Malicious PDF — malware analysis report

Static analysis result for SHA-256 0138de3fa9a1c9f9…

MALICIOUS

PDF

38.7 KB Created: 2021-05-21 14:44:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: edf06ce0917f9d8341ac54df828d456f SHA-1: 539054bb124ce4c9af75b62ebb6839984b6ef342 SHA-256: 0138de3fa9a1c9f93dff3a23e5ecdd351b7f03754b4cc822d43424a217f4f66f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links pointing to known malicious redirector infrastructure, disguised as free game-related content. The document body explicitly mentions 'Free Private Server Roblox' and includes a 'CLICK HERE TO ACCESS ROBLOX GENERATOR' call to action, reinforcing the lure. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9476

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/431946152/free-private-server-roblox-game-hack In PDF document text
    • http://www.mieczewo.com/images/free-minecraft-codes_GM479516143.pdfIn PDF document text
    • http://www.mieczewo.com/images/como-hackear-el-juego-coin-master-en-espaol_GM406889139.pdfIn PDF document text
    • http://www.mieczewo.com/images/earn-free-robux_GM431946152.pdfIn PDF document text
    • http://www.mieczewo.com/images/play-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • http://www.mieczewo.com/images/free-minecraft-worlds_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_off000034a0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x34A0 27736 bytes
SHA-256: 64fcc790d675cb23e376fab7a3b3ae70939af7c5e49bda6de3dd89090aaf018b
font_01_sfnt_off00007519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7519 18668 bytes
SHA-256: 0c1ebf4725aa76ec92a53ac4eb5ef555557a7fe73d781563fc2c7a2c487d54c6

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