Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b730bc2d1676d13…

MALICIOUS

PDF

53.8 KB Created: 2021-06-11 13:05:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: c4f75ee23a7415588ec0fffd91dd2ab2 SHA-1: e1bc197a69d69fca5e2a0d3f692146dbab0c7692 SHA-256: 9b730bc2d1676d132e1b810a9eac09c023790af40206d1e6ed9f057209eccf1a
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 0.9491

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/free-roblox-app-game-hack PDF link annotation
    • http://elibrary.uniyap.ac.id/repository/wahoo-roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/roblox-hacked-version-download-apk_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/free-robux-giveaway-no-human-verification_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/hacking-roblox-with-code-noclip_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/how-to-get-rainbow-wings-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/download-hack-roblox-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/roblox-free-robux-no-scam_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/roblox-how-to-get-unlimited-free-robux-and-obc_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/how-to-get-free-robux-on-roblox-on-ipad-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/apps-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/roblox-hacks-instaler_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/get-free-robux-gg_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/roblox-ghost-hack-download-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/free-game-for-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/free-roblox-accounts-2021-may_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/roblox-scripts-free_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/how-to-get-free-robux-2021-kazok_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/robux-hack-downlaod_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/how-to-get-free-gems-on-royale-high-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/roblox-studio-free-online_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000501c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x501C 33124 bytes
SHA-256: 7b35cf253406214694b42b3876b111213163f987c7ec6b59bb09fd8a42a12c31
font_01_sfnt_off00009940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9940 2820 bytes
SHA-256: 972979c3a46100cf5f8fd289bc6fbd2496ff75fec0e3f6753648c72ec6eba714
font_02_sfnt_off0000a2db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA2DB 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_03_sfnt_off0000afed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFED 18124 bytes
SHA-256: b55918b8480f66a9a053d61f951430dbcd2a64ad9c4d9286342bad064f4e5d72

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