Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b202f2f6bd12acd…

MALICIOUS

PDF

30.2 KB Created: 2021-07-19 00:56:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 569ba9ad5f97de18fdb34e85c096b3d4 SHA-1: 6a817284eff8a5862c87c0c1b23b140fefe130ce SHA-256: 5b202f2f6bd12acd9fedc6a746d4c3097030d817d61a44b0743d6fd12c398b5d
160 Risk Score

Malware Insights

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

The PDF contains multiple links to redirector domains that are known to host malicious content, specifically lures for game hacks and free currency. The document body and heuristics indicate a clear intent to trick users into clicking these links, likely leading to further malicious downloads or exploits. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9407

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/codes-to-get-free-robux-game-hack In PDF document text
    • http://algierimasonry.com/images/minecraft-java-edition-free-download_GM479516143.pdfIn PDF document text
    • http://algierimasonry.com/images/free-tiktok-like_GM835599320.pdfIn PDF document text
    • http://algierimasonry.com/images/roblox-hack_GM431946152.pdfIn PDF document text
    • http://algierimasonry.com/images/free-tiktok-video_GM835599320.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_off00002018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2018 23320 bytes
SHA-256: cf3a8525ab1b309cafd1599ebb63923bd6cb77c02aa005768d5a7c622a541c0e
font_01_sfnt_off000053be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x53BE 18480 bytes
SHA-256: d8df780dd9152f792ca5811d4d2bf8cc7bec42c2ad4f1fc57a29b955cb4b066b

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