Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0721a79ed69a152…

MALICIOUS

PDF

51.9 KB Created: 2021-05-14 15:31:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 81bb716aa040fc83b7a6c5b6f5089785 SHA-1: a245cdaaadeab462c0c42fc783ac9ec23125a685 SHA-256: c0721a79ed69a152c3caa32deadfd4c49c3b1ead5c5d5bcc8ecce173822bb0da
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to malicious redirectors, disguised as "free generator" or "game hack" lures for popular games like Minecraft and Roblox. The document body and embedded URLs strongly suggest a phishing or scam attempt to trick users into visiting potentially harmful sites. No scripts were extracted, but the presence of numerous malicious links indicates a high likelihood of further malicious activity upon user interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8646

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/479516143/free-minecraft-videos-game-hack In PDF document text
    • http://huounaixunghe.com/images/coin-master-free-spins-link-2021-no-verification_GM406889139.pdfIn PDF document text
    • http://huounaixunghe.com/images/roblox-hacks-com_GM431946152.pdfIn PDF document text
    • http://huounaixunghe.com/images/lots-of-robux_GM431946152.pdfIn PDF document text
    • http://huounaixunghe.com/images/instantrobux_GM431946152.pdfIn PDF document text
    • http://huounaixunghe.com/images/coin-master-free-spins-link-2021-download_GM406889139.pdfIn PDF document text
    • http://huounaixunghe.com/images/make-robux_GM431946152.pdfIn PDF document text
    • http://huounaixunghe.com/images/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • http://huounaixunghe.com/images/free-minecraft-alt-generator_GM479516143.pdfIn PDF document text
    • http://huounaixunghe.com/images/free-robux-no-scam_GM431946152.pdfIn PDF document text
    • http://huounaixunghe.com/images/minecraft-bedrock-for-free_GM479516143.pdfIn PDF document text
    • http://huounaixunghe.com/images/coin-master-free-spin-generator-without-human-verification_GM406889139.pdfIn PDF document text
    • http://huounaixunghe.com/images/roblox-dominus-free_GM431946152.pdfIn PDF document text
    • http://huounaixunghe.com/images/free-robux-offers_GM431946152.pdfIn PDF document text
    • http://huounaixunghe.com/images/coin-master-mod-free-download_GM406889139.pdfIn PDF document text
    • http://huounaixunghe.com/images/links-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://huounaixunghe.com/images/free-coin-master-spins-hack_GM406889139.pdfIn PDF document text
    • http://huounaixunghe.com/images/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • http://huounaixunghe.com/images/free-robux-generator-2021-no-survey_GM431946152.pdfIn PDF document text
    • http://huounaixunghe.com/images/free-spin-app-coin-master_GM406889139.pdfIn PDF document text
    • http://huounaixunghe.com/images/robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004a13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4A13 24652 bytes
SHA-256: b730e1f5062600711f0318f306b970bb7ac31a85f6128b13f24c5202ab8a9683
font_01_sfnt_off00008164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8164 7936 bytes
SHA-256: 218d53b68bdddb064f6fba4be822d5b3725ed1cef1a3b42796a8dd99c4a62f4e
font_02_sfnt_off00009a8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9A8D 4232 bytes
SHA-256: ab6320ab342704d2c5943abfba82ed4837bf2da871c91621741fd4cfd15c6ed5
font_03_sfnt_off0000a919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA919 18020 bytes
SHA-256: 6cfe610ecbcacf9195189a6c1e3d6544445db69855dd5d4e392c322ec4193c6d

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