Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c3a60a7ec847411…

MALICIOUS

PDF

44.3 KB Created: 2021-06-03 09:05:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 4e7c87f04130c41fdf17cd0104a8951e SHA-1: 870d70e105faccf27cc896dcab4f1d8192fdd8fa SHA-256: 8c3a60a7ec84741151339b7f28e52e21f1af7808d03c40ef83dcc8dca6eb4085
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirector infrastructure, specifically promoting "free coin and spin" generators for games. The document body and embedded links strongly suggest a lure to a scam or potentially a phishing site. No scripts were extracted from this sample, but the presence of malicious links and the ML classifier firing indicate a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.online/app/406889139/free-coin-and-spin-for-coin-master-game-hack In 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/60-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/coin-master-free-spins-link-fb_GM406889139.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/coin-master-free-link-daily_GM406889139.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/buy-robux-free_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/coin-master-free-spins-hack-ios_GM406889139.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/minecraft-auto-miner-hack_GM479516143.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/coin-master-free-spins-link-2021-march_GM406889139.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/coin-master-cards-hack-2021_GM406889139.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/free-tiktok-email-and-password_GM835599320.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/2021-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/unlimited-robux-2021_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/free-robux-2021_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/robuxy-com-free-robux_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/coin-master-daily-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/robux-hack-free-robux_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/a-lot-of-robux_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/coin-master-free-spins-that-really_GM406889139.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/free-robux-2021-no-verification_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_004_off000052ac.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52AC 24576 bytes
SHA-256: 65cf9996168116f2bdc446e815685d7c0c9d407537762ff3d69a106ed8ba25bf
font_01_sfnt_off00008b32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B32 18060 bytes
SHA-256: 42d2e7759bfcfecd447a46542d8809f4e944f7c9df23d0847fbb4c7837fae2b0

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