Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b8ccff0638a3462…

MALICIOUS

PDF

33.9 KB Created: 2021-06-17 22:48:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 0f9121c2830976c1cc3dcc1176b830ac SHA-1: 879f3b0876a2ab6336b494787a226bc3554cafae SHA-256: 3b8ccff0638a3462961c492bc18e5e7b0f82228aa7d43cb0b6cbc77cf59119d7
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple embedded URLs, with a primary focus on redirecting users to a URL associated with malicious infrastructure. The document body and heuristic firings indicate a lure for 'free generators' or 'game hacks', specifically mentioning Roblox, to entice clicks. The presence of embedded URLs and the ML classifier's high confidence score support this assessment.

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/free-roblox-hair-codes-game-hack In PDF document text
    • http://elib-s2.ubl.ac.id/repository/free-coin-master-spins-blog_GM406889139.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/minecraft-bedrock-free_GM479516143.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/how-to-hack-goggle-systems-in-roblox_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/robux-hack-infinite-robux_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/free-100-robux_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/today-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/roblox-robux-hack-cheat-engine-62_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/free-robux-no-verification-needed_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/free-quirk-boku-no-roblox_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/free-robux-hack-glitch_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/how-to-hack-in-roblox-without-cheat-engine_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/free-ninja-animation-roblox-hack_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/free-yellow-roblox-girlfriend_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/roblox-free-shirts-2021_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/free-purple-outfit-on-roblox_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/how-to-get-free-robux-without-verification-or-surveys_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/roblox-robux-hacks-no-verification_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/cheat-kart-roblox_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/free-robux-codes-no-verification_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/websites-to-get-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_off00002f9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F9F 22100 bytes
SHA-256: 0095b106cbb96b7c0d98934967d4f3fcbb9f412086084e21ddaab26e0b8a6cf4
font_01_sfnt_off0000605b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x605B 18756 bytes
SHA-256: 97db5818a66e9b6f24b38240901fb91ee33acc25d4f4f7eb2bd2d5d180ac90bd

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