Malicious PDF — malware analysis report

Static analysis result for SHA-256 37867751478b110d…

MALICIOUS

PDF

44.9 KB Created: 2021-06-03 23:11:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 23a69186d0754e1ffc8d93f93494db11 SHA-1: 8e99a927f2fda483e627ebee7b3ce932d3ca8cfd SHA-256: 37867751478b110dac82d09b4f178a4946e308051b0f94b990e8e1e1a0efef59
142 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure and a large number of external links, many of which are SEO-optimized PDF links. The primary URL points to a 'free game pack' which is likely a social engineering tactic to trick users into downloading malicious content. No scripts were extracted, but the presence of numerous external links and the fake CAPTCHA heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.
  • 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.online/app/406889139/free-game-pack-with-google-play-coin-master-game-hack
    • http://www.library.umbjm.ac.id/repository/coin-master-free-spins-for-iphone_GM406889139.pdf
    • http://www.library.umbjm.ac.id/repository/coin-master-free-spins-link-2021-download_GM406889139.pdf
    • http://www.library.umbjm.ac.id/repository/coin-master-free-spins-haktuts_GM406889139.pdf
    • http://www.library.umbjm.ac.id/repository/free-spins-coin-master-hack-2021_GM406889139.pdf
    • http://www.library.umbjm.ac.id/repository/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdf
    • http://www.library.umbjm.ac.id/repository/get-free-spins-coin-master-2021_GM406889139.pdf
    • http://www.library.umbjm.ac.id/repository/moonactive-coin-master-free-spins_GM406889139.pdf
    • http://www.library.umbjm.ac.id/repository/getrobux-info_GM431946152.pdf
    • http://www.library.umbjm.ac.id/repository/minecraft-dungeons-free_GM479516143.pdf
    • http://www.library.umbjm.ac.id/repository/how-to-download-minecraft-for-free-on-pc_GM479516143.pdf
    • http://www.library.umbjm.ac.id/repository/free-spins-october-28-2021-coin-master_GM406889139.pdf
    • http://www.library.umbjm.ac.id/repository/coin-master-free-spin-and-trading_GM406889139.pdf
    • http://www.library.umbjm.ac.id/repository/how-to-get-free-robux-for-real_GM431946152.pdf
    • http://www.library.umbjm.ac.id/repository/coin-master-free-spins-promo-code_GM406889139.pdf
    • http://www.library.umbjm.ac.id/repository/minecraft-server-hacks_GM479516143.pdf
    • http://www.library.umbjm.ac.id/repository/coin-master-hack-spins-android_GM406889139.pdf
    • http://www.library.umbjm.ac.id/repository/how-to-get-minecraft-for-free-on-your-phone_GM479516143.pdf
    • http://www.library.umbjm.ac.id/repository/instagram-free-coin-master-spins_GM406889139.pdf
    • http://www.library.umbjm.ac.id/repository/how-to-hack-in-roblox-prison-life_GM431946152.pdf
    • http://www.library.umbjm.ac.id/repository/minecraft-windows-10-edition-hacks_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000051dc.bin
a20b77d40239e0c1a7a77aa9166994202f8d289963c63c49bf6bd7068ffd7ee4		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51DC 24720 bytes
font_01_sfnt_off00008a64.bin
be98b09ab2c06fbf73b0f12808a7bd14d726d15742b97e619ffca2063d62e21c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A64 19200 bytes

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