Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc9be0cf723aedee…

MALICIOUS

PDF

44.1 KB Created: 2021-05-15 15:30:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 6fae4091cd93d27d89bc4ad115eeac23 SHA-1: 9be6d54df5c1fbee7411cfd8e76ba0b562eac201 SHA-256: dc9be0cf723aedeefbdf1dc3a4c1c8cc42bb4592eca2c1e156bae9387d6a3dd0
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses a fake-CAPTCHA lure. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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/431946152/free-robux-com-roblox-game-hack PDF link annotation
    • http://lib.unwahas.ac.id/repository/no-verification-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://lib.unwahas.ac.id/repository/apps-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.unwahas.ac.id/repository/best-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://lib.unwahas.ac.id/repository/games-like-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.unwahas.ac.id/repository/coin-master-free-spins-hack_GM406889139.pdfIn PDF document text
    • http://lib.unwahas.ac.id/repository/wwwcoin-master-hack-game-download_GM406889139.pdfIn PDF document text
    • http://lib.unwahas.ac.id/repository/watch-videos-for-robux_GM431946152.pdfIn PDF document text
    • http://lib.unwahas.ac.id/repository/coin-master-daily-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.unwahas.ac.id/repository/coin-master-spins-hack-2021_GM406889139.pdfIn PDF document text
    • http://lib.unwahas.ac.id/repository/minecraft-pe-free-download-android_GM479516143.pdfIn PDF document text
    • http://lib.unwahas.ac.id/repository/master-coin-free-spin_GM406889139.pdfIn PDF document text
    • http://lib.unwahas.ac.id/repository/lastrick-com-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://lib.unwahas.ac.id/repository/coin-master-free-400-spin-link_GM406889139.pdfIn PDF document text
    • http://lib.unwahas.ac.id/repository/how-to-get-free-robux-without-verifying-2021_GM431946152.pdfIn PDF document text
    • http://lib.unwahas.ac.id/repository/collect-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.unwahas.ac.id/repository/free-coin-master-links_GM406889139.pdfIn PDF document text
    • http://lib.unwahas.ac.id/repository/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://lib.unwahas.ac.id/repository/spins-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.unwahas.ac.id/repository/coin-master-free-pet-food-links_GM406889139.pdfIn PDF document text
    • http://lib.unwahas.ac.id/repository/hacks-for-minecraft-bedrock_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_off00004bf7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BF7 26252 bytes
SHA-256: 81aacd04a565646dc3de1e73e4d0ee44d747e09fb215cc0fc2ddf6662fbe176b
font_01_sfnt_off000089ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89EE 18348 bytes
SHA-256: 0a91f6cfdfc59c313b80ddaaf1db47d93b267e297f9a4be9f2abca10b90eba79

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