Malicious PDF — malware analysis report

Static analysis result for SHA-256 64f40d13b8b227d3…

MALICIOUS

PDF

46.0 KB Created: 2021-06-07 03:42:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 9524a3ffc73068cd51bc9d9ed8c0445e SHA-1: 10eea2736b97be31f9ca10d665ad5846ab2f41e9 SHA-256: 64f40d13b8b227d38f002ee6392a8f661c1c93bb87b7d3d42f02c246dd782bdc
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting a 'free generator / game hack' for Roblox. The ML classifier also flagged this PDF as malicious. While no scripts were directly extracted, the PDF structure and embedded URLs strongly indicate a phishing or scam attempt designed to lead users to potentially harmful content.

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.tw/app/431946152/cute-free-hair-on-roblox-game-hack In PDF document text
    • http://library.yamasi.ac.id/repository/coin-master-100-spin-slot_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/websites-that-give-free-robux_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/coin-master-facebook-page_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/coin-master-facebook_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/what-do-roblox-points-do_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/hack-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/hack-coin-master-online-without-human-verification_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/coin-master--hack_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/the-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/coin-master-hack-ios-apk_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/coin-master-hack-spin-ios_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/coin-master-70-spin-link-today_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/daily-free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/minecraft-18-9-hacked-client_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/minecraft-maps-pe-free-download_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/pubg-uc-cheap_GM1330123889.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/daily-free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/coin-master-free-daily-rewards_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-minecraft-survival-server_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-robux-games_GM431946152.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_off000050c7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50C7 27560 bytes
SHA-256: c4d3f8a6084ddbeae300dadb9c0850a9f5256fd5929950826c7ce24454280a30
font_01_sfnt_off000090c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90C1 18540 bytes
SHA-256: 488c37b81cb6318595a8d643f53454b31d34364b68f61b3c1daecc568804ddf5

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