Malicious PDF — malware analysis report

Static analysis result for SHA-256 3db3c3fddc3700a4…

MALICIOUS

PDF

45.7 KB Created: 2021-06-09 11:09:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 17047bf0f2035bd1a79dfae9393fb151 SHA-1: d4d7c13deadba5b55c2ef86cbefab673ae318fc6 SHA-256: 3db3c3fddc3700a42df5b1b1d33e84e6feb289da2eb8734072e1a584c83b836a
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links and a document body that promotes 'free Robux' and similar game-related scams. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, likely designed to direct users to malicious or phishing websites. The ML_NYX_PDF_MALICIOUS score further supports the malicious nature of this document, suggesting it's part of a broader phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 4

  • 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.
  • 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-free-robux-robux-robux-game-hack
    • https://elearning.mtsnurulyaqingtlo.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-no-verification_GM431946152.pdf
    • https://elearning.mtsnurulyaqingtlo.sch.id/__statics/gudangsoal/files/get-free-cards-for-coin-master_GM406889139.pdf
    • https://elearning.mtsnurulyaqingtlo.sch.id/__statics/gudangsoal/files/como-hackear-coin-master-sin-verificacion-humana_GM406889139.pdf
    • https://elearning.mtsnurulyaqingtlo.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-hack_GM431946152.pdf
    • https://elearning.mtsnurulyaqingtlo.sch.id/__statics/gudangsoal/files/free-roblox-stuff-2021_GM431946152.pdf
    • https://elearning.mtsnurulyaqingtlo.sch.id/__statics/gudangsoal/files/free-minecraft-bedrock-server-hosting-24-7_GM479516143.pdf
    • https://elearning.mtsnurulyaqingtlo.sch.id/__statics/gudangsoal/files/free-spins-coin-master-ios-2021_GM406889139.pdf
    • https://elearning.mtsnurulyaqingtlo.sch.id/__statics/gudangsoal/files/free-spin-coin-master-game_GM406889139.pdf
    • https://elearning.mtsnurulyaqingtlo.sch.id/__statics/gudangsoal/files/free-spins_GM406889139.pdf
    • https://elearning.mtsnurulyaqingtlo.sch.id/__statics/gudangsoal/files/coin-master-spin-hack-link_GM406889139.pdf
    • https://elearning.mtsnurulyaqingtlo.sch.id/__statics/gudangsoal/files/freerobuxhack-us-2021_GM431946152.pdf
    • https://elearning.mtsnurulyaqingtlo.sch.id/__statics/gudangsoal/files/how-to-get-java-minecraft-for-free_GM479516143.pdf
    • https://elearning.mtsnurulyaqingtlo.sch.id/__statics/gudangsoal/files/coin-master-free-daily-spins-today_GM406889139.pdf
    • https://elearning.mtsnurulyaqingtlo.sch.id/__statics/gudangsoal/files/card-hack-in-coin-master_GM406889139.pdf
    • https://elearning.mtsnurulyaqingtlo.sch.id/__statics/gudangsoal/files/coin-master-free-spin-and-trading-group_GM406889139.pdf
    • https://elearning.mtsnurulyaqingtlo.sch.id/__statics/gudangsoal/files/free-likes-for-tiktok_GM835599320.pdf
    • https://elearning.mtsnurulyaqingtlo.sch.id/__statics/gudangsoal/files/classic-minecraft-net-hacks_GM479516143.pdf
    • https://elearning.mtsnurulyaqingtlo.sch.id/__statics/gudangsoal/files/free-robux-images_GM431946152.pdf
    • https://elearning.mtsnurulyaqingtlo.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-easy-2021_GM431946152.pdf
    • https://elearning.mtsnurulyaqingtlo.sch.id/__statics/gudangsoal/files/free-promo-codes-for-robux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000050b9.bin
a5206a71b566df47a8448f12f6be06b7c29e356356ae784d9850f3bcc68bd917		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50B9 28396 bytes
font_01_sfnt_off000090e6.bin
3ef9e48aa3d97d4217e004f7625a8cbae9320a74231b80a01553f6433e422360		 pdf-font-stream PDF embedded font (sfnt) at offset 0x90E6 18012 bytes

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