Malicious PDF — malware analysis report

Static analysis result for SHA-256 56f23ac044ad791e…

MALICIOUS

PDF

32.2 KB Created: 2021-07-19 11:20:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 7611b6e403bc89ea5875210f143b6247 SHA-1: 30aa6e4829ba0b8f637cd9e3de14aaeefb29cccc SHA-256: 56f23ac044ad791e4c027af531e0e46eddd0c75d3d3b363d0236f4502f02f42a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links and a call-to-action related to free game hacks and currency, strongly suggesting a phishing or scam attempt. The ML classifier also flagged this PDF as malicious. While no scripts were directly extracted, the presence of external URIs and the document's theme indicate an attempt to redirect the user to a malicious site for potential download or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9582

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/431946152/robux-gift-card-free-game-hack In PDF document text
    • https://vireco-online.com/ckfinder/userfiles/files/how-to-start-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://vireco-online.com/ckfinder/userfiles/files/minecraft-mods-download-free_GM479516143.pdfIn PDF document text
    • https://vireco-online.com/ckfinder/userfiles/files/free-tiktok-bots_GM835599320.pdfIn PDF document text
    • https://vireco-online.com/ckfinder/userfiles/files/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://vireco-online.com/ckfinder/userfiles/files/free-robux-no-scam_GM431946152.pdfIn PDF document text
    • https://vireco-online.com/ckfinder/userfiles/files/minecraft-java-edition-free-trial_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
font_00_sfnt_off000027f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27F5 22532 bytes
SHA-256: 9dfdd7ea7e2a887975b001092e900ff968959faeb8940421f19f38d753da50ab
font_01_sfnt_off00005a4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A4C 18828 bytes
SHA-256: bb6ba787686cb78dc8bffd8aa27003d08d9877f569f527752ba86e56c9229aef

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