Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f11aa534b5f658b…

MALICIOUS

PDF

32.6 KB Created: 2021-07-20 18:22:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 895dba7c705a2ed6b075adffc8973a32 SHA-1: 02748b5716f7b5c833bfdb9fb3a0604b281fd2aa SHA-256: 8f11aa534b5f658b2b628679cc67de37e72f0a0a82e33b62e69d1485e488f3c0
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded URLs and document body text that explicitly advertises a "Coin Master Free 2021 Spin Link" and provides a direct link to "netcdn.tw". This strongly suggests a social engineering lure designed to trick users into visiting a potentially malicious site. The ML classifier also flagged this PDF as malicious, increasing confidence in its suspicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9452

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/coin-master-free-2021-spin-link-game-hack In PDF document text
    • https://madhavbaugwellness.com/wp-content/uploads/fsqm-files/free-tiktok-followers-no-survey_GM835599320.pdfIn PDF document text
    • https://madhavbaugwellness.com/wp-content/uploads/fsqm-files/free-minecraft-resource-packs_GM479516143.pdfIn PDF document text
    • https://madhavbaugwellness.com/wp-content/uploads/fsqm-files/coin-master-free-daily-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://madhavbaugwellness.com/wp-content/uploads/fsqm-files/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • https://madhavbaugwellness.com/wp-content/uploads/fsqm-files/free-robux-cards_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_off000028e4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x28E4 23164 bytes
SHA-256: c51c013bc08a82d793701c4da7feca2562e73f9058d4c4e209a2a1232523f6fc
font_01_sfnt_off00005d14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D14 18456 bytes
SHA-256: b7ae3d16bb028351929840db057611194e7c02105e6dbd3e36d0326cc4cd0414

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