Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d6500964116e779…

MALICIOUS

PDF

36.0 KB Created: 2021-07-04 13:00:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 9a2c03e831c2bf7dab74559b407329b3 SHA-1: be9bddad243dabe19c71b65e9843e964a924f58d SHA-256: 6d6500964116e779cbdadbcc0609c42f1d15788a5cb1043c8393286fd03cb4c9
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'free generators' and 'hacks' for popular games. The primary redirector URL is http://netcdn.tw/app/406889139/coin-master-apk-mod-free-download-game-hack. This lure is designed to trick users into downloading potentially unwanted applications or malware. No scripts were extracted, but the embedded URLs and heuristic firings strongly indicate a social engineering attack.

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/406889139/coin-master-apk-mod-free-download-game-hack In PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/how-to-get-a-free-minecraft-server_GM479516143.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/how-do-you-hack-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/roblox-free-terminated-accounts_GM431946152.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/roblox-april-fools-hack_GM431946152.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/hack-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/minecraft-tiktok-hacks_GM479516143.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/free-robux-generator-no-human-verification-or-surveys_GM431946152.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/roblox-bloxburg-hack_GM431946152.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/free-robux-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/roblox-legend-of-the-fallen-kingdom-2-rpg-cheats_GM431946152.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/hack-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/free-robux-with-no-survey_GM431946152.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/free-spin-coin-master-app-download_GM406889139.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/minecraft-app-store-free_GM479516143.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/how-to-get-a-tiger-free-shard-seekers-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/free-roblox-clothes-girl_GM431946152.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/how-to-download-minecraft-windows-10-edition-for-free_GM479516143.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/free-spin-link_GM406889139.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/apps-for-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.kedokteran.ump.ac.id/index/repository/minecraft-mojang-free_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_002_off00003179.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3179 23940 bytes
SHA-256: 12e9b4b8333bea94ae0c227501832d19595216984148a4ba9a503a41488d9934
font_01_sfnt_off0000681c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x681C 18924 bytes
SHA-256: 1ed4fdd55e79db35ba5a6932ee426d6643a4d572caee5ee8ddb17c2f91f1361b

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