Malicious PDF — malware analysis report

Static analysis result for SHA-256 695a936b8eb28c40…

MALICIOUS

PDF

41.3 KB Created: 2021-05-12 21:11:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 0bbfb562b3c0f2cea9a8c1f23fe8b4da SHA-1: c4abb72bf7a0d7832b58a098e04860bc524586af SHA-256: 695a936b8eb28c40e5012c66305edbd5501a8214c73941fdbe5486be1b90a03f
200 Risk Score

Malware Insights

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

This PDF document employs a fake CAPTCHA lure to deceive users into interacting with malicious links, specifically promoting 'Coin Master' hacks. The embedded URLs, such as https://netcdn.xyz/app/406889139/coin-master-hack-https-coinms-net-game-hack, are associated with known malicious redirector infrastructure. While no scripts were directly extracted, the PDF structure and heuristics suggest an attempt to exploit user interaction for redirection to potentially malicious sites or further downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than 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
  • 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/coin-master-hack-https-coinms-net-game-hack In PDF document text
    • http://biblioteca.ganexa.edu.pa/repository/coin-master-hack-twitter_GM406889139.pdfIn PDF document text
    • http://biblioteca.ganexa.edu.pa/repository/coin-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://biblioteca.ganexa.edu.pa/repository/coin-master-hack-apk-android-1_GM406889139.pdfIn PDF document text
    • http://biblioteca.ganexa.edu.pa/repository/roblox-hacks-com_GM431946152.pdfIn PDF document text
    • http://biblioteca.ganexa.edu.pa/repository/coin-master-hacks-xyz_GM406889139.pdfIn PDF document text
    • http://biblioteca.ganexa.edu.pa/repository/coin-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://biblioteca.ganexa.edu.pa/repository/robux-premium_GM431946152.pdfIn PDF document text
    • http://biblioteca.ganexa.edu.pa/repository/haktuts-coin-master_GM406889139.pdfIn PDF document text
    • http://biblioteca.ganexa.edu.pa/repository/free-spin-coin-master-hacktoman_GM406889139.pdfIn PDF document text
    • http://biblioteca.ganexa.edu.pa/repository/free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://biblioteca.ganexa.edu.pa/repository/coin-master-game-hack-kaise-kare_GM406889139.pdfIn PDF document text
    • http://biblioteca.ganexa.edu.pa/repository/boost9-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://biblioteca.ganexa.edu.pa/repository/minecraft-apk-download-free-11-055_GM479516143.pdfIn PDF document text
    • http://biblioteca.ganexa.edu.pa/repository/coin-master-sound-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://biblioteca.ganexa.edu.pa/repository/links-to-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://biblioteca.ganexa.edu.pa/repository/robuxmatchcon_GM431946152.pdfIn PDF document text
    • http://biblioteca.ganexa.edu.pa/repository/free-links-for-coin-master_GM406889139.pdfIn PDF document text
    • http://biblioteca.ganexa.edu.pa/repository/roblox-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://biblioteca.ganexa.edu.pa/repository/xray-hack_GM479516143.pdfIn PDF document text
    • http://biblioteca.ganexa.edu.pa/repository/free-roblox-outfits-2021_GM431946152.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_off0000477f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x477F 24680 bytes
SHA-256: a70522cc249af9970d3d9bf5546025a67cde5703c079ed598c21c8433fab9271
font_01_sfnt_off00007f49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F49 18152 bytes
SHA-256: 98ac4e66809d5f1f5b8246c3389f99af71150df64b93ee4f4ebb1a2fd2e53783

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