Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f28d2291940c8eb…

MALICIOUS

PDF

45.1 KB Created: 2021-06-03 10:17:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: e73550f2754038d5ce2213ae99866623 SHA-1: fb47865329264faad4aead3eff061c866523bf3a SHA-256: 5f28d2291940c8ebb037105054b41f2a6a19d7bfa65ea4c982e62ab906015638
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting "free Robux" or game hacks. The ML classifier also flagged this PDF as malicious. While no scripts were extracted, the embedded links and the nature of the lure strongly suggest a phishing or scam attempt, likely leading to further malware download or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.online/app/431946152/actual-free-robux-game-hack In PDF document text
    • http://lib.kunci.or.id/repository/free-spin-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/how-to-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/are-tiktok-free-views-without-verification_GM835599320.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/roblox-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/rbl-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-coin-master-cheats_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-spins-coin-master-links-app_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-robux-generator-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/roblox-avatar-girl_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/roblox-group-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/coin-master-hack-org_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/robux-free-co_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/coin-master-free-spins-fb_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/minecraft-online-free-download_GM479516143.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/roblox-hack-codes_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/how-do-you-install-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/pokemon-go-free-roam_GM1094591345.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/easy-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/how-to-get-free-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
font_00_sfnt_off00004ed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4ED9 26832 bytes
SHA-256: cd1dde2085c149edb3dfa7369ede2d8c517e7c37e8dd0230aeec91f1eb224ead
font_01_sfnt_off00008d4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D4B 18420 bytes
SHA-256: 37b67a04c59087902b42b65f26bec20808041b5185ddbc4d4c9e15973e68d0ef

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