Malicious PDF — malware analysis report

Static analysis result for SHA-256 40aaf982dde1c439…

MALICIOUS

PDF

44.9 KB Created: 2021-06-03 14:53:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: bd53890266e098fa11712ba5ebe2761b SHA-1: fbf7aa05023f952f0f6aaa16ebfff39691d9447d SHA-256: 40aaf982dde1c439acd97d69021ca1ded565da0deacc890161d50d86c135635e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links that redirect to malicious infrastructure, specifically promoting 'free generators' and 'game hacks' for popular games. The ML classifier also flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the lures suggest an attempt to drive users to potentially malicious websites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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 https://netcdn.online/app/431946152/free-group-roblox-game-hack In PDF document text
    • http://lib.kunci.or.id/repository/minecraft-cheats-pc-2021_GM479516143.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/coin-master-free-spins-links-app_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/earn-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/cheat-codes-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/robux-xyz_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/coin-master-free-coins-and-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/coin-master-hack-2021-ios_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/roblox-studio-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/is-minecraft-dungeons-free_GM479516143.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/how-to-hack-roblox-2021_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/hack-coin-master-spin-apk_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/minecraft-cheats-switch_GM479516143.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/mcpe-com_GM479516143.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/how-to-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/how-to-get-minecraft-for-free-on-iphone_GM479516143.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/how-to-get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-robux-gen_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/master-coin-hack-mod_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/how-to-hack-into-someones-roblox-account_GM431946152.pdfIn PDF document text
    • https://www.roblox.coIn PDF document text
    • https://www.bandicam.comIn 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_off000052a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x52A5 25304 bytes
SHA-256: 203f1ef6857d4eeae5f89f1f97b0f96653ff21735b6c83037a09e8051701a4ce
font_01_sfnt_off00008d1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D1B 18264 bytes
SHA-256: 31cc93a5829e223d58b1b30bfb51d13dea7d7899258fccbb6445770557a8d4bf

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