Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cf38042fea796c5…

MALICIOUS

PDF

44.5 KB Created: 2021-06-04 00:55:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: fa9f789fbd26064af0b012ceb91f8ce5 SHA-1: 52d1cb12d0bf0f025fff877333de5f2c6f9dc1b8 SHA-256: 8cf38042fea796c50c8d206548c4e9508541eb54ff341bfe68517b58d30d70e3
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, disguised as 'free generator' or 'game hack' lures. The primary link directs to 'https://netcdn.online/app/431946152/free-robux-codes-no-verification-game-hack', which is likely intended to trick users into downloading a second-stage payload. The document body, though heavily corrupted, contains references to similar lures and the authoring application 'wkhtmltopdf', suggesting it was programmatically generated to host these malicious links.

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/431946152/free-robux-codes-no-verification-game-hack In PDF document text
    • http://elibrary.fl.unud.ac.id/repository/freerobux-co_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/free-coins-and-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/free-tiktok-views-no-verification_GM835599320.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/coin-master-hack-game-download-mod-apk_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/blogger-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/free-robux-not-fake_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/how-do-you-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/coin-master-hacks-for-android_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/can-you-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/how-to-get-free-robux-fast-and-easy_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/2021-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/como-tener-400-robux-gratis-sin-hack_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/coin-master-generator-hack_GM406889139.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/free-robux-no-generator_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/daily-coin-master-free-spin-link-facebook_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/how-to-get-free-robux-games_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/sites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/minecraft-free-exe_GM479516143.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/coin-master-apk-hack-download_GM406889139.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_off00004fdb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FDB 25112 bytes
SHA-256: 31b337c1796d61419d6d7da45fcfdc6c1efab0bd163c9d9ff3fecfe1d028b4e9
font_01_sfnt_off000089c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89C0 18776 bytes
SHA-256: 1501cc25bcf8c3b3bf9df14f68216c1cc39cc5b0131e4343b63bafa21afb9c06

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