Malicious PDF — malware analysis report

Static analysis result for SHA-256 8892e037b6aa4f67…

MALICIOUS

PDF

33.2 KB Created: 2021-07-20 18:33:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 995a5e8d41393e6392ca3fb9edb25cc6 SHA-1: f4c7ddc897f85debc4b84756e59c6cdd51f5b0b5 SHA-256: 8892e037b6aa4f67e921d58e5f0580eb4ddf1f3d7e502f7fd7c3b5a31cb65232
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to known malicious infrastructure, specifically a site offering 'free generator / game hack' content. The document body and heuristics indicate a lure to trick users into clicking these links, likely leading to further malware or phishing. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

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/479516143/free-printable-minecraft-coloring-pages-game-hack In PDF document text
    • http://www.pentathlon.org.tw/data/file/userfiles/files/free-spin-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://www.pentathlon.org.tw/data/file/userfiles/files/how-to-get-free-robux-for-real_GM431946152.pdfIn PDF document text
    • http://www.pentathlon.org.tw/data/file/userfiles/files/minecraft-free-download-chromebook_GM479516143.pdfIn PDF document text
    • http://www.pentathlon.org.tw/data/file/userfiles/files/free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://www.pentathlon.org.tw/data/file/userfiles/files/free-tiktok-likes-without-verification_GM835599320.pdfIn PDF document text
    • http://www.pentathlon.org.tw/data/file/userfiles/files/how-to-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.pentathlon.org.tw/data/file/userfiles/files/www-free-robux_GM431946152.pdfIn PDF document text
    • http://www.pentathlon.org.tw/data/file/userfiles/files/free-minecraft-texture-packs_GM479516143.pdfIn PDF document text
    • http://www.pentathlon.org.tw/data/file/userfiles/files/how-to-hack-a-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://www.pentathlon.org.tw/data/file/userfiles/files/free-robux-hack-generator_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_off00002cb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2CB6 22648 bytes
SHA-256: bb6bdd7e09cf7bfcc431f8b32345d8cc08aa5efa94accb6b826129a9b9f70fc9
font_01_sfnt_off00005f62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F62 18384 bytes
SHA-256: b54cebd8b2bbc40deba01da3a93219bb66384243215780ac353a5f98c97c66c1