Malicious PDF — malware analysis report

Static analysis result for SHA-256 766b3bc95df35c67…

MALICIOUS

PDF

46.5 KB Created: 2021-06-03 14:25:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: d661a7afc852aa6a77b26034de7bbbcc SHA-1: f2978022cfcfe505e98d87f38383e9607acc16f4 SHA-256: 766b3bc95df35c67a0f5f5e1780f7273b81e786fcdc9e503737da3749ad798ab
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links to external websites, many of which appear to be part of a link farm designed to distribute potentially malicious files. The document body's theme of "Free Robux Redeem Codes" is a common lure for phishing and malware distribution. The ML classifier strongly indicated maliciousness, and the presence of a link farm heuristic further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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.online/app/431946152/free-robux-redeem-codes-game-hack
    • http://perpus.poltekeskupang.ac.id/repository/coin-master-hack-mod-apk-free-download_GM406889139.pdf
    • http://perpus.poltekeskupang.ac.id/repository/coin-master-free-download-for-pc_GM406889139.pdf
    • http://perpus.poltekeskupang.ac.id/repository/is-free-followers-on-tiktok-free_GM835599320.pdf
    • http://perpus.poltekeskupang.ac.id/repository/coin-master-free-spins-and-coins-app-download_GM406889139.pdf
    • http://perpus.poltekeskupang.ac.id//repository/minecraft-free-download-apk-softonic_GM479516143.pdf
    • http://perpus.poltekeskupang.ac.id/repository/how-to-get-minecraft-bedrock-edition-on-pc-for-free_GM479516143.pdf
    • http://perpus.poltekeskupang.ac.id/repository/coin-master-jackpot-hack_GM406889139.pdf
    • http://perpus.poltekeskupang.ac.id/repository/coin-master-free-spin-bonus_GM406889139.pdf
    • http://perpus.poltekeskupang.ac.id//repository/roblox-website-robux_GM431946152.pdf
    • http://perpus.poltekeskupang.ac.id//repository/roblox-online-free_GM431946152.pdf
    • http://perpus.poltekeskupang.ac.id/repository/how-do-you-hack-minecraft_GM479516143.pdf
    • http://perpus.poltekeskupang.ac.id/repository/free-shields-coin-master_GM406889139.pdf
    • http://perpus.poltekeskupang.ac.id//repository/hacks-for-minecraft-windows-10_GM479516143.pdf
    • http://perpus.poltekeskupang.ac.id/repository/coin-master-free-stuff-links_GM406889139.pdf
    • http://perpus.poltekeskupang.ac.id/repository/free-minecraft-bedrock_GM479516143.pdf
    • http://perpus.poltekeskupang.ac.id//repository/free-pet-food-for-coin-master_GM406889139.pdf
    • http://perpus.poltekeskupang.ac.id//repository/app-master_GM406889139.pdf
    • http://perpus.poltekeskupang.ac.id/repository/android-coin-master-3433-apk-hack_GM406889139.pdf
    • http://perpus.poltekeskupang.ac.id//repository/roblox-games-that-give-you-free-robux_GM431946152.pdf
    • http://perpus.poltekeskupang.ac.id/repository/coin-master-code-hack_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000052b1.bin
be63eafc089650d827d93d6e1da97f1d2ccc982c6cd989ddeb24ec19efecf51e		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52B1 28216 bytes
font_01_sfnt_off000092ae.bin
ac1fbd71dc65d7a5013a2beb110170fe519d7ae17df877d161357825f85fd2ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92AE 18448 bytes

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