Malicious PDF — malware analysis report

Static analysis result for SHA-256 81f5d4eb0b0c31b3…

MALICIOUS

PDF

42.8 KB Created: 2021-05-19 06:30:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: bed2a34382ae98278a373722bb4dafed SHA-1: eea134cc4da2a6912f0cbc72117ea6b2e267647f SHA-256: 81f5d4eb0b0c31b3b51ce819ae1b2e722e9eeadc798ee7930ddc123886b29e84
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs and a primary external URI pointing to sites offering 'free spins' for Coin Master, a common lure for scams. The ML classifier strongly flagged this PDF as malicious, and the presence of these links suggests an attempt to redirect users to potentially malicious content or phishing pages. No scripts were extracted, but the document's structure and embedded links indicate a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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/free-spins-on-coin-master-2021-game-hack In PDF document text
    • http://emilac.com/images/coin-master-spin-free_GM406889139.pdfIn PDF document text
    • http://emilac.com/images/minecraft-packs-free_GM479516143.pdfIn PDF document text
    • http://emilac.com/images/coin-master-fan-page_GM406889139.pdfIn PDF document text
    • http://emilac.com/images/how-to-change-roblox-username-for-free-2021_GM431946152.pdfIn PDF document text
    • http://emilac.com/images/coin-master-free-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • http://emilac.com/images/roblox-hacks-and-cheats_GM431946152.pdfIn PDF document text
    • http://emilac.com/images/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://emilac.com/images/freerobux-hack-us_GM431946152.pdfIn PDF document text
    • http://emilac.com/images/roblox-prison-life-hack_GM431946152.pdfIn PDF document text
    • http://emilac.com/images/download-coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://emilac.com/images/coin-master-spins_GM406889139.pdfIn PDF document text
    • http://emilac.com/images/rbxcity-free-robux_GM431946152.pdfIn PDF document text
    • http://emilac.com/images/cheat-codes-for-coin-master_GM406889139.pdfIn PDF document text
    • http://emilac.com/images/free-robux-generator-2021-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://emilac.com/images/microsoft-free-robux_GM431946152.pdfIn PDF document text
    • http://emilac.com/images/free-robux-no-human-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://emilac.com/images/free-coins--spins-coin-master_GM406889139.pdfIn PDF document text
    • http://emilac.com/images/tiktok-free-download-for-pc_GM835599320.pdfIn PDF document text
    • http://emilac.com/images/how-to-get-free-roebucks-on-roblox_GM431946152.pdfIn PDF document text
    • http://emilac.com/images/coin-master-hack-android_GM406889139.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_003_off0000458e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x458E 27548 bytes
SHA-256: b26b0a1b645b926fa0e08d3243bc0c68645f8dccb6303b7f3a92086cf59e310d
font_01_sfnt_off00008513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8513 18288 bytes
SHA-256: e7fc04cebd192de8ea685c8f65a9790caba4d729d1f53b0455241ee170bde56f

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