Malicious PDF — malware analysis report

Static analysis result for SHA-256 d64ee72cc7741223…

MALICIOUS

PDF

49.0 KB Created: 2021-06-04 01:00:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: cdd9e77f5641ae444271368d89567b9a SHA-1: 8306667486e71e61c3432d5c12dd9a4338acff11 SHA-256: d64ee72cc77412230d5ec4957de4e034a2702e941ec61dcb4eb377f866c0bfad
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and websites offering game hacks, indicating a lure for users to visit potentially harmful sites. The document body and embedded URLs strongly suggest a social engineering tactic to trick users into downloading or accessing malicious content. No scripts were extracted, but the presence of malicious links and the ML classifier's high confidence score support the malicious verdict.

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/coin-master-hack-apk-free-download-game-hack In PDF document text
    • http://www.library.umbjm.ac.id/repository/best-free-robux-sites_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-robux-on-iphone_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-game-hack-apk_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-robux-com-2021_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/minecraft-net-download-free_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-robux-with-no-survey_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/spin-links-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-robux-codes-2021-not-used_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/roblox-april-fools-hack_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/pubg-uc-earning-app-in-pakistan_GM1330123889.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-modded-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-online-minecraft-server_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/windows-10-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/tiktok-free-fans-cheat_GM835599320.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/robux-giver_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-get-free-minecraft-alts_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-spin-coin-master-game_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/roblox-hack-retail-tycoon_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/sites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-robux-generator-2021_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_off00005029.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5029 24016 bytes
SHA-256: 099ec81893cedcb25e0ef7edf219912acf7b69fec5ee8bdf42386ff2d38bafae
font_01_sfnt_off00008726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8726 8676 bytes
SHA-256: e06aca5f85e50ae6cefda302c5299c18ab6d27c174f74f0bb0ee8efa7ccb4468
font_02_sfnt_off00009bb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9BB1 18636 bytes
SHA-256: 9aef5eba1b944da03ad0d0211b0df86da0d90e0cf099764a6ba9c9a2ed29eb67

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