Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d4ff49fe1c05eb1…

MALICIOUS

PDF

44.5 KB Created: 2021-06-10 21:45:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: a2f918f8148382006344550b2929d29c SHA-1: ad752571d48c126047ceed278a9d9317e40da128 SHA-256: 2d4ff49fe1c05eb17a239e93ba1227ff3920ffa5fc713873ead0153541f18efe
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, many of which point to other PDF files hosted on external domains, suggesting a link farm or a method to distribute further malicious content. The document body and heuristics indicate a lure related to game hacks and cheats, combined with a 'password-protected archive' lure, which is a common tactic to bypass security filters. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.
  • 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.tw/app/431946152/how-to-run-faster-in-roblox-hack-game-hack
    • http://e-library.dharmawangsa.ac.id/repository/tiktok-free-view-iphone-wallpaper_GM835599320.pdf
    • http://e-library.dharmawangsa.ac.id/repository/free-robux-no-password-or-phone-number-needed_GM431946152.pdf
    • http://e-library.dharmawangsa.ac.id/repository/how-to-get-free-robux-hack_GM431946152.pdf
    • http://e-library.dharmawangsa.ac.id/repository/roblox-cheats-to-get-free-builders-club_GM431946152.pdf
    • http://e-library.dharmawangsa.ac.id/repository/ww-roblox-come_GM431946152.pdf
    • http://e-library.dharmawangsa.ac.id/repository/coin-master-spin-rewards_GM406889139.pdf
    • http://e-library.dharmawangsa.ac.id/repository/free-roblox-accounts-2021-with-robux_GM431946152.pdf
    • http://e-library.dharmawangsa.ac.id/repository/free-spins-coin-master-app_GM406889139.pdf
    • http://e-library.dharmawangsa.ac.id/repository/how-to-get-free-robux-promo-codes_GM431946152.pdf
    • http://e-library.dharmawangsa.ac.id/repository/free-minecraft-premium-account_GM479516143.pdf
    • http://e-library.dharmawangsa.ac.id/repository/how-to-get-free-robux-in-roblox-on-ios_GM431946152.pdf
    • http://e-library.dharmawangsa.ac.id/repository/coin-master-free-spons-apk-2021_GM406889139.pdf
    • http://e-library.dharmawangsa.ac.id/repository/download-coin-master-hack_GM406889139.pdf
    • http://e-library.dharmawangsa.ac.id/repository/minecraft-115-2-hacks_GM479516143.pdf
    • http://e-library.dharmawangsa.ac.id/repository/how-to-get-minecraft-pe-for-free_GM479516143.pdf
    • http://e-library.dharmawangsa.ac.id/repository/free-spins-coin-master-without-survey_GM406889139.pdf
    • http://e-library.dharmawangsa.ac.id/repository/coin-master-free-coin-and-spin-app_GM406889139.pdf
    • http://e-library.dharmawangsa.ac.id/repository/coin-master-free-spins-link-blogspot_GM406889139.pdf
    • http://e-library.dharmawangsa.ac.id/repository/how-to-get-free-robux-2021-no-human-verification_GM431946152.pdf
    • http://e-library.dharmawangsa.ac.id/repository/free-cool-lit-clothes-on-roblox_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004ecc.bin
683b7d2356f4884d311f4674bcc2f693d66ed2e49eaac15cb98dd102335958f7		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4ECC 25272 bytes
font_01_sfnt_off000089a9.bin
f108fab5b58dec5a3a0d6d32ff69a5dce5718821af76872b2d826c9e8b0857a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89A9 18756 bytes

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