Malicious PDF — malware analysis report

Static analysis result for SHA-256 71cbec10b3b25690…

MALICIOUS

PDF

47.6 KB Created: 2021-05-13 13:57:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 0657bee6915f0a174e2be9c001b4c316 SHA-1: 499a86205352b6f5c0329a9bec56bd519b82592d SHA-256: 71cbec10b3b256900ed48a7661eb71f1cca0cc1eb38538d86992a6966ce00cce
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically advertising a 'Coin Master Free Attack Game Hack'. The document body and embedded URLs strongly suggest a social engineering lure to drive traffic to potentially malicious sites. While no scripts were directly extracted, the PDF structure and heuristic firings indicate a malicious redirector chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8715

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-free-attack-game-hack In PDF document text
    • https://ethraa.ae/userfiles/files/game-hunters-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://ethraa.ae/userfiles/files/roblox-avatar-girl_GM431946152.pdfIn PDF document text
    • https://ethraa.ae/userfiles/files/how-to-get-free-robux-on-mobile_GM431946152.pdfIn PDF document text
    • https://ethraa.ae/userfiles/files/coin-spin_GM406889139.pdfIn PDF document text
    • https://ethraa.ae/userfiles/files/coin-master-club-hack_GM406889139.pdfIn PDF document text
    • https://ethraa.ae/userfiles/files/free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://ethraa.ae/userfiles/files/how-can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • https://ethraa.ae/userfiles/files/free-robux-hacker-us_GM431946152.pdfIn PDF document text
    • https://ethraa.ae/userfiles/files/minecraft-skins-free-girl_GM479516143.pdfIn PDF document text
    • https://ethraa.ae/userfiles/files/download-coin-master-apk-hacked_GM406889139.pdfIn PDF document text
    • https://ethraa.ae/userfiles/files/coin-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://ethraa.ae/userfiles/files/free-robux-hack-us_GM431946152.pdfIn PDF document text
    • https://ethraa.ae/userfiles/files/free-robux-2021-no-verification_GM431946152.pdfIn PDF document text
    • https://ethraa.ae/userfiles/files/extra-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://ethraa.ae/userfiles/files/free-robux-games_GM431946152.pdfIn PDF document text
    • https://ethraa.ae/userfiles/files/coin-master-daily-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • https://ethraa.ae/userfiles/files/free-robux-app-real_GM431946152.pdfIn PDF document text
    • https://ethraa.ae/userfiles/files/free-roblox-com_GM431946152.pdfIn PDF document text
    • https://ethraa.ae/userfiles/files/roblox-login-hack_GM431946152.pdfIn PDF document text
    • https://ethraa.ae/userfiles/files/how-to-get-2021-robux-for-free_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000483c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x483C 26380 bytes
SHA-256: a909f8cec43e33392afd911a545a40f2bbb60901c5f610b630389f6e1b46fbd3
font_01_sfnt_off000083e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83E8 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off00008dd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DD2 17880 bytes
SHA-256: 96402d2e96280801386aa337121127c59561cdc8f458ec32dbe1421b57db916e
font_03_sfnt_off0000ae8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE8F 3264 bytes
SHA-256: e32c06502c11b52acb5e814091c5fdbffd1e2a904ac7a9cfb8b5b180bd139088

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