Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5a0bf04688304b4…

MALICIOUS

PDF

43.6 KB Created: 2021-05-10 13:31:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 20fbbf85097a81a35d571f8814c4a604 SHA-1: 51768386f6fe357b439ee54a9c95ad4b4058fdaa SHA-256: b5a0bf04688304b41c7d56c33bcdf0c53d794f958fa5f262490c87f92620625a
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating malicious redirector links, specifically targeting users with lures for game hacks and free spins. The document body, though heavily obfuscated, contains a URL that aligns with these lures. The presence of embedded URLs and the ML classifier's high confidence score suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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.xyz/app/406889139/how-to-get-free-spins-on-coin-master-without-verification-game-hack In PDF document text
    • http://library.unissula.ac.id/fk/repository/coin-master-daily-free-spins-link-app_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/minecraft-app-free-download_GM479516143.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/how-to-get-free-robux-2021-easy_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/coin-master-time-speed-hack_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/freerobux-co_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/coin-master-hack-apk-2021_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/coin-master-hack-spin_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/free-executor-roblox_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/how-do-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/coin-master-15-free-spin-link-of-last-5-days_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/get-me-robux-for-free_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/minecraft-apk-download-v1-144-2-free_GM479516143.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/wurst-client_GM479516143.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/free-robux-youtube_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/free-robux-codes-2021-real_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/lazyblocks-com-free-robux_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/coin-master-free-spin-link-today-16-11-2021_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/coin-master-spin-link-hack_GM406889139.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_003_off00004a67.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A67 26340 bytes
SHA-256: 1b64ccab1fc9c2e5fc18d48c964a1a227fc1b65002e35ac66e0013cfed9fb5f0
font_01_sfnt_off00008703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8703 18688 bytes
SHA-256: 34013a01fc9b19de026014672642da8d02f9cc4163dada898040bd77c253fb22

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