Malicious PDF — malware analysis report

Static analysis result for SHA-256 81387b17a41144a5…

MALICIOUS

PDF

34.9 KB Created: 2021-07-05 20:00:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 9688d03e101e9b71711181b4c2077c1b SHA-1: fe77e3871a907f3ca9c13e825ddcf3419fa7f16d SHA-256: 81387b17a41144a5a8319311a243ffa6668e7f2b0342fbfa5c10c0d23fdd25a3
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. It uses a password-protected-archive 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 0.9980

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://netcdn.tw/app/431946152/https-oprewards-com-roblox-game-hack PDF link annotation
    • https://library.institutpendidikan.ac.id/repository/minecraft-java-free_GM479516143.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/coin-master-hack-programers_GM406889139.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/free-robux-hacker-us_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/hwo-to-get-free-robux-with-out-password-or-hacking_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/20210-robux-promo-code-free_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/hack-coin-master-xyz_GM406889139.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/8bp-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/intro-roblox-free_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/minecraft-classic-free_GM479516143.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/how-to-get-free-stuff-for-your-avatar-in-roblox_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/free-robux-generator-no-human-verification-real_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/seven-v2-roblox-free-download_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/pastebin-roblox-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/mcpe-master-hack-unlimited-coins-apk_GM406889139.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/cheats-for-city-arcatect-roblox_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/free-spins-and-coins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/paypal-roblox-hack_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/free-spins-and-coins-from-coin-master-game_GM406889139.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/roblox-ban-account-hack_GM431946152.pdfIn PDF document text
    • https://library.institutpendidikan.ac.id/repository/how-to-get-free-robux-no-hack-or-download-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
font_00_sfnt_off000031a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31A8 22172 bytes
SHA-256: 6de5eaf18a16926c93c0a0cd04de8420d1cf20e1a588b38e3cf15b41240905c6
font_01_sfnt_off00006260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6260 19364 bytes
SHA-256: 5a5caa3ea5a7450f5ada42000dea20375fa148f76b5cf036c4c04236d009ba0c

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