Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b5b6fdafb654a30…

MALICIOUS

PDF

41.6 KB Created: 2021-05-13 02:10:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 868e51dc94feb7f370bdfac5db9f4e19 SHA-1: d3f8a20bc5ddc84825f486595e92c6cadfdc0587 SHA-256: 3b5b6fdafb654a30a5fb6ef2d5dd9db432f6c8ccf41ae157a39631da9019e993
162 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs and a link farm, heavily suggesting a phishing or scam attempt. The heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document explicitly asks for sensitive information like private keys or backup codes, which is a critical indicator of malicious intent. The presence of game-related lures like 'coinmaster-game-hack' and 'free-roblox-gift-card' further supports a social engineering attack pattern.

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.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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/coinmaster-game-hack
    • https://asiavisiontreks.com/userfiles/files/coin-master-mod-apk-hack_GM406889139.pdf
    • https://asiavisiontreks.com/userfiles/files/is-minecraft-free-on-pc_GM479516143.pdf
    • https://asiavisiontreks.com/userfiles/files/free-roblox-gift-card_GM431946152.pdf
    • https://asiavisiontreks.com/userfiles/files/google-how-do-you-get-free-robux_GM431946152.pdf
    • https://asiavisiontreks.com/userfiles/files/coin-master-hack-for-ios_GM406889139.pdf
    • https://asiavisiontreks.com/userfiles/files/100-free-spins-on-coin-master_GM406889139.pdf
    • https://asiavisiontreks.com/userfiles/files/how-to-get-free-robux-by-playing-games_GM431946152.pdf
    • https://asiavisiontreks.com/userfiles/files/coin-master-free-spins-iphone_GM406889139.pdf
    • https://asiavisiontreks.com/userfiles/files/hacks-for-minecraft-windows-10_GM479516143.pdf
    • https://asiavisiontreks.com/userfiles/files/free-robux-today_GM431946152.pdf
    • https://asiavisiontreks.com/userfiles/files/static-moonactive-net_GM406889139.pdf
    • https://asiavisiontreks.com/userfiles/files/2021-free-spins-coin-master_GM406889139.pdf
    • https://asiavisiontreks.com/userfiles/files/300-daily-free-spins-coin-master_GM406889139.pdf
    • https://asiavisiontreks.com/userfiles/files/how-to-hack-roblox-accounts-2021_GM431946152.pdf
    • https://asiavisiontreks.com/userfiles/files/minecraft-diamond-finder-hack_GM479516143.pdf
    • https://asiavisiontreks.com/userfiles/files/how-to-get-free-robux-on-ipad_GM431946152.pdf
    • https://asiavisiontreks.com/userfiles/files/how-to-hack-roblox-passwords_GM431946152.pdf
    • https://asiavisiontreks.com/userfiles/files/coin-master-tiradas-gratis-2021_GM406889139.pdf
    • https://asiavisiontreks.com/userfiles/files/blox-best-robux_GM431946152.pdf
    • https://asiavisiontreks.com/userfiles/files/hacks-para-roblox_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004a2b.bin
2d44ddf8a25eb0a328dd2046b0e3b642f4d33eda005f47f0a2c3e8aa59caa209		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A2B 24328 bytes
font_01_sfnt_off0000818c.bin
af208cdb45bd073d7b5ba90b2b5d7fe18c625e7bd90d48e59b2ee82d337b8146		 pdf-font-stream PDF embedded font (sfnt) at offset 0x818C 17808 bytes

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