Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8f791fbf31330f7…

MALICIOUS

PDF

43.4 KB Created: 2021-06-09 09:04:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 0804da192c853a50c145594f3fb284df SHA-1: 05ee99b03015a1ff618371bd5133042dfbb7a262 SHA-256: c8f791fbf31330f74ea3aa70d9a7f4adbd471d5078e892dde460eefe14fde4ff
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains embedded links that redirect to malicious infrastructure, specifically promoting 'game hacks' and generators. The presence of a visual download button and the ML classifier's high confidence score indicate a deliberate attempt to deceive the user. While no scripts were directly extracted, the document's structure and embedded URLs strongly suggest it's designed to lead the user to a malicious site, likely for further exploitation or 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.tw/app/431946152/hack-bloxburg-roblox-game-hack In PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/how-to-get-free-roebucks-in-roblox_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/free-rixty-codes-for-roblox-2021_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/coin-master-free-daily-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/free-tiktok-25-likes_GM835599320.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/free-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/easy-robux-today-com_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/minecraft-items_GM479516143.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/minecraft-hacks-xbox_GM479516143.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/roblox-com-r_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/sites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/free-robux-generator-without-human-verification_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/wwwcoin-master-free-spincom_GM406889139.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/how-to-get-free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/rbx-roblox_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/get-free-robux-info_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/roblox-skin-free_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/how-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://opac.disarpus.surakarta.go.id/repository/daily-coin-master-free-spins_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_off00004d32.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D32 24652 bytes
SHA-256: 7d521ba693465df5c489b3e7a4988787ada12468e9f66218886b19b27370ca02
font_01_sfnt_off000085c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85C2 18612 bytes
SHA-256: c5e3d67a69c7ff8eeb1475753a683a9eb9f1273da6c4cb331b0274966bea177f

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