Malicious PDF — malware analysis report

Static analysis result for SHA-256 77c2a72f4de18efe…

MALICIOUS

PDF

33.4 KB Created: 2021-07-05 14:42:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 1fb5ba2a01b7034a1c3dcdbd24605318 SHA-1: c43b2033e059899904194176f388a07ee7cbf48e SHA-256: 77c2a72f4de18efe3e514106608382e73490e52c1910dce0ac15e0dd95adb875
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/479516143/minecraft-pe-apk-game-hack PDF link annotation
    • http://elibrary.perludem.org/repository/coin-master-hack-account_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-roblox-pants-girl_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/roblox-free-builders-club-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/coin-master-free-cards-2021_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/coin-master-free-spins-link-2021-march_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/coin-master-hack-unlimited-spins-and-coins-cheats_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/roblox-games-where-you-can-play-music-for-free_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/games-for-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/games-that-can-be-hacked_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/hack-de-roblox-2021-diciembre_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/how-to-use-redstone_GM479516143.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/roblox-money-cheats-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/free-roblox-accounts-with-robux-2021-august_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/hacks-for-sailing-roblox_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/coin-master-hack-spin-generator-tool_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/getbucks-free-roblox-website-game_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/free-robux-please_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-robux-without-human-verification-and-password_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/hack-coin-master-for-android_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-robux-cards-codes-november-22nd-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_off00002f2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F2D 21980 bytes
SHA-256: 83932f78275d498987871ccd0d1068ddc703474fefd31a961bc64af1d3995723
font_01_sfnt_off00005fb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FB3 18356 bytes
SHA-256: be91706a5984af6f52632c5b435120e4fc5e0e81192531de8d8fc3d36aaddc1b

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