Malicious PDF — malware analysis report

Static analysis result for SHA-256 c619feec24277d92…

MALICIOUS

PDF

42.9 KB Created: 2021-05-12 05:31:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: eec2bf77c4d49af7c202b88ef35fab9c SHA-1: 454aad8276dc5ed4138240ead0371dc190e63295 SHA-256: c619feec24277d92946d90db2fe4cbf38f1ecf6f113542ef1995cc41009f795b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirector domains, specifically advertising 'game hacks' and 'free generators' for popular games like Roblox and Coin Master. The primary link, https://netcdn.xyz/app/431946152/www-rbx-com-game-hack, is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to these lures and the wkhtmltopdf authoring application. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/431946152/www-rbx-com-game-hack In PDF document text
    • https://gaj.rs/images/2021-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://gaj.rs/images/coin-master-pc-hack-tool_GM406889139.pdfIn PDF document text
    • https://gaj.rs/images/minecraft-free-unblocked_GM479516143.pdfIn PDF document text
    • https://gaj.rs/images/how-do-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://gaj.rs/images/coin-master-cheat-free_GM406889139.pdfIn PDF document text
    • https://gaj.rs/images/get-free-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • https://gaj.rs/images/free-coin-spin-daily-link-net_GM406889139.pdfIn PDF document text
    • https://gaj.rs/images/minecraft-education-free_GM479516143.pdfIn PDF document text
    • https://gaj.rs/images/roblox-free-accessories_GM431946152.pdfIn PDF document text
    • https://gaj.rs/images/how-to-get-free-robux-on-phone_GM431946152.pdfIn PDF document text
    • https://gaj.rs/images/roblox-girl-avatar_GM431946152.pdfIn PDF document text
    • https://gaj.rs/images/coin-master-hack-account_GM406889139.pdfIn PDF document text
    • https://gaj.rs/images/robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://gaj.rs/images/roblox-bloxburg-hack_GM431946152.pdfIn PDF document text
    • https://gaj.rs/images/hack-coin-master-pc_GM406889139.pdfIn PDF document text
    • https://gaj.rs/images/coins-master-hack_GM406889139.pdfIn PDF document text
    • https://gaj.rs/images/coin-master-daily-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://gaj.rs/images/is-free-robux-real_GM431946152.pdfIn PDF document text
    • https://gaj.rs/images/coinmaster-spin-ml-free_GM406889139.pdfIn PDF document text
    • https://gaj.rs/images/free-spin-coin-master-ios_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_003_off0000491a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x491A 27232 bytes
SHA-256: 51f348ded6e923d2f36f752fbd9825291dafad5eaf2ad12ffa015c44dd369596
font_01_sfnt_off000084f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84F5 18332 bytes
SHA-256: 03a37bf507e0cad9bcf1387ae82c646cdce41af5350e7d54064c0facdd896ae5

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