Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bc863bc34721e18…

MALICIOUS

PDF

48.1 KB Created: 2021-06-03 13:31:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: acb4425897ede0c49b57e133a94e869d SHA-1: 56aa58ce3663099e4c01e289b293064c2d0690e0 SHA-256: 8bc863bc34721e18481cff4a01b2fecc5aae81d0d6ef19f46a1d96cdb40e0c7c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains multiple links to known malicious redirectors, specifically promoting 'free generator' or 'game hack' lures. The primary malicious URL identified is https://netcdn.online/app/406889139/free-spin-coin-master-ios-game-hack. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a phishing or social engineering attack aimed at redirecting users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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/free-spin-coin-master-ios-game-hack In PDF document text
    • http://perpustakaan.ftk.uinib.ac.id//repository/free-spins-coin-master-apple_GM406889139.pdfIn PDF document text
    • http://perpustakaan.ftk.uinib.ac.id/repository/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
    • http://perpustakaan.ftk.uinib.ac.id/repository/coin-master-hack-tool_GM406889139.pdfIn PDF document text
    • http://perpustakaan.ftk.uinib.ac.id/repository/free-spins-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.ftk.uinib.ac.id//repository/free-robux-com-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ftk.uinib.ac.id//repository/free-minecraft-texture-packs-java_GM479516143.pdfIn PDF document text
    • http://perpustakaan.ftk.uinib.ac.id//repository/free-coin-spin-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.ftk.uinib.ac.id//repository/free-roblox-gfx_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ftk.uinib.ac.id//repository/spin-and-coin_GM406889139.pdfIn PDF document text
    • http://perpustakaan.ftk.uinib.ac.id/repository/gaming-dunia-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://perpustakaan.ftk.uinib.ac.id//repository/coin-master-spins-hack-iphone_GM406889139.pdfIn PDF document text
    • http://perpustakaan.ftk.uinib.ac.id//repository/with-pokemon-go-free-download_GM1094591345.pdfIn PDF document text
    • http://perpustakaan.ftk.uinib.ac.id//repository/coin-master-free-spins-generator_GM406889139.pdfIn PDF document text
    • http://perpustakaan.ftk.uinib.ac.id//repository/free-minecraft-bedrock-server_GM479516143.pdfIn PDF document text
    • http://perpustakaan.ftk.uinib.ac.id//repository/coin-master-daily-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • http://perpustakaan.ftk.uinib.ac.id//repository/no-verification-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://perpustakaan.ftk.uinib.ac.id/repository/free-coins_GM406889139.pdfIn PDF document text
    • http://perpustakaan.ftk.uinib.ac.id//repository/rewards-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ftk.uinib.ac.id//repository/coin-master-free-spins-and-free-coins_GM406889139.pdfIn PDF document text
    • http://perpustakaan.ftk.uinib.ac.id/repository/coin-master-free-2021-spin-link_GM406889139.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_off00005337.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5337 27208 bytes
SHA-256: 78f81ad31c29a138c3e5303ec48c1d1d824ebad0f9764993c8d71f7f95df0d58
font_01_sfnt_off000090f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90F9 2812 bytes
SHA-256: 869414959d7b492e0f799b560e1731e3ab498bd286c28e9f0d2ec33d9b6cf53d
font_02_sfnt_off00009a98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9A98 17884 bytes
SHA-256: 5eb2d7dbb743594663af058a86b176e9f3c663ad368d873d72479ee79bf44ad7

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