Malicious PDF — malware analysis report

Static analysis result for SHA-256 553f87fb521afd6c…

MALICIOUS

PDF

42.0 KB Created: 2021-05-16 19:30:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: f17ac2dfa079e28b6d04bb03f3ac4c19 SHA-1: d9d1d36aba5bea1121f1def7ca1b244be7c28a1b SHA-256: 553f87fb521afd6cefd7e85f2e6a6799b7c4c614c799178e87338a511287b804
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links pointing to known malicious redirector infrastructure, specifically targeting users with lures for game-related cheats and currency. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms the malicious nature of these links. While no scripts were extracted, the document body and embedded links strongly suggest a phishing or scam attempt designed to lead users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/how-to-get-free-coins-on-coin-master-hack-game-hack In PDF document text
    • http://www.3d-gold.com.hk/upload/files/roblox-girl-avatar_GM431946152.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/free-robux-earn_GM431946152.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/easy-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/roblox-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/apps-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/coin-master-rewards-app_GM406889139.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/roblox-fly-hack_GM431946152.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/how-to-get-free-robux-games_GM431946152.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/free-robux-no-verify_GM431946152.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/roblox-its-free_GM431946152.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/cute-free-hair-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/coin-master-daily-rewards-link_GM406889139.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/how-to-hack-roblox-games_GM431946152.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/coin-master-free-spins-link-2021-ios_GM406889139.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/how-do-you-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/real-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/coin-master-unlimited-spin-hack-apk_GM406889139.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/robux-app_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_003_off00004a2e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A2E 24636 bytes
SHA-256: 8e10d2aa6bdb9bee2b1a1a51a2d8f01af5242ec802d21b730ddfffab789df1d5
font_01_sfnt_off0000828e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x828E 18044 bytes
SHA-256: 8c08c70171ded8116d72ec6b9f41602b425c47027f7aa83ef766cc7ef1375634

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