.pdf
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/free-robux-hack-2021_GM431946152.pdf
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/links-for-coin-master-free-spins_GM406889139.pdf
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/free-spins-on-coin-master_GM406889139.pdf
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/how-to-get-free-robux-games_GM431946152.pdf
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/orewards-com-free-robux_GM431946152.pdf
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/coin-blogspot_GM406889139.pdf
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/pig-master-free-coins-and-spins_GM406889139.pdf
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/coin-master-free-redeem-code_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004bbc.bin
9c72234dcd2fcafe038569c1b37e9bdec61f9db17740545b7c46582ca851d63c		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BBC 26928 bytes
font_01_sfnt_off00008a3f.bin
20323906fae34ef48fb3028b175607ed26afea8233a7a83525bcd6516f32abbb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A3F 18404 bytes

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