Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ef3e90c940f0611…

MALICIOUS

PDF

34.8 KB Created: 2021-07-05 17:40:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 134bfb3af242d4f72c4bbf41b2964053 SHA-1: 526bd75e694d5e8c359509a6ed6c7238ec08555d SHA-256: 4ef3e90c940f06113d3fcc1079f6beed3670e87fd917b8bf612543c837e2adbb
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one identified as a malicious redirector, that promise free game currency or hacks. The document body explicitly mentions 'Free Robux For Kids No Verification' and 'game hack', indicating a social engineering lure. The presence of numerous embedded URLs suggests an attempt to direct the user to potentially malicious sites for further exploitation or malware delivery.

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.tw/app/431946152/free-robux-for-kids-no-verification-game-hack In PDF document text
    • http://perpus.masda.ac.id/repository/easy-hack-to-get-halos-in-royale-high-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/minecraft-cheats-switch_GM479516143.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/how-to-use-hack-in-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/athena-roblox-hack_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/free-spins-in-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/roblox-assassin_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/free-spins-coin-master-links-no-human-verification_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/roblox-hacked-com-2021_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/free-generator_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/free-roblox-outfits_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/how-to-get-free-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/free-codes-get-robux_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/free-roblox-printables_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/broken-bones-iv-roblox-hack_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/how-to-get-free-robux-youtube_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/pubg-uc-20210_GM1330123889.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/free-robux-codes-january-2021_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/robux-survey_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/how-to-get-minecraft-for-free-on-computer_GM479516143.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
font_00_sfnt_off0000300e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x300E 22676 bytes
SHA-256: a61d5e5805596a9d28c97ff45a7186af6fc7873d6758574aa93f3b105bd6aa11
font_01_sfnt_off00006258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6258 19248 bytes
SHA-256: cfee841a5dae106b2cf9b4cdd4f4599820923438d7b3e36504f4b087b21eb8e1

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