Malicious PDF — malware analysis report

Static analysis result for SHA-256 e213c536f214d7d6…

MALICIOUS

PDF

35.5 KB Created: 2021-07-07 06:05:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 082b16ee3674545c4d3e4cf9fec6f4bc SHA-1: 4e1fd1b2ef83730213f7f3f7c18eca0f4c9ff1ee SHA-256: e213c536f214d7d6f88e564bda0f399f8347e5a8024e65dd86d368ddf5df784c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs that redirect to malicious infrastructure, specifically targeting users interested in game hacks and generators. The ML classifier strongly flagged this PDF as malicious, and the presence of redirector links indicates a phishing or scam attempt. No scripts were extracted, but the document's structure and embedded links are indicative of a lure to a malicious site.

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/431946152/assassin-roblox-download-hack-game-hack In PDF document text
    • http://fkunismuh.org/perpustakaan//repository/robux-generator-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/free-spins-for-coin-master-without-human-verification_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/free-robux-no-verification-2021-ios_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/coin-master-hack-tool-v1-9-download-free-pc_GM406889139.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/robux-pastebin-hack-2021_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/master-coin-free-spin-daily_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/minecraft-esp_GM479516143.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/free-robux-websites-2021_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/how-to-get-free-hats-in-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/how-to-get-free-gamepass-roblox_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/google-roblox-items-free_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/hacking-pokemon-reborn-roblox_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/coin-master-free-spins-and-coins-group_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/coin-master-free-spins-no-generator_GM406889139.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/coin-master-free-spins-hack-iphone_GM406889139.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/coin-master-60-spins_GM406889139.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/phoenix-signs-hack-roblox-account_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/i-want-free-robux_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/como-descargar-hack-en-roblox_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/minecraft-ps3-free-download_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_off0000309f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x309F 23432 bytes
SHA-256: 27ed009725809fbaf2bc4d9bbfcf71b20bef1862d4351c16c3efc744ead0e62e
font_01_sfnt_off0000659a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x659A 19096 bytes
SHA-256: 7c65249974b1a3d9b483ebde919f94462b4d77151e589eb0d353f1af6edc3897

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