Malicious PDF — malware analysis report

Static analysis result for SHA-256 665f4a7e93fd3509…

MALICIOUS

PDF

33.8 KB Created: 2021-07-05 22:07:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 7cef2a61ffa07935df2535c86baca3b2 SHA-1: 49f0f71ab6a79887a5fa74fd31b30146de8b9763 SHA-256: 665f4a7e93fd3509f95e304b8af2d7038d60cae7bc3f3e642629c53fa968b4b3
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs that lead to a known malicious redirector infrastructure, specifically designed to lure users with promises of game hacks and currency. The document body and heuristics indicate a phishing or scam attempt, likely intended to lead users to a site that may host further malware or attempt credential harvesting. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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 http://netcdn.tw/app/431946152/how-do-you-earn-robux-game-hack In PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-make-clothes-free-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/daily-spin_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-free-500-spins-link_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-free-spins-link-no-verification-2021_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-tips_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/minecraft-pe-hacks_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-spins-in-coin-master-without-human-verification_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-free-spins-daily-2021_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/robux-hack-me_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-hack-spins-android_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-roblox-accessories_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/hacker-minecraft-song_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-hack-ios-download-2021_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-coin-and-spin-link_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/girl-roblox-avatar_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-fan-hack_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-hack-no-root_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/robux-gainer_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/minecraft-115-2-hacks_GM479516143.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_off00002dbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DBD 22196 bytes
SHA-256: 33f21359300ab5899eea08faf8f527a2d98770574e4182c1362068cada458bb2
font_01_sfnt_off00005eeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EEB 19048 bytes
SHA-256: 24e49863226dc28f9d0ab46f6a66c2a3903f06049e6c48910dd5e6d4fdc19de1

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