Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfcbbe56e79cffd7…

MALICIOUS

PDF

41.7 KB Created: 2021-05-16 20:05:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 9e56a9b20b8a31d35adfba4142497983 SHA-1: c628476063ab273144f75601836d45b22c833ed9 SHA-256: cfcbbe56e79cffd7db1007ed87fb58ff4780db9a21988fd9a2081cc6e618c5c6
82 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA to trick the user into interacting with it, likely to initiate a download. The embedded URL, https://netcdn.xyz/app/406889139/free-coins-and-spins-for-coin-master-game-game-hack, is highly suspicious and likely serves as the download source for a secondary payload. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 4

  • 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 https://netcdn.xyz/app/406889139/free-coins-and-spins-for-coin-master-game-game-hack PDF link annotation
    • http://www.lrnetwork.es/images/free-roblox-cards-pin-number_GM431946152.pdfIn PDF document text
    • http://www.lrnetwork.es/images/mc-update_GM479516143.pdfIn PDF document text
    • http://www.lrnetwork.es/images/coin-master-free-spins-link-31-march-2021_GM406889139.pdfIn PDF document text
    • http://www.lrnetwork.es/images/minecraft-redeem-code-free-2021_GM479516143.pdfIn PDF document text
    • http://www.lrnetwork.es/images/roblox-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://www.lrnetwork.es/images/roblox-weird_GM431946152.pdfIn PDF document text
    • http://www.lrnetwork.es/images/free-robux-hack-us_GM431946152.pdfIn PDF document text
    • http://www.lrnetwork.es/images/cm-daily-spins_GM406889139.pdfIn PDF document text
    • http://www.lrnetwork.es/images/open-coin-master_GM406889139.pdfIn PDF document text
    • http://www.lrnetwork.es/images/rbx-robux_GM431946152.pdfIn PDF document text
    • http://www.lrnetwork.es/images/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.lrnetwork.es/images/free-headless-head-roblox_GM431946152.pdfIn PDF document text
    • http://www.lrnetwork.es/images/how-to-host-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://www.lrnetwork.es/images/free-spins-coin-master-march-2021_GM406889139.pdfIn PDF document text
    • http://www.lrnetwork.es/images/free-daily-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.lrnetwork.es/images/coin-master-hack-online-pc_GM406889139.pdfIn PDF document text
    • http://www.lrnetwork.es/images/coin-master-rewards-app_GM406889139.pdfIn PDF document text
    • http://www.lrnetwork.es/images/roblox-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.lrnetwork.es/images/actual-free-robux_GM431946152.pdfIn PDF document text
    • http://www.lrnetwork.es/images/how-to-get-minecraft-java-free_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004930.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4930 24168 bytes
SHA-256: f7a62b6da9db604536f9c0efbf7cb735c8e4bba37e9b570da2e25d551326c71b
font_01_sfnt_off00008072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8072 18320 bytes
SHA-256: 2c95db8d02702652075be8f6568e083e0c31fb28563b2fbbcaccc1dd0c48c672

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