Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6896b8138e21de9…

MALICIOUS

PDF

44.4 KB Created: 2021-06-04 03:47:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 7dc2c4af969879bf2a3e51d24c402175 SHA-1: 5eb398f138e6d2f94a1b97ecbcf6ed4cb34cfa68 SHA-256: f6896b8138e21de96c6285380862d86600c38af186a14957ce1c1e63ec6df137
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically advertising "free generator / game hack" lures. The primary malicious URL identified is https://netcdn.online/app/406889139/free-daily-spins-coin-master-game-hack. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious redirection, likely intended to lead users to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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-daily-spins-coin-master-game-hack In PDF document text
    • http://library.umla.ac.id//repository/minecraft-for-free-games_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id/repository/roblox-scam_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-hack-spins-and-coins-unlimited-free-download_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/roblox-piano-hack_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/roblox-sued_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-coins_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/sites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/pokemon-go-free-accounts-2021_GM1094591345.pdfIn PDF document text
    • http://library.umla.ac.id//repository/ww-robux_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/free-robux-gift-card-generator_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/is-minecraft-free-on-xbox_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id//repository/get-roebucks-com_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-free-cards-hack_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/free-coins-on-coin-master-without-verification_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/free-robux-without-survey_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/roblox-catalog-free_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-free-spins-hacktman_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/free-coin-master-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/update-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/minecraft-images-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_004_off000050d5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50D5 25520 bytes
SHA-256: 3bfe0c5de08b5d01d8c355d27ef665815bcb9b3ac54bae76f4d8e4c1a0844362
font_01_sfnt_off00008ac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AC6 18308 bytes
SHA-256: 55eaac4e6bbee5e06de7435d22c867d27a3c8151a397b13177f5239675c95764