Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d3ff21a9b84676b…

MALICIOUS

PDF

48.4 KB Created: 2021-06-08 10:34:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 7589876d52adec766c9f2c081fd8aa32 SHA-1: 3c7f7ef2224514a7117e3c5302539d1a5d9d595c SHA-256: 3d3ff21a9b84676b872e5bc1faa372af625d53f7217db1cc241c7de4c14cf54c
142 Risk Score

Malware Insights

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

This PDF document exhibits malicious characteristics, including a fake CAPTCHA lure and a large number of external links, many of which point to files related to game hacks and cheats. The primary URL, 'https://netcdn.tw/app/431946152/free-robux-copying-and-pasting-easy-game-hack', suggests a social engineering attempt to trick users into downloading or executing further malicious content. The document's structure and content strongly indicate a phishing or scam attempt designed to exploit user interest in free in-game currency.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

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.tw/app/431946152/free-robux-copying-and-pasting-easy-game-hack
    • https://elearningaliyah.almubarakddi.org/__statics/gudangsoal/files/how-to-download-minecraft-hacks_GM479516143.pdf
    • https://elearningaliyah.almubarakddi.org/__statics/gudangsoal/files/how-to-download-minecraft-for-free_GM479516143.pdf
    • https://elearningaliyah.almubarakddi.org/__statics/gudangsoal/files/free-robux-hacks-no-verification_GM431946152.pdf
    • https://elearningaliyah.almubarakddi.org/__statics/gudangsoal/files/how-to-get-free-robux-hack_GM431946152.pdf
    • https://elearningaliyah.almubarakddi.org/__statics/gudangsoal/files/rbx-robux_GM431946152.pdf
    • https://elearningaliyah.almubarakddi.org/__statics/gudangsoal/files/appsmobinfo-coinmasterhack-coin-master-hack_GM406889139.pdf
    • https://elearningaliyah.almubarakddi.org/__statics/gudangsoal/files/mcpe-master-free-coins_GM406889139.pdf
    • https://elearningaliyah.almubarakddi.org/__statics/gudangsoal/files/daily-free-spins-on-coin-master_GM406889139.pdf
    • https://elearningaliyah.almubarakddi.org/__statics/gudangsoal/files/pubg-uc-yollama_GM1330123889.pdf
    • https://elearningaliyah.almubarakddi.org/__statics/gudangsoal/files/get-free-cards-coin-master_GM406889139.pdf
    • https://elearningaliyah.almubarakddi.org/__statics/gudangsoal/files/is-pokemon-go-a-free-app_GM1094591345.pdf
    • https://elearningaliyah.almubarakddi.org/__statics/gudangsoal/files/roblox36com-free-robux_GM431946152.pdf
    • https://elearningaliyah.almubarakddi.org/__statics/gudangsoal/files/oprewards-free-robux_GM431946152.pdf
    • https://elearningaliyah.almubarakddi.org/__statics/gudangsoal/files/free-spin-coin-master-app-download_GM406889139.pdf
    • https://elearningaliyah.almubarakddi.org/__statics/gudangsoal/files/free-spins-coin-master-hack-2021_GM406889139.pdf
    • https://elearningaliyah.almubarakddi.org/__statics/gudangsoal/files/how-can-i-get-free-spins-on-coin-master_GM406889139.pdf
    • https://elearningaliyah.almubarakddi.org/__statics/gudangsoal/files/coin-master-card-hack-app_GM406889139.pdf
    • https://elearningaliyah.almubarakddi.org/__statics/gudangsoal/files/how-to-hack-roblox-for-robux_GM431946152.pdf
    • https://elearningaliyah.almubarakddi.org/__statics/gudangsoal/files/roblox-free-robux-hack_GM431946152.pdf
    • https://elearningaliyah.almubarakddi.org/__statics/gudangsoal/files/coin-master-spin-link-free_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000051d7.bin
c306ba3addb6ca17821f76f29505c60a7387f572513aed9eb8e25d0f429fb08b		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51D7 31392 bytes
font_01_sfnt_off0000977c.bin
ffd2ad648f36aba28a9bec70361b661c7b3703430596bf37fe38565be274522f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x977C 19436 bytes

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