Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a9e82c8aae49873…

MALICIOUS

PDF

33.8 KB Created: 2021-07-05 04:29:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: e1bccf1d71c4edbd76352209a001d53d SHA-1: e2bb2c124bf0aafa6f1e8db732589bb44eedea63 SHA-256: 8a9e82c8aae49873f593ddc75b919daab7dcfc7e305a82b99d82cef98797753f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and lures users with game-related cheats. The primary malicious URL identified is http://netcdn.tw/app/479516143/how-to-hack-a-minecraft-server-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly indicate a social engineering attack designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/479516143/how-to-hack-a-minecraft-server-game-hack In PDF document text
    • https://perpus.upp.ac.id/digilib/repository/coin-master-hack-apk-no-survey_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/roblox-studio-free-download-android_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/robux-generator-without-human-verification_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/how-to-hack-the-roblox-piano_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/get-me-free-robux_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/coin-master-hacks-2021_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/how-to-earn-robux-by-playing-games_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/free-coin-and-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/easy-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/how-to-get-free-robux-very-easy_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/10-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/how-do-we-get-free-robux_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/coin-master-free-spins-haktuts_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/hacking-roblox-accounts-passwords_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/link-for-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/free-spin-link-coin-master-today_GM406889139.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/collect-robux_GM431946152.pdfIn PDF document text
    • https://perpus.upp.ac.id/digilib/repository/spin-coin-master-free_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
font_00_sfnt_off00003163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3163 21688 bytes
SHA-256: 69aa2d698b0aa6790ee426d4d4f6451721b74abbef3596ac0a016a6cc65873fd
font_01_sfnt_off000060da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60DA 18448 bytes
SHA-256: f1c94bc02981aac760cf80effac2d7fab2917855e343fbf4fd70c93d36576a9e

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