Malicious PDF — malware analysis report

Static analysis result for SHA-256 416e6cf0a0477107…

MALICIOUS

PDF

34.1 KB Created: 2021-07-06 00:11:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: bfe1fac30668b5c2692051ddd670c548 SHA-1: 4578c00a8fa36e38ac466d2d2e7c9c32bd43190c SHA-256: 416e6cf0a04771070458c2fc6df462cae1bd21a96c39609be992064a71cbe8b3
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a redirector link, specifically advertising a 'free generator / game hack'. The document body and extracted URLs reinforce this lure, pointing to sites offering free in-game currency or hacks. The embedded URL likely leads to a malicious redirector designed to host further malicious content or phishing pages.

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/406889139/free-coins-on-coin-master-game-hack In PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-get-free-robux-on-phone-2021_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/roblox-com-free-play_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/http-coin-master-hack-club_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/roblox-geld-cheaten_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/earn-free-robux_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-do-you-get-free-roblox_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-hack-roblox-accounts-2021-easy_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/instant-robux_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/minecraft-pe-015-0-apk-free-download_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-geometry-dash-roblox-odes_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/roblox-free-clothes-hack_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-coin-master-spins-link_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/rbx-robux_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-stuff-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/roblox-t-shirt-free_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-hack-jailbreak-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-2021-robux_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-robux-app-real_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/pubg-uc-and-rp-generator_GM1330123889.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_off000030a4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x30A4 22780 bytes
SHA-256: 8753e84e7028fdc5a458a6fa9f347a88795eaee56ed9b64fb83c6ae1cfa97d12
font_01_sfnt_off000063a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63A2 17996 bytes
SHA-256: 5a33b6bec0c3c7706623313049573f1ed29e81c6598642f68d7630bc30e8a689

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