Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ec6210514f9ac41…

MALICIOUS

PDF

49.9 KB Created: 2021-06-14 00:08:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 13477e59b280bdce9d36328380503b83 SHA-1: e71a34ced855fea3610111ff2d339d91d2a82f2e SHA-256: 3ec6210514f9ac41456651ab49cd9820a2100c41dd6a8231bfda577fa1337660
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple links to websites that are flagged as malicious redirectors, specifically advertising 'free Robux' or game hacks. The document body, though heavily obfuscated, contains references to these lures and the authoring application 'wkhtmltopdf', suggesting it was generated programmatically. The presence of multiple malicious redirector links indicates a high likelihood of this document being used to drive traffic to potentially harmful sites, possibly for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9349

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.co/app/431946152/free-robux-no-sign-in-game-hack In PDF document text
    • http://bufbd.org/images/get-free-robux-today_GM431946152.pdfIn PDF document text
    • http://bufbd.org/images/coin-master-ios-hack_GM406889139.pdfIn PDF document text
    • http://bufbd.org/images/free-minecraft-windows-10-account_GM479516143.pdfIn PDF document text
    • http://bufbd.org/images/coin-master-hack-apk_GM406889139.pdfIn PDF document text
    • http://bufbd.org/images/earn-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://bufbd.org/images/tiktok-free-package-dialog_GM835599320.pdfIn PDF document text
    • http://bufbd.org/images/coin-master-hack-link_GM406889139.pdfIn PDF document text
    • http://bufbd.org/images/link-for-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://bufbd.org/images/www-free-robux-com_GM431946152.pdfIn PDF document text
    • http://bufbd.org/images/javascript-free-robux_GM431946152.pdfIn PDF document text
    • http://bufbd.org/images/sites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://bufbd.org/images/free-roblox-characters_GM431946152.pdfIn PDF document text
    • http://bufbd.org/images/robux-free-account_GM431946152.pdfIn PDF document text
    • http://bufbd.org/images/how-to-get-free-robux-easy-2021_GM431946152.pdfIn PDF document text
    • http://bufbd.org/images/flame-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://bufbd.org/images/mobihack-net-roblox-hack-2021_GM431946152.pdfIn PDF document text
    • http://bufbd.org/images/coin-master-daily-free-spin-and-coin-link-haktuts_GM406889139.pdfIn PDF document text
    • http://bufbd.org/images/free-robux-no-scam_GM431946152.pdfIn PDF document text
    • http://bufbd.org/images/free-admin-roblox-youtube_GM431946152.pdfIn PDF document text
    • http://bufbd.org/images/gamekit-didnt-give-me-free-800-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000049c1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49C1 26440 bytes
SHA-256: d50fc9459ebe11e2a387e2c8a306165082db279623e538a6e693fcf23d90395f
font_01_sfnt_off000085a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85A4 8132 bytes
SHA-256: e6d68e720ea5acf9dccbf7ffde18db6f65c62a99ab7725aa43e30329033a7787
font_02_sfnt_off0000a091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA091 18420 bytes
SHA-256: f4ed1a0ad2bf1e01c5168cfd95adeee77ed178b256eed7a3f0b2ec8ae6c40823

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