Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd50675e94e4f627…

MALICIOUS

PDF

44.5 KB Created: 2021-05-16 23:54:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 53c5f964b6ef28333f8266547920d7fd SHA-1: 72c1b52789d0ee5a76d8d67005bc01203f792464 SHA-256: fd50675e94e4f627989a0af4d8600d93545476ebb19d7778f6be17b5356e2ee0
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to websites offering game hacks and generators, identified as malicious redirectors. The document body, though heavily corrupted, contains references to 'Coin Master Hack Spins App' and URLs that align with the heuristic findings. The presence of embedded URLs and the nature of the lures suggest an attempt to redirect users to potentially malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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.xyz/app/406889139/coin-master-hack-spins-app-game-hack In PDF document text
    • http://tc-kulmbach.de/images/free-robux-instantly_GM431946152.pdfIn PDF document text
    • http://tc-kulmbach.de/images/get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://tc-kulmbach.de/images/robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://tc-kulmbach.de/images/info-roblox-com-robux_GM431946152.pdfIn PDF document text
    • http://tc-kulmbach.de/images/coin-master-15-free-spin-link-of-last-5-days_GM406889139.pdfIn PDF document text
    • http://tc-kulmbach.de/images/coin-master-unlimited-spins_GM406889139.pdfIn PDF document text
    • http://tc-kulmbach.de/images/easy-roblox-today_GM431946152.pdfIn PDF document text
    • http://tc-kulmbach.de/images/coin-master-free-spins-app_GM406889139.pdfIn PDF document text
    • http://tc-kulmbach.de/images/coin-master-free-spin-link-app_GM406889139.pdfIn PDF document text
    • http://tc-kulmbach.de/images/how-to-get-free-roblox-premium_GM431946152.pdfIn PDF document text
    • http://tc-kulmbach.de/images/coin-master-hack-dot-xyz_GM406889139.pdfIn PDF document text
    • http://tc-kulmbach.de/images/hackear-coin-master-sin-root_GM406889139.pdfIn PDF document text
    • http://tc-kulmbach.de/images/lazyblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://tc-kulmbach.de/images/free-robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • http://tc-kulmbach.de/images/robux-hack-free-robux_GM431946152.pdfIn PDF document text
    • http://tc-kulmbach.de/images/hack-minecraft_GM479516143.pdfIn PDF document text
    • http://tc-kulmbach.de/images/free-pet-treats-coin-master_GM406889139.pdfIn PDF document text
    • http://tc-kulmbach.de/images/how-to-get-free-robux-fast-and-easy_GM431946152.pdfIn PDF document text
    • http://tc-kulmbach.de/images/how-to-free-robux_GM431946152.pdfIn PDF document text
    • http://tc-kulmbach.de/images/how-do-you-get-free-roblox_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000048a5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48A5 24804 bytes
SHA-256: 45bab5512315f7c16f6de0a846e21f730de69a69c61095971b7412005abbf6db
font_01_sfnt_off000081a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81A7 3124 bytes
SHA-256: 9967c6221325a4ff3f7c4336922605f990450164c2eee2df708cc81823c6ec98
font_02_sfnt_off00008c85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C85 17892 bytes
SHA-256: 116ba2d485dba3cc3c3f0b67c538e954af0badc3125826b285df3e1af5dac94f

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