Malicious PDF — malware analysis report

Static analysis result for SHA-256 42e9fb2a15603622…

MALICIOUS

PDF

34.3 KB Created: 2021-06-29 00:57:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: abd4eb22bbea9be412cc8f5270bcd7d1 SHA-1: 54685c4b32d83b7a68096a95f11e9e79568ac5c0 SHA-256: 42e9fb2a156036224d4a25f36304dfa31a8efc2ba5d1e858e77b6f4bda80c70b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded URLs and text that lure users with promises of free items for popular games like Roblox and Coin Master. The primary external URI, http://netcdn.co/app/431946152/create-free-clothes-on-roblox-game-hack, suggests the document is designed to facilitate the download of a secondary payload. The ML classifier strongly flagged this PDF as malicious, supporting the suspicious nature of the content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/create-free-clothes-on-roblox-game-hack In PDF document text
    • https://fib.ub.ac.id/sac/repository/free-spins-on-coin-master-cheat_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/coin-master-firebird-card-free_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/coin-master-hack-2021-link_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-to-change-your-face-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/free-robux-no-verification-required_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-items-on-roblox-in-a-game_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/coin-master-free-spin-realme-products_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-roblox-dresses_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/roblox-retrieve-hacked-account_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/i-didnt-get-my-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/coin-master-free-spins-hack-but-no-surveys_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/roblox-hacks-bubble-gum_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/coin-master-hack-apk-with-fb-login_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-robux-promo-codes-2021-not-expired-november_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/coin-master-hack-tool-for-pc_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/sb-game-hacker-coin-master_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/coin-master-free-coins-and-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/coin-master-hack-apk-link_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-to-get-hacks-on-minecraft_GM479516143.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_off00002ef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EF5 22652 bytes
SHA-256: a8906e9d4b5cbb01025c66132395849b56754e05676572a33d6142a40e1eda20
font_01_sfnt_off0000619a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x619A 18920 bytes
SHA-256: 910b54569ccd9908acd8b291a8e623fd002ca456605037f7b2e9a71fee5887a7

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