Malicious PDF — malware analysis report

Static analysis result for SHA-256 53ee2b4e2a0efdb0…

MALICIOUS

PDF

32.0 KB Created: 2021-07-19 09:10:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 73c8878550ad38dc999685e6f8d59c2b SHA-1: 65640e72e5f961fb18330013c7ea21ce3b4d53f6 SHA-256: 53ee2b4e2a0efdb0fea2dc589324e3f7471cd3fe4817f3e0f8c5c791da6d35c7
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains multiple links to known malicious redirectors, disguised as a 'free generator' or 'game hack' lure. The primary malicious URL identified is http://netcdn.tw/app/406889139/daily-free-spins-for-coin-master-game-hack, which leads to further malicious PDF files. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9466

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/daily-free-spins-for-coin-master-game-hack In PDF document text
    • http://rzt.com.ua/images/roblox-studio-free-robux_GM431946152.pdfIn PDF document text
    • http://rzt.com.ua/images/minecraft-hacks-wurst_GM479516143.pdfIn PDF document text
    • http://rzt.com.ua/images/free-minecraft-bedrock_GM479516143.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_off0000269a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x269A 23400 bytes
SHA-256: a70971caf372e1f104f9340695dac144f31fd353b4e238aeb0e536aca98f7bf5
font_01_sfnt_off00005baf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5BAF 18308 bytes
SHA-256: b750d5a8b44caccc122b2ff8294eb9307e18e87e3916697a2a7f0c063c77f291

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