Malicious PDF — malware analysis report

Static analysis result for SHA-256 279f238de75a69a3…

MALICIOUS

PDF

33.7 KB Created: 2021-06-29 11:39:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: ef8ba584fd982a7014eb7a50938bf31b SHA-1: 77f670eba71a771eeef05ea45036cef738254db1 SHA-256: 279f238de75a69a3d1101103857f8e8fb49ef6ee1a550e831f6385539481b0a9
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, specifically advertising 'free generator / game hack' lures for popular games. The embedded URLs, such as http://netcdn.co/app/431946152/best-free-mask-on-roblox-game-hack, are designed to trick users into downloading potentially malicious files or visiting phishing sites. The ML classifier strongly supports the malicious nature of this PDF.

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/best-free-mask-on-roblox-game-hack In PDF document text
    • https://doingimc.com/image/data/files/bux-gg-robux-free_GM431946152.pdfIn PDF document text
    • https://doingimc.com/image/data/files/robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://doingimc.com/image/data/files/free-robux-games-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • https://doingimc.com/image/data/files/minecraft-windows-10-mod-menu_GM479516143.pdfIn PDF document text
    • https://doingimc.com/image/data/files/free-rewards-coin-master_GM406889139.pdfIn PDF document text
    • https://doingimc.com/image/data/files/robux-now_GM431946152.pdfIn PDF document text
    • https://doingimc.com/image/data/files/how-to-get-free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • https://doingimc.com/image/data/files/2021-hacks-for-robloxs-aimbot_GM431946152.pdfIn PDF document text
    • https://doingimc.com/image/data/files/minecraft-fly-hack_GM479516143.pdfIn PDF document text
    • https://doingimc.com/image/data/files/coin-master-vip-hack_GM406889139.pdfIn PDF document text
    • https://doingimc.com/image/data/files/download-free-robux-giver_GM431946152.pdfIn PDF document text
    • https://doingimc.com/image/data/files/how-to-hack-roblox-to-get-to-the-admin-robux_GM431946152.pdfIn PDF document text
    • https://doingimc.com/image/data/files/free-game-card-codes-roblox-2021_GM431946152.pdfIn PDF document text
    • https://doingimc.com/image/data/files/roblox-join-players-that-arent-freind-hack-2021_GM431946152.pdfIn PDF document text
    • https://doingimc.com/image/data/files/blox-supply-free-robux_GM431946152.pdfIn PDF document text
    • https://doingimc.com/image/data/files/coin-master-hack-app-link_GM406889139.pdfIn PDF document text
    • https://doingimc.com/image/data/files/moonactive-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://doingimc.com/image/data/files/master-coin-free-spin-daily_GM406889139.pdfIn PDF document text
    • https://doingimc.com/image/data/files/minecraft-free-no-download_GM479516143.pdfIn PDF document text
    • https://doingimc.com/image/data/files/bloxawards-com-earn-free-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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002de9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DE9 21980 bytes
SHA-256: 4291b5d09d11d52e7cda61b3a7998dabd744673e11f86560dadd9ba187aca226
font_01_sfnt_off00005e40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E40 19120 bytes
SHA-256: e62c11c5621daf68f00107528b220578a2dac09d992463236b15713938923f2d

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