Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb941da92b8d3dd0…

MALICIOUS

PDF

43.0 KB Created: 2021-06-11 00:33:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 4a83d962de2dab907d660fa82022f989 SHA-1: 69f7d074bde68997411d05ec30239d49b1529ab9 SHA-256: bb941da92b8d3dd0234f5de3ca22bdd948adf49bfe1d09aebb4de5f217e41d2a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically promoting "free generator / game hack" lures. The primary redirector identified is https://netcdn.tw/app/431946152/free-robux-rblox-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or social engineering attack aimed at driving traffic to malicious sites, likely for further payload delivery or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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 https://netcdn.tw/app/431946152/free-robux-rblox-game-hack In PDF document text
    • http://libsmpn1balongpo.sch.id//repository/coin-master-apk-hack-358_GM406889139.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id/repository/free-nike-shirt-roblox_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/real-coin-master-hacks_GM406889139.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/wurst-hacks_GM479516143.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/free-robux-microsoft_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id/repository/undertale-survive-the-monster-roblox-hack_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/coin-master-hack-apk-2021_GM406889139.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/robux-com-free-robux_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id/repository/auto-hacker-roblox_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id/repository/free-roblox-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/juego-hackeado-de-coin-master_GM406889139.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/minecraft-free-download-mobile_GM479516143.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/www-bandicam-com-free-robux_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/free-robux-no-scam_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id/repository/hacks-fpr-roblox_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/free-robux-codes-2021-real_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id/repository/free-robux-for-kids_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/free-spins-from-coin-master_GM406889139.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_off00004d8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4D8A 24912 bytes
SHA-256: 9bc8bfcfc2d67f7d0432686e7f125a2d71ab937b10ab897bf74ad2910daf3d68
font_01_sfnt_off00008627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8627 18088 bytes
SHA-256: 0939d253d402a816ad52dbaa25ce611969f289c2b645a5af93bd4c537f712fd4

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