Malicious PDF — malware analysis report

Static analysis result for SHA-256 f464f87c4cf5d312…

MALICIOUS

PDF

36.2 KB Created: 2021-07-03 19:57:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 1a15573b156481b1623408a0ceede400 SHA-1: c9c09ea4774f44ae125ac88933d6fd01871a2e1b SHA-256: f464f87c4cf5d3120b9a4bc22c3b4ce03fdf1d6bd272ac100ea069c930e84503
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are structured as SEO-optimized PDF links, suggesting a link farm or scam operation. The document body and extracted URLs indicate a lure for free in-game items for popular games like Coin Master and Roblox. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/free-spins-coin-master-2021-today-game-hack
    • http://elearning.manmabar.sch.id/__statics/gudangsoal/files/roblox-free-robux-website_GM431946152.pdf
    • http://elearning.manmabar.sch.id/__statics/gudangsoal/files/coin-master-link-app_GM406889139.pdf
    • http://elearning.manmabar.sch.id/__statics/gudangsoal/files/is-there-a-free-version-of-minecraft_GM479516143.pdf
    • http://elearning.manmabar.sch.id/__statics/gudangsoal/files/minecraft-java-edition-for-free_GM479516143.pdf
    • http://elearning.manmabar.sch.id/__statics/gudangsoal/files/how-to-buy-robux-for-free_GM431946152.pdf
    • http://elearning.manmabar.sch.id/__statics/gudangsoal/files/coin-master-new-link-free-spin_GM406889139.pdf
    • http://elearning.manmabar.sch.id/__statics/gudangsoal/files/free-robux-that-actually-works-2021_GM431946152.pdf
    • http://elearning.manmabar.sch.id/__statics/gudangsoal/files/coin-master-hack-ios-without-verification_GM406889139.pdf
    • http://elearning.manmabar.sch.id/__statics/gudangsoal/files/roblox-cheat-engine-use_GM431946152.pdf
    • http://elearning.manmabar.sch.id/__statics/gudangsoal/files/coin-master-daily-free-spins-link_GM406889139.pdf
    • http://elearning.manmabar.sch.id/__statics/gudangsoal/files/free-robux-with-no-verification-2021_GM431946152.pdf
    • http://elearning.manmabar.sch.id/__statics/gudangsoal/files/minecraft-bedrock-edition-free_GM479516143.pdf
    • http://elearning.manmabar.sch.id/__statics/gudangsoal/files/coin-master-hacks-free-spins_GM406889139.pdf
    • http://elearning.manmabar.sch.id/__statics/gudangsoal/files/free-robux-codes-not-used_GM431946152.pdf
    • http://elearning.manmabar.sch.id/__statics/gudangsoal/files/free-roblox-gift-card-codes-2021_GM431946152.pdf
    • http://elearning.manmabar.sch.id/__statics/gudangsoal/files/how-to-get-minecraft-windows-10-edition-for-free_GM479516143.pdf
    • http://elearning.manmabar.sch.id/__statics/gudangsoal/files/free-spin-and-coin-blogspot-com_GM406889139.pdf
    • http://elearning.manmabar.sch.id/__statics/gudangsoal/files/cm-free-spins-and-coins_GM406889139.pdf
    • http://elearning.manmabar.sch.id/__statics/gudangsoal/files/how-to-hack-something-into-your-roblox-inventory_GM431946152.pdf
    • http://elearning.manmabar.sch.id/__statics/gudangsoal/files/free-robux-games-that-actually-work_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000344d.bin
c8409939ebc558161260dcfccb10de9bb79ddbae5fc01c98bccdb3b8269c48e5		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x344D 23356 bytes
font_01_sfnt_off000068fd.bin
dadcf5174bb2e6041b94f83e832c5e3e9a18ba888fbfa9b44f22d907c203bba1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68FD 18928 bytes

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