Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d30ffd7c67ff002…

MALICIOUS

PDF

42.9 KB Created: 2021-05-20 06:38:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 94bf95b80e2a8f67b683c537ef700d5d SHA-1: 91c530914d84d7572bc90883d99ac33362bd020b SHA-256: 1d30ffd7c67ff002d6e7c04f5d01ca721fef8b86b4aa42312c49f274c160e382
142 Risk Score

Malware Insights

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

This PDF document employs a fake CAPTCHA lure to trick users into clicking malicious links, likely for game hacks or currency. The document contains numerous external links, many pointing to PDF files hosted on suspicious domains, suggesting a link farm or phishing campaign. No scripts were extracted, but the presence of a fake CAPTCHA and numerous malicious URLs strongly indicates a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/431946152/robux-com-free-robux-game-hack
    • http://church01.jworld.i-powers.com.tw/webdata/ckfinder/public/userfiles/files/rbxoffers-earn-free-robux_GM431946152.pdf
    • http://church01.jworld.i-powers.com.tw/webdata/ckfinder/public/userfiles/files/mcpe-master-hack-unlimited-coins-apk_GM406889139.pdf
    • http://church01.jworld.i-powers.com.tw/webdata/ckfinder/public/userfiles/files/roblox-its-free_GM431946152.pdf
    • http://church01.jworld.i-powers.com.tw/webdata/ckfinder/public/userfiles/files/how-to-get-free-robux-fast-and-easy_GM431946152.pdf
    • http://church01.jworld.i-powers.com.tw/webdata/ckfinder/public/userfiles/files/no-human-verification_GM431946152.pdf
    • http://church01.jworld.i-powers.com.tw/webdata/ckfinder/public/userfiles/files/coin-master-hack-version-ios_GM406889139.pdf
    • http://church01.jworld.i-powers.com.tw/webdata/ckfinder/public/userfiles/files/free-coin-master-spin-generator_GM406889139.pdf
    • http://church01.jworld.i-powers.com.tw/webdata/ckfinder/public/userfiles/files/free-roblox-accounts_GM431946152.pdf
    • http://church01.jworld.i-powers.com.tw/webdata/ckfinder/public/userfiles/files/how-to-hack-coin-master-spin_GM406889139.pdf
    • http://church01.jworld.i-powers.com.tw/webdata/ckfinder/public/userfiles/files/how-to-get-free-robux-with-no-verification_GM431946152.pdf
    • http://church01.jworld.i-powers.com.tw/webdata/ckfinder/public/userfiles/files/toolbox-for-minecraft-pe-ios_GM479516143.pdf
    • http://church01.jworld.i-powers.com.tw/webdata/ckfinder/public/userfiles/files/coin-master-free-spins-link-blogspot-2021_GM406889139.pdf
    • http://church01.jworld.i-powers.com.tw/webdata/ckfinder/public/userfiles/files/coin-master-free-spins-and-coins-haktuts_GM406889139.pdf
    • http://church01.jworld.i-powers.com.tw/webdata/ckfinder/public/userfiles/files/coin-master-hacks-for-android_GM406889139.pdf
    • http://church01.jworld.i-powers.com.tw/webdata/ckfinder/public/userfiles/files/spin-link_GM406889139.pdf
    • http://church01.jworld.i-powers.com.tw/webdata/ckfinder/public/userfiles/files/free-robux-without-any-verification_GM431946152.pdf
    • http://church01.jworld.i-powers.com.tw/webdata/ckfinder/public/userfiles/files/free-links-for-coin-master_GM406889139.pdf
    • http://church01.jworld.i-powers.com.tw/webdata/ckfinder/public/userfiles/files/how-much-robux-can-you-get-with-1-million-dollars_GM431946152.pdf
    • http://church01.jworld.i-powers.com.tw/webdata/ckfinder/public/userfiles/files/roblox-but_GM431946152.pdf
    • http://church01.jworld.i-powers.com.tw/webdata/ckfinder/public/userfiles/files/free-roblox-accounts-with-robux-that-work-not-banned-2021_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004a19.bin
a54be345db9dcd4e35516b588fafdb217a30c940c4789a0739909c1478581e4a		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A19 25364 bytes
font_01_sfnt_off00008559.bin
15a0db03ecad41b32ad15729058012b5ee1d917146ec7af3e780186d41394abc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8559 18276 bytes

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