Malicious PDF — malware analysis report

Static analysis result for SHA-256 a13200092dd03e47…

MALICIOUS

PDF

35.8 KB Created: 2021-05-24 00:09:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 3a8ee8b4fc9dbeefed124daf8e8f92ce SHA-1: d54049b3715018b674abd67bb277f6224790a554 SHA-256: a13200092dd03e472b48cf1b6e832a86f0db2db7f4ac4974b16dd06eaef93467
160 Risk Score

Malware Insights

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

The PDF contains multiple links to redirectors and lures users with a "Coin Master Hack 2021" theme, aiming to trick them into clicking a malicious link. The ML classifier also flagged this PDF as malicious. The document body and heuristics indicate a redirection to potentially malicious infrastructure, likely for further payload delivery or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9492

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-hack-2021-game-hack In PDF document text
    • http://www.htc.edu.au/images/how-to-get-free-robux-com_GM431946152.pdfIn PDF document text
    • http://www.htc.edu.au/images/coin-master-free-spins-link-download-hack_GM406889139.pdfIn PDF document text
    • http://www.htc.edu.au/images/how-to-o-get-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://www.htc.edu.au/images/how-to-get-minecraft-for-free-on-ps4-2021_GM479516143.pdfIn PDF document text
    • http://www.htc.edu.au/images/coin-master-spin-link-today_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_002_off00003394.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3394 24568 bytes
SHA-256: 0a440ba1fd4d3c8c984679104ef0d528f5e68e689cde9ebbc9ee91f7f595a249
font_01_sfnt_off00006b15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B15 18116 bytes
SHA-256: 17974cef81917e5ef69542194afa433aff210173cc902887fbc2b56a9328dd03

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