Malicious PDF — malware analysis report

Static analysis result for SHA-256 99f4b39a427aa8cc…

MALICIOUS

PDF

44.6 KB Created: 2021-06-03 06:37:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 2e7239ff3efc66c1860245a64ae944c4 SHA-1: 49478caf8de94cd90cbe49def0096f9947045f09 SHA-256: 99f4b39a427aa8cca7620e72d318ba90e8998aed15c26c9d31da7e2309bb4bb2
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to known malicious infrastructure, specifically promoting 'free generator' or 'game hack' lures. The primary redirect URL is https://netcdn.online/app/431946152/how-to-login-to-roblox-for-free-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded links strongly indicate a social engineering attack aimed at tricking users into visiting malicious sites, 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/how-to-login-to-roblox-for-free-game-hack In PDF document text
    • http://perpus.stfm.ac.id/repository/roblox-pink-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/coin-master-free-spins-for-today_GM406889139.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/coin-master-free-spins-no-survey_GM406889139.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/minecraft-apk-free-download-016-0_GM479516143.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/free-roblox-clothes-codes_GM431946152.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/coin-master-hack-no-download_GM406889139.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/minecraft-bedrock-free-server-hosting_GM479516143.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/roblox-promo-code-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/roblox-game-free-download_GM431946152.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/how-to-add-mods-to-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/free-robux-place_GM431946152.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/free-robux-please_GM431946152.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/card-hack-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/minecraft-wurst-hacked-client_GM479516143.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/coin-master-apk-free-download_GM406889139.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/how-to-hack-someones-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/how-to-download-minecraft-for-free-on-windows-10_GM479516143.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/aimbot-exe-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/coin-master-hacks-that-actually-work_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_004_off00004eef.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4EEF 26088 bytes
SHA-256: 1e24bd0413bedc1865a2db09709ec3e975c2f9f26bc09554eec9e409de5b99bd
font_01_sfnt_off00008b1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B1C 18520 bytes
SHA-256: 831da0cfa09755c2442ff94b9d9ad3ab8df05d4d5d37381f9b24912a58f8bdfb

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