Malicious PDF — malware analysis report

Static analysis result for SHA-256 28d176b5cfba53c1…

MALICIOUS

PDF

48.9 KB Created: 2021-05-12 13:52:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: b32cde3c78cb5ed2d141bbe8167673e8 SHA-1: a462614cc019636dcc06755d404ae8f5441975b5 SHA-256: 28d176b5cfba53c1a563cb3a11f2da65ba799d3cfbd329e023f56014f4234b24
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple links to known malicious redirectors and lures users with 'free generator / game hack' content, indicating a phishing or scam attempt. The primary malicious URL identified is https://netcdn.xyz/app/406889139/coin-master-free-spins-no-generator-game-hack. The document's structure and embedded links suggest it is designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8642

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-spins-no-generator-game-hack In PDF document text
    • http://linde-erbach.de/images/hack-coin-master-apk-31_GM406889139.pdfIn PDF document text
    • http://linde-erbach.de/images/coin-master-daily-free-spins-link-app_GM406889139.pdfIn PDF document text
    • http://linde-erbach.de/images/how-to-get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://linde-erbach.de/images/www-bandicam-com-free-robux_GM431946152.pdfIn PDF document text
    • http://linde-erbach.de/images/coin-master-free-coins-and-spins-2021_GM406889139.pdfIn PDF document text
    • http://linde-erbach.de/images/www-cheatsk-com-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://linde-erbach.de/images/coin-master-game-hack-app-download_GM406889139.pdfIn PDF document text
    • http://linde-erbach.de/images/minecraft-hack-mod_GM479516143.pdfIn PDF document text
    • http://linde-erbach.de/images/free-robux-only-1-step_GM431946152.pdfIn PDF document text
    • http://linde-erbach.de/images/free-spin-hack-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://linde-erbach.de/images/krnl-download_GM431946152.pdfIn PDF document text
    • http://linde-erbach.de/images/daily-free-spins_GM406889139.pdfIn PDF document text
    • http://linde-erbach.de/images/blox-supply-free-robux_GM431946152.pdfIn PDF document text
    • http://linde-erbach.de/images/can-i-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://linde-erbach.de/images/how-to-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • http://linde-erbach.de/images/free-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • http://linde-erbach.de/images/free-robux-com-roblox_GM431946152.pdfIn PDF document text
    • http://linde-erbach.de/images/coin-master-free-daily-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://linde-erbach.de/images/robux-fun-hack_GM431946152.pdfIn PDF document text
    • http://linde-erbach.de/images/robux-no-human-verification_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_off00004987.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4987 26744 bytes
SHA-256: 1ffa8bcd73887eda4ce22f40273cff749c8c434e11fce5fc22b40505e58de526
font_01_sfnt_off000085fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85FE 4028 bytes
SHA-256: a17c2a746d49ac23b23e38a371e32fddecfcd91b10cf42ff6155bff6b8a07e91
font_02_sfnt_off0000939f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x939F 2788 bytes
SHA-256: 6fd7c7f447d66842f81aa8cf197935b17f22157d0c7e9f95622df1b5b4ddf530
font_03_sfnt_off00009d8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9D8F 17884 bytes
SHA-256: be10e099a7c354b0305597b11d5de042d5d5c0c9f98208c4fce8626ff21c336c

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