Malicious PDF — malware analysis report

Static analysis result for SHA-256 9db71dfba1b7f398…

MALICIOUS

PDF

46.1 KB Created: 2021-06-03 13:44:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 1ad58ec6ab3b6b7f084144abe82f3c67 SHA-1: 77ad94096b9fb68cee651630166c76b1bfc9bbdd SHA-256: 9db71dfba1b7f398ef820f1ad51d32c4ff4383c35ac1dc75894c0151d6e6c70b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically advertising 'free generators' and 'game hacks' for popular games. The ML classifier also flagged this PDF as malicious with high confidence. The embedded URL leads to a redirector that likely serves a second-stage payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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/inappropriate-roblox-games-game-hack In PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-free-spins-hack_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/como-hackear-juego-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/como-hackear-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-roblox-accounts-with-robux_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-role-in-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-golden-cards-hack_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-coins-free_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/earn-roblox_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-robux-no-human-verification-and-no-survey_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/flip-master-free-coins_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-daily-free-spin-app_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/minecraft-svg-free_GM479516143.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-get-free-robux-no-survey_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-free-spins-usa-2021_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-do-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/real-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-modded-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/minecraft-free-download-pc_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
stream_004_off00005188.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5188 26768 bytes
SHA-256: bd7b87921a5ed5701e799efcf43068e17e01186b8d08cd08bf0aa62dfddfb604
font_01_sfnt_off00009078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9078 18672 bytes
SHA-256: a34fe5295dcc4db89ba058eb4e8b801f8f691b08aa214e128da072cc58f05ab1

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