Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2c230032d118f07…

MALICIOUS

PDF

43.4 KB Created: 2021-05-15 01:08:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 4f80cc07d4d614ee6bdb0f928c113337 SHA-1: 710faa07b6d02b2b5db47dcd34bd5a05107a6fbb SHA-256: d2c230032d118f075217e0b8f3ed052f96b1daa3096ca84444b92c1f2c7fdcd7
102 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which point to files with names suggesting game hacks or cheats. The ML classifier strongly indicated maliciousness, and the presence of a 'download button' heuristic further supports a malicious intent to trick users into downloading unwanted applications. The document body, though heavily obfuscated, contains URLs that are also listed as IOCs.

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-hack-apk-3.5-33-game-hack
    • https://biospray-online.com/ckfinder/userfiles/files/coin-master-mod-apk-hack_GM406889139.pdf
    • https://biospray-online.com/ckfinder/userfiles/files/free-coin-master-spins-no-verification_GM406889139.pdf
    • https://biospray-online.com/ckfinder/userfiles/files/free-robux-hacks-no-verification_GM431946152.pdf
    • https://biospray-online.com/ckfinder/userfiles/files/free-flip-master-coins_GM406889139.pdf
    • https://biospray-online.com/ckfinder/userfiles/files/free-coin-and-spin-in-coin-master_GM406889139.pdf
    • https://biospray-online.com/ckfinder/userfiles/files/coin-master-cheats-without-verification_GM406889139.pdf
    • https://biospray-online.com/ckfinder/userfiles/files/coin-master-level-3_GM406889139.pdf
    • https://biospray-online.com/ckfinder/userfiles/files/free-coin-master-spins-blogger_GM406889139.pdf
    • https://biospray-online.com/ckfinder/userfiles/files/robuxglobalcom_GM431946152.pdf
    • https://biospray-online.com/ckfinder/userfiles/files/coinmaster-links_GM406889139.pdf
    • https://biospray-online.com/ckfinder/userfiles/files/how-to-hack-someones-roblox-account_GM431946152.pdf
    • https://biospray-online.com/ckfinder/userfiles/files/minecraft-free-education_GM479516143.pdf
    • https://biospray-online.com/ckfinder/userfiles/files/coin-master-15-free-spin-link-of-last-5-days_GM406889139.pdf
    • https://biospray-online.com/ckfinder/userfiles/files/free-coin-spin-daily-link-coin-master_GM406889139.pdf
    • https://biospray-online.com/ckfinder/userfiles/files/free-spins_GM406889139.pdf
    • https://biospray-online.com/ckfinder/userfiles/files/free-robux-games-on-roblox_GM431946152.pdf
    • https://biospray-online.com/ckfinder/userfiles/files/cute-free-hair-on-roblox_GM431946152.pdf
    • https://biospray-online.com/ckfinder/userfiles/files/free-coins-coin-master-blog_GM406889139.pdf
    • https://biospray-online.com/ckfinder/userfiles/files/gain-robux_GM431946152.pdf
    • https://biospray-online.com/ckfinder/userfiles/files/how-to-hack-roblox-accounts-2021_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004dd7.bin
3df20ffe44cda3e902f64edffb5e1e5103c3212d36b3c8e08dc09f27506356ec
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4DD7 25136 bytes
font_01_sfnt_off00008773.bin
207b50af2482ee3d64012f5b90db49de9a3b7179575478186b363639781f396d
pdf-font-stream PDF embedded font (sfnt) at offset 0x8773 18268 bytes