Malicious PDF — malware analysis report

Static analysis result for SHA-256 b63f8bf36fb5e172…

MALICIOUS

PDF

43.4 KB Created: 2021-06-14 01:43:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 9362bea2f51732c667d933e70e7f90ae SHA-1: 5d5e40f25b18adde6dd08b623e387494542a698b SHA-256: b63f8bf36fb5e172035ee2d4a627430f24c9a0a13c00a27e47334864dd5e8637
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a redirector infrastructure, specifically advertising 'free Robux' and 'game hacks' to lure users. The primary redirector URL identified is http://netcdn.co/app/431946152/free-robux-no-download-2021-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a malicious intent to redirect users to potentially harmful websites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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-download-2021-game-hack In PDF document text
    • https://art-concept.gr/images/roblox-free-roblox-card-codes-2021_GM431946152.pdfIn PDF document text
    • http://www.art-concept.gr/images/free-spin-app-coin-master_GM406889139.pdfIn PDF document text
    • https://art-concept.gr/images/roblox-cheat-engine-detection_GM431946152.pdfIn PDF document text
    • https://art-concept.gr/images/hacks-to-steal-robux-sign-up_GM431946152.pdfIn PDF document text
    • http://www.art-concept.gr/images/coin-master-facebook-page_GM406889139.pdfIn PDF document text
    • https://art-concept.gr/images/free-followers-roblox-generator_GM431946152.pdfIn PDF document text
    • https://art-concept.gr/images/site-cheat-roblox_GM431946152.pdfIn PDF document text
    • http://www.art-concept.gr/images/coin-master-daily-free-spins_GM406889139.pdfIn PDF document text
    • https://art-concept.gr/images/how-to-hack-roblox-to-get-lots-of-robux_GM431946152.pdfIn PDF document text
    • https://art-concept.gr/images/neruc-icu-roblox-hack_GM431946152.pdfIn PDF document text
    • https://art-concept.gr/images/how-to-glitch-to-a-free-event-item-in-roblox_GM431946152.pdfIn PDF document text
    • https://art-concept.gr/images/roblox-jailbreak-hack-redboy_GM431946152.pdfIn PDF document text
    • https://art-concept.gr/images/how-to-get-free-robux-no-survey-or-download_GM431946152.pdfIn PDF document text
    • http://www.art-concept.gr/images/get-free-robux-now_GM431946152.pdfIn PDF document text
    • https://art-concept.gr/images/fun-hacks-roblox_GM431946152.pdfIn PDF document text
    • http://www.art-concept.gr/images/optifine-mcpe_GM479516143.pdfIn PDF document text
    • http://www.art-concept.gr/images/are-minecraft-realms-free_GM479516143.pdfIn PDF document text
    • https://art-concept.gr/images/colossus-legends-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.art-concept.gr/images/free-robux-exe_GM431946152.pdfIn PDF document text
    • https://art-concept.gr/images/how-to-get-free-robux-hack-on-phone_GM431946152.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_off000049b2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49B2 25120 bytes
SHA-256: 5b436fbb94d4b879f7619c44984278b0172ecf0ae5a7df3ab8830bf89ca3ac27
font_01_sfnt_off00008449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8449 19224 bytes
SHA-256: b4534d771c4cb34b840c142fba640750969bbad29e0a340756c1f913fdd021b3

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