Malicious PDF — malware analysis report

Static analysis result for SHA-256 38513fdba6a7a806…

MALICIOUS

PDF

33.4 KB Created: 2021-07-25 19:25:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: d3cc7c1f6c00a982cd884de16eb7c8a1 SHA-1: 7e1403bdda9ba440006c9d1384d73b1cbb9279a0 SHA-256: 38513fdba6a7a806f9c298a28cda8623cbac74353d6cf46740f7c3730394fb31
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a malicious redirector, disguised as a 'free generator' for popular games. The embedded URLs, such as http://netcdn.tw/app/406889139/free-spins-coin-master-2021-game-hack, are designed to lead users to potentially harmful content or further malicious sites. The document body and heuristics indicate a lure for game-related cheats or currency, a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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/free-spins-coin-master-2021-game-hack In PDF document text
    • https://meltonschool.org/images/free-minecraft-codes_GM479516143.pdfIn PDF document text
    • https://meltonschool.org/images/how-to-get-minecraft-realms-for-free_GM479516143.pdfIn PDF document text
    • https://meltonschool.org/images/minecraft-free-download-ios_GM479516143.pdfIn PDF document text
    • https://meltonschool.org/images/minecraft-free-online-games_GM479516143.pdfIn PDF document text
    • https://meltonschool.org/images/how-to-get-minecraft-for-free-on-mac_GM479516143.pdfIn PDF document text
    • https://meltonschool.org/images/how-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://meltonschool.org/images/free-robux-2021_GM431946152.pdfIn PDF document text
    • https://meltonschool.org/images/can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • https://meltonschool.org/images/rblx-gg-free-robux_GM431946152.pdfIn PDF document text
    • https://meltonschool.org/images/how-to-get-free-robux-2021_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
font_00_sfnt_off00002ce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2CE4 23100 bytes
SHA-256: eef099c6bd80a41bbbbf1c03f75b33c2ab4135ad123778b1bf0cfe89054539ee
font_01_sfnt_off000060b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60B0 18288 bytes
SHA-256: 9732707b45c862b7a6ef8ea2418900def9be3650c6b325207d932644f64622ad