Malicious PDF — malware analysis report

Static analysis result for SHA-256 a107f504fe31e79a…

MALICIOUS

PDF

45.4 KB Created: 2021-06-08 18:16:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 73c869c2f427b770545d2882dad80f41 SHA-1: 8ea6883cce325e280f208beae0a0066c1067da81 SHA-256: a107f504fe31e79a0506572e48ef2f945f97c4d6ed97cbf85768fc311a96d657
122 Risk Score

Malware Insights

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

The PDF file contains a high-confidence heuristic indicating a fake CAPTCHA or human verification prompt, designed to trick users into interacting with malicious content. It also links to a game hack generator website, suggesting a social engineering lure. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.tw/app/431946152/roblox-cheat-engine-forcefield-game-hack PDF link annotation
    • http://uilis.unsyiah.ac.id/ebook/repository/simplysarc_GM479516143.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/coin-master-cheats_GM406889139.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/win-free-robux_GM431946152.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/worst-roblox-avatars_GM431946152.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/coin-master-hack-using-cheat-engine_GM406889139.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/free-minecraft-codes_GM479516143.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/spins-gratis-coin-master-hoy_GM406889139.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/woman-roblox_GM431946152.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/tiktok-free-like-and-followers-apk_GM835599320.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/roblox-rewards_GM431946152.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/coin-master-2021-free-spins-link_GM406889139.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/how-can-you-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/roblox-free-hair-boy_GM431946152.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/june-29-coin-master-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/free-coin-master-cards_GM406889139.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/coin-master-free-spins-apk-2021_GM406889139.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • http://uilis.unsyiah.ac.id/ebook/repository/wurst-client-18-9_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_004_off00005145.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5145 25852 bytes
SHA-256: 396f5de3d07996e6b03ac1a85258275c9313425e78599e4f6818e63003ab5df1
font_01_sfnt_off00008c8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C8E 19028 bytes
SHA-256: c1c2bfefe75cab58a5c3e30d464bcccba43d52f6cdf66ac5ff9c82c97b0b18cf

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