Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb4a25ae16bce38a…

MALICIOUS

PDF

39.3 KB Created: 2021-05-30 05:56:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 4297d2b0fee55c26270cfe891cbccb07 SHA-1: 70f8bf062ef4b56f15543fcdf0a12dd370ba381f SHA-256: eb4a25ae16bce38ac92b6c332c9aab4270319e40ab7aed07c3cfee3d43ba6360
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links that redirect to malicious infrastructure, specifically advertising game hacks and free spins. The ML classifier also flagged this PDF as malicious. The embedded URLs and the heuristic firings strongly suggest a phishing or scam attempt designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8140

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 https://netcdn.xyz/app/406889139/get-free-spins-coin-master-game-hack In PDF document text
    • https://ths-academy.net/wp-content/uploads/fsqm-files/free-robux-kid-friendly-no-human-verification_GM431946152.pdfIn PDF document text
    • https://ths-academy.net/wp-content/uploads/fsqm-files/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://ths-academy.net/wp-content/uploads/fsqm-files/free-tiktok-coins_GM835599320.pdfIn PDF document text
    • https://ths-academy.net/wp-content/uploads/fsqm-files/minecraft-toys-for-free_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00003481.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3481 25168 bytes
SHA-256: 96678a87dea55974e589198277a56392769f406474ac760a3e0b9c5f0e6b645c
font_01_sfnt_off00006df2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DF2 3264 bytes
SHA-256: d66c4080ae284a9b4c30992c5983191aaa0a3e32d3a7f70f5d4649bf393320ef
font_02_sfnt_off0000793d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x793D 17884 bytes
SHA-256: b0210710b9f532dde69bab3e54691bd54d84b0d7d990975f20826afd1ba27450

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