Malicious PDF — malware analysis report

Static analysis result for SHA-256 e851631da0d22399…

MALICIOUS

PDF

34.3 KB Created: 2021-07-03 16:48:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: c7aaaf6c8eac9ee4d97940b7dd414244 SHA-1: 69e9f6a3fcdbb4bbb75c7b55e69beafb6b31362b SHA-256: e851631da0d223994cecd250a1fa75bc801b9a5e7fd46952e1ce25ce9c4a7d43
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to redirector infrastructure, specifically advertising 'game hacks' and 'generators' to lure users into downloading further malicious content. The ML classifier strongly indicated maliciousness, and the presence of numerous embedded URLs supports a phishing or social engineering attack pattern. No scripts were extracted, but the document's structure and content point towards a downloader or redirector for malware.

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.tw/app/406889139/working-coin-master-hack-2021-game-hack In PDF document text
    • http://perpustakaan.iaiqi.ac.id/repository/coin-master-hack-mod-apk_GM406889139.pdfIn PDF document text
    • http://perpustakaan.iaiqi.ac.id/repository/try-minecraft-free_GM479516143.pdfIn PDF document text
    • http://perpustakaan.iaiqi.ac.id/repository/free-minecraft-alts_GM479516143.pdfIn PDF document text
    • http://perpustakaan.iaiqi.ac.id/repository/easy-robux-generator_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iaiqi.ac.id/repository/how-to-duplicate-coin-master-spin-hack_GM406889139.pdfIn PDF document text
    • http://perpustakaan.iaiqi.ac.id/repository/roblox-free-recompense_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iaiqi.ac.id/repository/free-promo-codes-roblox-november-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iaiqi.ac.id/repository/restaurant-tycoon-hack-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iaiqi.ac.id/repository/how-to-get-free-robux-on-roblox-2021-may_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iaiqi.ac.id/repository/free-robux-app-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iaiqi.ac.id/repository/get-me-robux-for-free_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iaiqi.ac.id/repository/robux-com-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iaiqi.ac.id/repository/gow-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iaiqi.ac.id/repository/free-minecraft-account-generator_GM479516143.pdfIn PDF document text
    • http://perpustakaan.iaiqi.ac.id/repository/boku-no-roblox-remastered-op-gui-script-hack_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iaiqi.ac.id/repository/coin-master-free-spin-and-trading_GM406889139.pdfIn PDF document text
    • http://perpustakaan.iaiqi.ac.id/repository/free-roblox-shirt-download_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iaiqi.ac.id/repository/all-free-items-in-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iaiqi.ac.id/repository/roblox-cb-ro-hack_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iaiqi.ac.id/repository/roblox-hack-clients-virus-free_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_002_off00002fbb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2FBB 22520 bytes
SHA-256: 4e05d24f6d551ed87c913a3427e3f97cabebe08bf3ab02c0a2d75f8a97678260
font_01_sfnt_off00006200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6200 18604 bytes
SHA-256: ca9da6d68fac19d10b0af569e3839646c035d047714faa06f15c7475283719a2

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