Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b918a24a6c49d03…

MALICIOUS

PDF

48.1 KB Created: 2021-05-14 07:44:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: aff8d4946608c63bd0565f94b0af58ee SHA-1: c4589790975e4ed4adf6866d1d8aad3cbb65e054 SHA-256: 3b918a24a6c49d030e766b06d09541a857ed6de663528efb67874b2be6adcced
102 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, designed to direct users to potentially malicious websites. The document body, though partially corrupted, suggests a lure related to 'Free Robux' and game cheats, aligning with common phishing and scam tactics. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9013

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.xyz/app/431946152/free-robux-without-human-verification-real-game-hack
    • http://polycraft.ae/uploaded_files/userfiles/files/free-robux-codes-no-human-verification_GM431946152.pdf
    • http://polycraft.ae/uploaded_files/userfiles/files/get-robux-today_GM431946152.pdf
    • http://polycraft.ae/uploaded_files/userfiles/files/roblox-promo-codes-for-free-robux_GM431946152.pdf
    • http://polycraft.ae/uploaded_files/userfiles/files/how-to-download-minecraft-java-edition-for-free_GM479516143.pdf
    • http://polycraft.ae/uploaded_files/userfiles/files/minecraft-xbox-one-edition-digital-code-free_GM479516143.pdf
    • http://polycraft.ae/uploaded_files/userfiles/files/how-to-hack-coin-master-ios-jailbreak_GM406889139.pdf
    • http://polycraft.ae/uploaded_files/userfiles/files/coin-master-hack-mod-apk-35-8_GM406889139.pdf
    • http://polycraft.ae/uploaded_files/userfiles/files/free-roblox-money_GM431946152.pdf
    • http://polycraft.ae/uploaded_files/userfiles/files/how-to-hack-and-get-free-robux_GM431946152.pdf
    • http://polycraft.ae/uploaded_files/userfiles/files/roblox-zone-free-robux_GM431946152.pdf
    • http://polycraft.ae/uploaded_files/userfiles/files/minecraft-java-edition-free-trial_GM479516143.pdf
    • http://polycraft.ae/uploaded_files/userfiles/files/coin-master-hack-tool-india_GM406889139.pdf
    • http://polycraft.ae/uploaded_files/userfiles/files/get-free-spins-from-coin-master_GM406889139.pdf
    • http://polycraft.ae/uploaded_files/userfiles/files/can-you-give-me-free-robux_GM431946152.pdf
    • http://polycraft.ae/uploaded_files/userfiles/files/coin-master-daily-bonus_GM406889139.pdf
    • http://polycraft.ae/uploaded_files/userfiles/files/get-robux_GM431946152.pdf
    • http://polycraft.ae/uploaded_files/userfiles/files/archery-master-3d-hack-unlimited-coins-cheats_GM406889139.pdf
    • http://polycraft.ae/uploaded_files/userfiles/files/free-spin-coin-master-online_GM406889139.pdf
    • http://polycraft.ae/uploaded_files/userfiles/files/moon-active-games_GM406889139.pdf
    • http://polycraft.ae/uploaded_files/userfiles/files/free-coin-coin-master_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004cd9.bin
c84bdc73b2241228d2b1cac05e035c9c9df9995ad65d8372eb723b62a79fb1b6		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4CD9 26184 bytes
font_01_sfnt_off00008a0b.bin
9a13c2580265a78e8a7257496a31ee0055738af7e20a5661c2902efe4bf05ce5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A0B 5596 bytes
font_02_sfnt_off000096b2.bin
fcd37aae12381262441149b3f055c838aea0a99c045645b338d4096dcdd54a9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96B2 19296 bytes

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