Malicious PDF — malware analysis report

Static analysis result for SHA-256 72a891b120610e42…

MALICIOUS

PDF

34.6 KB Created: 2021-06-22 12:46:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: d7ecb2e41b41f8c2fd72abbc9a102747 SHA-1: d3763a8ed1f5491db543030c598e628d49a2780a SHA-256: 72a891b120610e4238e175b303b4a5091033e66858973bbb21a09137259d9f18
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one to a known malicious redirector infrastructure at http://netcdn.co/app/431946152/free-robux-rewards-discord-game-hack. The document body and heuristics indicate a lure for game-related rewards or hacks, likely intended to lead users to a phishing or malware download site. No scripts were extracted from this sample, but the embedded URLs and redirector findings are strong indicators of malicious intent.

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.co/app/431946152/free-robux-rewards-discord-game-hack In PDF document text
    • http://www.riverkennet.org/uploads/files/files/coin-master-free-shield-link_GM406889139.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/robux-for-offers_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/robux-hack-inspect-code_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/script-hack-roblox-phantom-forces-2021_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/free-t-shirts-roblox-to-look-like-a-pro_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/get-free-robux-with-synapse_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/minecraft-jar-free_GM479516143.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/minecraft-116-apk-download_GM479516143.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/minecraft-rtx-download-free_GM479516143.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/master-free-spin_GM406889139.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/roblox-free-stuff-for-girls_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/how-to-get-minecraft-pe-for-free_GM479516143.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/robloxheroxyz-free-robux_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/tiktok-fans-free_GM835599320.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/minecraft-wurst-client_GM479516143.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/how-to-hack-someones-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/today-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/minecraft-free-edition_GM479516143.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/free-spin-coin-master-apk_GM406889139.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000030b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30B7 21948 bytes
SHA-256: aa3e12f268e833cfda153693f2eecdfd75f1e18260ed563f3bb5578d74c1e19a
font_01_sfnt_off0000614f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x614F 19344 bytes
SHA-256: 129046a49cf43806d2baf35bf0df57f6553d53156f433fd78783ae18e3527558

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