Malicious PDF — malware analysis report

Static analysis result for SHA-256 c133a499664182fe…

MALICIOUS

PDF

43.6 KB Created: 2021-06-03 05:37:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 5143450665b722c04924c06cbc8a6b76 SHA-1: 9483d0669220ae3757bb57ba82a884fe437f2658 SHA-256: c133a499664182fe158d903955fee044e2e134a1f1b5f4d12cb7e751c9773038
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to redirector infrastructure, specifically advertising 'free generator' or 'game hack' lures for popular mobile games. The primary link directs to a known malicious redirector, suggesting the document is designed to trick users into downloading further malware or visiting malicious sites. No scripts were extracted, but the embedded URLs and heuristic firings strongly indicate a phishing or social engineering attack.

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/coin-master-20-free-spins-link-today-game-hack In PDF document text
    • https://weddingcards-expert.tw/upload/files/coin-master-hack-pc-2021_GM406889139.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/orewards-com-free-robux_GM431946152.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/roblox-games-with-free-radio_GM431946152.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/how-to-get-free-spins-grom-coin-master_GM406889139.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/unlimited-robux_GM431946152.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/how-to-get-free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/coin-master-free-spins-2021-today_GM406889139.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/minecraft-realms-free-trial_GM479516143.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/free-coin-master-coins_GM406889139.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/coin-master-free-snacks-link_GM406889139.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/free-minecraft-premium-account_GM479516143.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/minecraft-bedrock-edition-download-pc-free_GM479516143.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/how-to-get-free-spins-on-coin-master-android_GM406889139.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/coin-master-gold-cards-hack-2021_GM406889139.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/coin-master-cheats-free-spins_GM406889139.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/get-free-robux-info_GM431946152.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/tiktok-free-trial-likes_GM835599320.pdfIn PDF document text
    • https://weddingcards-expert.tw/upload/files/free-robux-games-that-actually-work_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_off00004cea.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4CEA 25416 bytes
SHA-256: 4a18c1b1b54508bccaea9000cbb65426140f95fcae7632ab4bc4f50e3fe168b0
font_01_sfnt_off00008679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8679 18708 bytes
SHA-256: 12e287a5003346b2d0ade94f1738d16a0662f4443659e1f710297a0eebb69c5d

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