Malicious PDF — malware analysis report

Static analysis result for SHA-256 87451c2a5f6a7671…

MALICIOUS

PDF

46.3 KB Created: 2021-06-09 11:10:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 5b9fda3a5e4fb097140ad811ecf2c5ea SHA-1: 1428c8c3af0386fe2c24c606e1eddc00f91f5ff9 SHA-256: 87451c2a5f6a7671fc2a3c4da935a7a2894704ef0ec8409bbc4c0b6d4960fb3c
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 0.9748

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 https://netcdn.tw/app/835599320/how-to-get-tiktok-famous-free-game-hack PDF link annotation
    • http://library.unissula.ac.id/fk/repository/coin-master-free-coin-hack_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/how-to-hack-roblox-accounts-passwords_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/no-scam-free-robux_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/free-coin-and-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/getrobux-info_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/legit-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/minecraft-hacks-ps4_GM479516143.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/robux-cheats-for-roblox-app_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/roblox-free-body_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/rbx-robux_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/how-to-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/coin-master-mod-apk-unlimited-spin-download-free-full-version_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/how-to-get-millions-of-robux-for-free_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/free-coin-master-coins-2021_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/coin-master-free-spins-link-download-ios_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/daily-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/coin-master-tool-hack_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/free-robux-2021-no-verification_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/claim-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004ddb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4DDB 25780 bytes
SHA-256: 66f3b37f43ddddad612f20e5cc072bca2c935bc239f9a6cdcd206be09a31efdb
font_01_sfnt_off0000880d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x880D 2940 bytes
SHA-256: eb230542719c96b42e3fd8bb01e35f13ebd5f02629049da3a58e7fd7607bf48a
font_02_sfnt_off0000921d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x921D 18248 bytes
SHA-256: 9d8c9ff8f23476e9e897d50e05ba1c89fe9a64794c9c08e4c2e4cb1c87253222

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