Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f7140605c4fd3c5…

MALICIOUS

PDF

49.9 KB Created: 2021-05-17 00:07:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 105323025ea93b021e89635075b523e9 SHA-1: ac0abbc91db6893acc8b1297338ebdc4b40874d0 SHA-256: 7f7140605c4fd3c5f1781dfc3c75a61e6410e5839f7204013186d47a5eae21a8
102 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which appear to be SEO-optimized for game-related terms. The primary URL points to a site offering 'Coin Master Free Spin Link Today', suggesting a lure for free in-game currency or cheats. The presence of a link farm and the ML classifier's high confidence score indicate a malicious intent, likely to drive traffic to spam or potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8642

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-2021-spin-link-today-game-hack
    • http://westt.com.br/ckfinder/userfiles/files/promo-codes-for-free-robux_GM431946152.pdf
    • http://westt.com.br/ckfinder/userfiles/files/will-minecraft-dungeons-be-free_GM479516143.pdf
    • http://westt.com.br/ckfinder/userfiles/files/coin-master-cheat-codes_GM406889139.pdf
    • http://westt.com.br/ckfinder/userfiles/files/coin-master-links-that-don-t-expire_GM406889139.pdf
    • http://westt.com.br/ckfinder/userfiles/files/free-coin-spin-coin-master_GM406889139.pdf
    • http://westt.com.br/ckfinder/userfiles/files/games-in-roblox-that-give-you-robux_GM431946152.pdf
    • http://westt.com.br/ckfinder/userfiles/files/hey-google-how-do-you-get-free-robux_GM431946152.pdf
    • http://westt.com.br/ckfinder/userfiles/files/download-hack-coin-master-apk_GM406889139.pdf
    • http://westt.com.br/ckfinder/userfiles/files/roblox-robux-generator-http-freerobuxgenerator-xyz_GM431946152.pdf
    • http://westt.com.br/ckfinder/userfiles/files/how-to-get-free-robux-easy_GM431946152.pdf
    • http://westt.com.br/ckfinder/userfiles/files/can-you-get-free-robux-on-roblox_GM431946152.pdf
    • http://westt.com.br/ckfinder/userfiles/files/robloxhacks_GM431946152.pdf
    • http://westt.com.br/ckfinder/userfiles/files/uprobuxcom-free-robux_GM431946152.pdf
    • http://westt.com.br/ckfinder/userfiles/files/how-to-get-free-robux-on-iphone_GM431946152.pdf
    • http://westt.com.br/ckfinder/userfiles/files/7-year-old-roblox_GM431946152.pdf
    • http://westt.com.br/ckfinder/userfiles/files/coin-master-free-spins-cheat_GM406889139.pdf
    • http://westt.com.br/ckfinder/userfiles/files/free-robux-com-real_GM431946152.pdf
    • http://westt.com.br/ckfinder/userfiles/files/how-to-hack-peoples-roblox-accounts_GM431946152.pdf
    • http://westt.com.br/ckfinder/userfiles/files/mcpe-master-hack-coins_GM406889139.pdf
    • http://westt.com.br/ckfinder/userfiles/files/coin-master-free_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004dad.bin
6d892d82f71ccfbb13b6db79be7ab442d4bdf383e0d8cd0552cd35a7faf69bc5		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4DAD 24752 bytes
font_01_sfnt_off000086e8.bin
a17c2a746d49ac23b23e38a371e32fddecfcd91b10cf42ff6155bff6b8a07e91		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86E8 4028 bytes
font_02_sfnt_off00009489.bin
6fd7c7f447d66842f81aa8cf197935b17f22157d0c7e9f95622df1b5b4ddf530		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9489 2788 bytes
font_03_sfnt_off00009e79.bin
7f624a4da072bd42e21ae13ab081f80009d2c012a41e181bc6a40f65c236f9bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E79 18812 bytes

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