Malicious PDF — malware analysis report

Static analysis result for SHA-256 c99aacbdeb4dabdd…

MALICIOUS

PDF

44.9 KB Created: 2021-05-19 01:33:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 9657efa5e2ebfcb8038979627abe9c73 SHA-1: 7c08321b0ee1c93dfcb30562068cebbd388811fc SHA-256: c99aacbdeb4dabdd2d114ec765d10bdc07b6510038bc49cda2df9f0ea092bb30
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains a fake CAPTCHA lure, designed to trick users into interacting with the document. It embeds a large number of external links, many of which point to potentially malicious content related to game cheats and free virtual currency. The primary malicious URL identified is https://netcdn.xyz/app/431946152/free-robux-picture-game-hack, which likely serves as a landing page for a scam or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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/free-robux-picture-game-hack
    • https://www.sman3amlapura.sch.id/new/public/ckfinder/userfiles/files/how-to-get-free-robux-on-roblox-2021_GM431946152.pdf
    • https://www.sman3amlapura.sch.id/new/public/ckfinder/userfiles/files/robux-free-promo-codes_GM431946152.pdf
    • https://www.sman3amlapura.sch.id/new/public/ckfinder/userfiles/files/free-apk-mods-coin-master_GM406889139.pdf
    • https://www.sman3amlapura.sch.id/new/public/ckfinder/userfiles/files/free-spin-codes-coin-master_GM406889139.pdf
    • https://www.sman3amlapura.sch.id/new/public/ckfinder/userfiles/files/coin-master-free-coins-link-2021-deutsch_GM406889139.pdf
    • https://www.sman3amlapura.sch.id/new/public/ckfinder/userfiles/files/coin-master-free-spins-2021-today_GM406889139.pdf
    • https://www.sman3amlapura.sch.id/new/public/ckfinder/userfiles/files/coin-master-hacks-no-downloading_GM406889139.pdf
    • https://www.sman3amlapura.sch.id/new/public/ckfinder/userfiles/files/free-robux-without-downloading-apps_GM431946152.pdf
    • https://www.sman3amlapura.sch.id/new/public/ckfinder/userfiles/files/how-to-get-free-robux-for-free_GM431946152.pdf
    • https://www.sman3amlapura.sch.id/new/public/ckfinder/userfiles/files/free-robux-working_GM431946152.pdf
    • https://www.sman3amlapura.sch.id/new/public/ckfinder/userfiles/files/how-to-get-free-spins-and-coins-in-coin-master_GM406889139.pdf
    • https://www.sman3amlapura.sch.id/new/public/ckfinder/userfiles/files/robux-generator-no-verification-needed_GM431946152.pdf
    • https://www.sman3amlapura.sch.id/new/public/ckfinder/userfiles/files/haktuts-coin-master-spins_GM406889139.pdf
    • https://www.sman3amlapura.sch.id/new/public/ckfinder/userfiles/files/free-spins-and-coins-on-coin-master_GM406889139.pdf
    • https://www.sman3amlapura.sch.id/new/public/ckfinder/userfiles/files/earn-robux-com_GM431946152.pdf
    • https://www.sman3amlapura.sch.id/new/public/ckfinder/userfiles/files/coin-master-free-cards_GM406889139.pdf
    • https://www.sman3amlapura.sch.id/new/public/ckfinder/userfiles/files/roblox-printables-free_GM431946152.pdf
    • https://www.sman3amlapura.sch.id/new/public/ckfinder/userfiles/files/daily-free-spins-coin-master-2021_GM406889139.pdf
    • https://www.sman3amlapura.sch.id/new/public/ckfinder/userfiles/files/coin-master-codes_GM406889139.pdf
    • https://www.sman3amlapura.sch.id/new/public/ckfinder/userfiles/files/roblox-free-robux-codes_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004e88.bin
25aaac74119af9072e48f49a7a36cca9abfc956603f63d8e3900e2f822beaa61		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E88 26956 bytes
font_01_sfnt_off00008d01.bin
34b0e3a58c66b2af54b16d5c8d734c4555ce81663a4a6734022a64244545498a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D01 18392 bytes

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