Malicious PDF — malware analysis report

Static analysis result for SHA-256 636797827ba3ec5b…

MALICIOUS

PDF

45.4 KB Created: 2021-06-03 07:53:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: f4e355b865bb556c6e44d9c9e632be08 SHA-1: f82c134c4e883c581d4deccdbc2bed7267cc41fe SHA-256: 636797827ba3ec5ba1ce5c464b8b6ed72b826b1e73393900826be0e9b1bfb4e1
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains multiple embedded links that redirect to malicious infrastructure, specifically promoting game hacks and generators. The heuristic firings indicate that these links are associated with known malicious redirectors and a lure for game-related cheats. While no scripts were explicitly extracted, the nature of the embedded links and the PDF structure suggests an attempt to exploit vulnerabilities or trick the user into downloading a secondary payload, likely through a client-side exploit or a malicious redirect.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

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/406889139/hack-mod-coin-master-game-hack In PDF document text
    • http://digilib.unbari.ac.id/repository/free-robux-redeem-codes-2021_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/free-spins-on-coin-master-link_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/lastrick-com-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/free-robux-card-codes_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/roblox-booga-booga-hack_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/minecraft-java-edition-free-trial_GM479516143.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/minecraft-windows-10-hacked-client_GM479516143.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/roblox-adopt-me-hacks-2021_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/minecraft-creative-mode-free_GM479516143.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/coin-master-free-spins-and-coins-app_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/roblox-svg-free_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/free-spin-link-coin-master-today_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/how-to-get-free-robux-no-scam_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/coin-master-free-spins-hack-ios_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/wahoogaming-co-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/coin-master-hack-no-verification-no-signup_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/free-robux-obby_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_off00004f99.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F99 23932 bytes
SHA-256: a71bc2fbd915c1e4ac705e5a037d1306893d3e8fddeb022d06c28ae54d8c5fdf
font_01_sfnt_off000085d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85D9 2896 bytes
SHA-256: 98478e2fbfabd582329b6206c0d46f67523cf5e299cb16118f1065b4dd5ec6a6
font_02_sfnt_off00008fc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FC0 17888 bytes
SHA-256: dc32a61c9c56a2d6254cf5e96f3d19af1ec49db8cb541dbe33886e0eb1c1ed15

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