Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e8c733cbe049018…

MALICIOUS

PDF

45.6 KB Created: 2021-06-03 07:14:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 6b87bf261c0a00db128e2bb615c7fdfc SHA-1: 6dbba824a86fec01db109e91f3d68f7743616e3c SHA-256: 4e8c733cbe04901855f746df040f71354c77f28d3f8db544114db3153f743687
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, specifically advertising 'free generators' and 'game hacks'. The primary lure URL is https://netcdn.online/app/431946152/get-free-robux-game-hack. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to trick users into navigating to malicious infrastructure, likely for malware distribution.

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/get-free-robux-game-hack In PDF document text
    • http://www.perpustakaan.smansa-bdl.sch.id/repository/rape-simulator_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.smansa-bdl.sch.id/repository/free-spins-coin-master-october-17-2021_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.smansa-bdl.sch.id//repository/hacks-para-roblox_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.smansa-bdl.sch.id/repository/minecraft-windows-10-free_GM479516143.pdfIn PDF document text
    • http://www.perpustakaan.smansa-bdl.sch.id//repository/how-to-change-roblox-username-for-free-2021_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.smansa-bdl.sch.id//repository/free-roblox-girl-clothes_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.smansa-bdl.sch.id/repository/oprewards-robux_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.smansa-bdl.sch.id//repository/minecraft-hacked-apk_GM479516143.pdfIn PDF document text
    • http://www.perpustakaan.smansa-bdl.sch.id/repository/pokemon-go-free-1km-buddy_GM1094591345.pdfIn PDF document text
    • http://www.perpustakaan.smansa-bdl.sch.id//repository/tower-of-hell-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.smansa-bdl.sch.id//repository/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.smansa-bdl.sch.id//repository/free-robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.smansa-bdl.sch.id//repository/how-to-use-wurst_GM479516143.pdfIn PDF document text
    • http://www.perpustakaan.smansa-bdl.sch.id//repository/coin-master-apk-hack-2021_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.smansa-bdl.sch.id/repository/roblox-hack-tool_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.smansa-bdl.sch.id//repository/free-robux-promo-codes-2021_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.smansa-bdl.sch.id//repository/pubg-uc-rate-in-pakistan_GM1330123889.pdfIn PDF document text
    • http://www.perpustakaan.smansa-bdl.sch.id//repository/pubg-uc-dealer_GM1330123889.pdfIn PDF document text
    • http://www.perpustakaan.smansa-bdl.sch.id//repository/100-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.smansa-bdl.sch.id//repository/coin-master-hack-spin_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_off00005228.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5228 26620 bytes
SHA-256: 4bcd555cc63f4ff64d222eb96ce920f7e9e28d29b98329b6ae9482ed82ddad98
font_01_sfnt_off0000905a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x905A 18120 bytes
SHA-256: 79ac164380d838bf2943c127f808202d45f8751c05dbd036140e6fb9b1b49848

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