Malicious PDF — malware analysis report

Static analysis result for SHA-256 d247dfd4b3350dcd…

MALICIOUS

PDF

24.3 KB Created: 2021-05-24 11:00:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: f6e320123a5642807a8b2f40a348f303 SHA-1: 0641cf3b76156560371c3c78df43430132eb1209 SHA-256: d247dfd4b3350dcdd63e06d1905c887a2f676199972e308e7ff5a5f73a7a49ca
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites that are flagged as malicious redirectors, specifically promoting 'free generators' for popular games. The ML classifier also identified this PDF as malicious. The embedded links likely serve as a lure to download further malware or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8887

Heuristics 3

  • 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.
  • 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/406889139/get-free-spins-coin-master-game-hack In PDF document text
    • http://libertad74.com/images/roblox-hack-apk_GM431946152.pdfIn PDF document text
    • http://libertad74.com/images/free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • http://libertad74.com/images/try-minecraft-free_GM479516143.pdfIn PDF document text
    • http://libertad74.com/images/free-robux-generator-no-verification_GM431946152.pdfIn PDF document text
    • http://libertad74.com/images/minecraft-hack-2021_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000311f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x311F 20330 bytes
SHA-256: 5b5876bbd2895f4991b1792d93e74716d21fae2bad04a0e0e9d0932bf58bd251

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