Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c3cb784d48369a1…

MALICIOUS

PDF

33.8 KB Created: 2021-07-06 10:07:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 82745664df16ad554e2556f2e7f30598 SHA-1: b27a5333dec50e97b1044ddd372531f8d6a371b5 SHA-256: 5c3cb784d48369a11ee617f07cb30c33c7e9dd3035ff873b8525c47d8ad6b6c6
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF document contains heuristics indicating a fake CAPTCHA and links to external URLs, suggesting a social engineering lure to trick users into downloading or accessing potentially malicious content. The document body and embedded URLs promote game hacks and cheats, aligning with a phishing or scamming attack pattern. No scripts were extracted, but the presence of external links and the fake CAPTCHA heuristic strongly suggest an attempt to lead the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/coin-master-hack-tool-for-pc-game-hack
    • http://etd.ilmukomunikasi.fisip.ulm.ac.id//repository/minecraft-xbox-one-edition-digital-code-free_GM479516143.pdf
    • http://etd.ilmukomunikasi.fisip.ulm.ac.id//repository/can-u-get-free-robux_GM431946152.pdf
    • http://etd.ilmukomunikasi.fisip.ulm.ac.id//repository/how-to-earn-free-robux_GM431946152.pdf
    • http://etd.ilmukomunikasi.fisip.ulm.ac.id/repository/free-robux-script_GM431946152.pdf
    • http://etd.ilmukomunikasi.fisip.ulm.ac.id/repository/roblox-skins-boy-free_GM431946152.pdf
    • http://etd.ilmukomunikasi.fisip.ulm.ac.id//repository/pokemon-go-free-coins_GM1094591345.pdf
    • http://etd.ilmukomunikasi.fisip.ulm.ac.id/repository/how-to-buy-pubg-uc-for-free_GM1330123889.pdf
    • http://etd.ilmukomunikasi.fisip.ulm.ac.id//repository/minecraft-ps4-free_GM479516143.pdf
    • http://etd.ilmukomunikasi.fisip.ulm.ac.id//repository/hack-coins-in-coin-master_GM406889139.pdf
    • http://etd.ilmukomunikasi.fisip.ulm.ac.id/repository/free-ways-to-get-robux-on-roblox_GM431946152.pdf
    • http://etd.ilmukomunikasi.fisip.ulm.ac.id//repository/robux-scam_GM431946152.pdf
    • http://etd.ilmukomunikasi.fisip.ulm.ac.id//repository/apps-that-give-you-free-robux_GM431946152.pdf
    • http://etd.ilmukomunikasi.fisip.ulm.ac.id/repository/dantdm-get-fre-robux_GM431946152.pdf
    • http://etd.ilmukomunikasi.fisip.ulm.ac.id/repository/wwwhaktutsin-2021-08-coinmasterfreespinandcoinlinkhtml-m-1_GM406889139.pdf
    • http://etd.ilmukomunikasi.fisip.ulm.ac.id/repository/minecraft-free-demo_GM479516143.pdf
    • http://etd.ilmukomunikasi.fisip.ulm.ac.id/repository/como-ser-hacker-en-counter-blox-roblox_GM431946152.pdf
    • http://etd.ilmukomunikasi.fisip.ulm.ac.id/repository/coin-master-hack-without-verification-2021_GM406889139.pdf
    • http://etd.ilmukomunikasi.fisip.ulm.ac.id/repository/how-to-hack-minecraft-pe_GM479516143.pdf
    • http://etd.ilmukomunikasi.fisip.ulm.ac.id//repository/how-to-download-minecraft-for-free_GM479516143.pdf
    • http://etd.ilmukomunikasi.fisip.ulm.ac.id//repository/how-to-play-coin-master_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003066.bin
14b9caeec7df92e19668f0e06d9ccf9e9fc4f0eae35f4cabe65f44ed3b5337d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3066 22068 bytes
font_01_sfnt_off00006124.bin
80da1b26748c0421ddbffdda9c90c0e7a8145a19b82875246f398f650b172979		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6124 18396 bytes

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