Malicious PDF — malware analysis report

Static analysis result for SHA-256 25544bed0119fbf2…

MALICIOUS

PDF

34.9 KB Created: 2021-06-29 17:54:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 85652bf5dff93bab6e7fa6382588468e SHA-1: 9b018e4dae793305c0b37e26e2d5d6ffeddebb94 SHA-256: 25544bed0119fbf2d543c0ac06491fff85c236c3940a87b42cd5779f1b7a75a4
82 Risk Score

Malware Insights

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

The document uses a lure related to obtaining free Robux, a virtual currency, to trick users into clicking a malicious link. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs and a password archive lure further supports a malicious intent. The primary goal appears to be directing users to download a second-stage payload from the provided URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://netcdn.co/app/431946152/how-do-you-get-free-robux-on-roblox.com-game-hack
    • http://library.atim.ac.id/repository/bandit-free-roblox_GM431946152.pdf
    • http://library.atim.ac.id/repository/haktuts-2021-coin-master-free-spin-link_GM406889139.pdf
    • http://library.atim.ac.id/repository/how-do-you-get-free-robux-without-downloading-apps_GM431946152.pdf
    • http://library.atim.ac.id/repository/game-give-free-robux_GM431946152.pdf
    • http://library.atim.ac.id/repository/rbxoffers-com-free-robux_GM431946152.pdf
    • http://library.atim.ac.id/repository/how-do-we-get-free-robux_GM431946152.pdf
    • http://library.atim.ac.id/repository/rbxboost-com-free-robux_GM431946152.pdf
    • http://library.atim.ac.id/repository/jailbreak-roblox-hack_GM431946152.pdf
    • http://library.atim.ac.id/repository/20219-walk-speed-roblox-cheat_GM431946152.pdf
    • http://library.atim.ac.id/repository/free-spins-and-coins-coin-master_GM406889139.pdf
    • http://library.atim.ac.id/repository/roblox-free-wings-to-wear_GM431946152.pdf
    • http://library.atim.ac.id/repository/free-robux-at-http-rxnow-eu5-net_GM431946152.pdf
    • http://library.atim.ac.id/repository/how-to-legally-get-free-spins-in-coin-master_GM406889139.pdf
    • http://library.atim.ac.id/repository/roblox-rb-world-2-clothes-hack_GM431946152.pdf
    • http://library.atim.ac.id/repository/robux-redeem_GM431946152.pdf
    • http://library.atim.ac.id/repository/roblox-apocalypse-rising-hack-exploit_GM431946152.pdf
    • http://library.atim.ac.id/repository/roblox-20219-robux-hack-versao-2390202159_GM431946152.pdf
    • http://library.atim.ac.id/repository/btools-hack-script-roblox_GM431946152.pdf
    • http://library.atim.ac.id/repository/discord-free-roblox-hacks_GM431946152.pdf
    • http://library.atim.ac.id/repository/free-minecraft-account-and-password-2021_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00002e59.bin
0f126ddf42f9758914a6bf150a76f48179503ff4c19c63e559d9b92d1db0ae89		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2E59 22876 bytes
font_01_sfnt_off00006191.bin
9bbc2ecb5d3b34f2733bb0ab95862c66fca5c47853f59c890bf079ae70b11733		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6191 19712 bytes

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