Malicious PDF — malware analysis report

Static analysis result for SHA-256 cff990fd3e15c5ee…

MALICIOUS

PDF

48.9 KB Created: 2021-06-03 14:28:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: bcbf582d817f95136dd3c649564974ba SHA-1: edb6e90c23da9e106ae694beced4a3a68e6746fd SHA-256: cff990fd3e15c5eea8d1b3ef25ae1be26abd4462642371a993a7f4f3a3662d10
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to a malicious domain, masquerading as a game hack generator. The ML classifier also flagged this PDF as malicious. The primary malicious activity observed is the redirection to a known malicious URL, likely intended to deliver a secondary payload or phish for credentials.

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/406889139/100-free-spins-coin-master-game-hack In PDF document text
    • http://digilib.uim.ac.id/repository/how-to-get-minecraft-windows-10-for-free-2021_GM479516143.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-robux-come_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-unlimited-coin-master-online-tool_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/coin-master-free-spins-and-coins-hack_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/daily-free-spin-coin-master-link_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/best-site-for-free-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-minecraft-education-edition_GM479516143.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/roblox-hacked-accounts-list_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/strucid-aimbot_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/coin-master-spin-hack_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/descargar-coin-master-hackeado_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/getrobux-come_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-roblox-wings_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/how-to-hack-people-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/classic-minecraft-net-hacks_GM479516143.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-robux-no-verify_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/hack-coin-master-using-pc_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/are-robux-generators-safe_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/roblox-data-breach_GM431946152.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_off00004f9f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F9F 24760 bytes
SHA-256: 3504909c3e8733e75c48dd82eae8bad950978e2c30db9d5a441af964694325bb
font_01_sfnt_off00008844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8844 8676 bytes
SHA-256: e06aca5f85e50ae6cefda302c5299c18ab6d27c174f74f0bb0ee8efa7ccb4468
font_02_sfnt_off00009ccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9CCF 18164 bytes
SHA-256: 9bc61af2acbda784231945e40c4a4bb5d6810b0d04641be6b37b2cdd3c5b78bc

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