Malicious PDF — malware analysis report

Static analysis result for SHA-256 dde5b0caa62db571…

MALICIOUS

PDF

34.3 KB Created: 2021-05-21 00:47:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: e63d2e1b2e1cb9edc528df1e9aa0a577 SHA-1: f0afdbf8ebc6887500be977747a1f69386ea1f70 SHA-256: dde5b0caa62db571df81381e46932fe43b96c51d67999e01b974ddcbd3360dc2
168 Risk Score

Malware Insights

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

The PDF document contains multiple embedded links that redirect to malicious infrastructure, specifically advertising free TikTok accounts and game hacks. The document body and heuristics indicate a lure designed to entice users to click these links, which are known malicious redirectors. The ML classifier also flagged this PDF as malicious, increasing confidence in its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9508

Heuristics 5

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/835599320/free-tiktok-accounts-game-hack In PDF document text
    • http://heilzentrum-ulm.de/images/roblox-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/how-to-get-minecraft-pocket-edition-for-free_GM479516143.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/roblox-com-free_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-robux-pastebin_GM431946152.pdfIn PDF document text
    • http://heilzentrum-ulm.de/images/free-robux-com-roblox_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
stream_002_off00003003.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3003 24072 bytes
SHA-256: e9e656fccc94f563f252ed53e8601916eb3fcf82da45b2dbe602882250869cfe
font_01_sfnt_off000066d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66D2 17596 bytes
SHA-256: 78bf98ee26562f259e5df0f7ea395c63cf95895c72ff2901d5340c85fa588773

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