Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cb72deef5bdabd5…

MALICIOUS

PDF

34.6 KB Created: 2021-06-28 05:30:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: fe3d010c5cd8c37f5d222cce014da228 SHA-1: df7795f18a51c9fa0c86a85238b9cab40cf6f6b2 SHA-256: 4cb72deef5bdabd52cc165bdd579890c14f8b2886f08803ffbd8f1262ceb39b9
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to external websites, including a known malicious redirector, under the guise of providing game hacks. The document body and embedded URLs suggest a lure for users seeking 'free robux' or game exploits, which is a common social engineering tactic. The ML classifier also strongly indicated maliciousness.

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/how-to-hack-someone-on-roblox-2021-game-hack In PDF document text
    • http://library.atim.ac.id/repository/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/vex0rmillion-hack-roblox_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/hack-para-tener-robux-rapido_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/how-to-hack-roblox-with-roblox-plus_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/best-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/roblox-cheat-engine-hack-codes_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/critical-strike-roblox-free-gamepass_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/hacks-para-wall-por-el-chat-roblox_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/webrobloxcom-hack_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/how-to-get-verified-on-tiktok-for-free-2021_GM835599320.pdfIn PDF document text
    • http://library.atim.ac.id/repository/minecraft-apk-free-download-016-0_GM479516143.pdfIn PDF document text
    • http://library.atim.ac.id/repository/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://library.atim.ac.id/repository/how-to-hack-hero-academy-roblox_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/mediafre-download-roblox-hack_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/roblox-aimbot-hack-mac_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/roblox-hack-robux-pastebin-octubre-2021_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/free-robux-site_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/coin-master-free-spins-and-coins-today_GM406889139.pdfIn PDF document text
    • http://library.atim.ac.id/repository/free-robux-mobile_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/cute-free-stuff-on-roblox_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_002_off00002ebb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2EBB 22500 bytes
SHA-256: 32558e7eef674b809eec6f987cc552455e179896c69b4e7091356224b630d813
font_01_sfnt_off000060df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60DF 19480 bytes
SHA-256: d330350eec775ad06d67b8d40934e5f7135b9e92aeab6bb67931f68481ddbd19

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