Malicious PDF — malware analysis report

Static analysis result for SHA-256 9de3c75a09de10d4…

MALICIOUS

PDF

46.5 KB Created: 2021-05-13 03:02:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: f899cf6deabbb57af075e09fe121de5b SHA-1: 9d0d4c70f4490fdb952bffb08d2f466daa08e9b5 SHA-256: 9de3c75a09de10d4408322569aa2bc1cb1e19f723067109ac93cd0fd7aaa32e9
122 Risk Score

Malware Insights

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

The document presents a lure for 'free Robux' and displays a fake CAPTCHA, indicating an attempt to trick the user into interacting with malicious content. It contains multiple embedded URLs, one of which is directly linked to a fake CAPTCHA heuristic, suggesting the primary goal is to redirect users to a site that likely hosts further malware or phishing content. No scripts were extracted, but the PDF structure and embedded URLs are strong indicators of a malicious download or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

Heuristics 5

  • 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
  • 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 https://netcdn.xyz/app/431946152/how-to-get-free-robux-without-human-verification-game-hack
    • https://surpetgarut-tmcollection.com/ckfinder/userfiles/files/how-to-get-robux-for-free-2021_GM431946152.pdf
    • https://surpetgarut-tmcollection.com/ckfinder/userfiles/files/coin-master-free-box_GM406889139.pdf
    • https://surpetgarut-tmcollection.com/ckfinder/userfiles/files/grabpoints-robux_GM431946152.pdf
    • https://surpetgarut-tmcollection.com/ckfinder/userfiles/files/coin-master-links-to-get-free-spins_GM406889139.pdf
    • https://surpetgarut-tmcollection.com/ckfinder/userfiles/files/minecraft-bedrock-free_GM479516143.pdf
    • https://surpetgarut-tmcollection.com/ckfinder/userfiles/files/free-robux-kid-friendly-no-human-verification_GM431946152.pdf
    • https://surpetgarut-tmcollection.com/ckfinder/userfiles/files/free-spin-link-for-coin-master-haktuts_GM406889139.pdf
    • https://surpetgarut-tmcollection.com/ckfinder/userfiles/files/free-roblox-hack_GM431946152.pdf
    • https://surpetgarut-tmcollection.com/ckfinder/userfiles/files/coin-master-game-free-play-online_GM406889139.pdf
    • https://surpetgarut-tmcollection.com/ckfinder/userfiles/files/coin-master-free-spins-link-without-human-verification_GM406889139.pdf
    • https://surpetgarut-tmcollection.com/ckfinder/userfiles/files/how-to-get-free-robux-easy-hack_GM431946152.pdf
    • https://surpetgarut-tmcollection.com/ckfinder/userfiles/files/roblox-its-free_GM431946152.pdf
    • https://surpetgarut-tmcollection.com/ckfinder/userfiles/files/free-robux-no-download_GM431946152.pdf
    • https://surpetgarut-tmcollection.com/ckfinder/userfiles/files/coin-master-free-spins-link-2021-blogger_GM406889139.pdf
    • https://surpetgarut-tmcollection.com/ckfinder/userfiles/files/how-to-hack-coin-master-without-root_GM406889139.pdf
    • https://surpetgarut-tmcollection.com/ckfinder/userfiles/files/free-robux-scams_GM431946152.pdf
    • https://surpetgarut-tmcollection.com/ckfinder/userfiles/files/claimrbx-free-robux_GM431946152.pdf
    • https://surpetgarut-tmcollection.com/ckfinder/userfiles/files/coin-master-cards-free-cards_GM406889139.pdf
    • https://surpetgarut-tmcollection.com/ckfinder/userfiles/files/robloxmatchcom-free-robux_GM431946152.pdf
    • https://surpetgarut-tmcollection.com/ckfinder/userfiles/files/free-minecraft-coloring-pages_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004c40.bin
0789ac4251222e3b45656d37da9d8cd8f86dddb11c4e9faa4fd909cad5a4e29a		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C40 25876 bytes
font_01_sfnt_off00008650.bin
10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8650 2880 bytes
font_02_sfnt_off0000903a.bin
c7994a70f951e7a274445218605a0e5dad46067da7d3a89c75279f94e76bcfde		 pdf-font-stream PDF embedded font (sfnt) at offset 0x903A 19388 bytes

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