Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9158d0c0b840bb3…

MALICIOUS

PDF

35.3 KB Created: 2021-06-26 06:41:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: c5f7685fdc79af496a56356fa7b24fa5 SHA-1: 26f96c3f5131b1fd9971a5514b7aecb3606d3321 SHA-256: b9158d0c0b840bb36b97fc93d13660f40e3e7741b5900600720886e7a2a13853
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that lure users to click on a URL promising free game hacks or generators. This URL, http://netcdn.co/app/431946152/roblox-vip-server-jailbreak-free-game-hack, is identified as a malicious redirector. The document's structure and embedded links suggest an attempt to trick users into visiting potentially harmful websites, likely for credential harvesting or malware distribution.

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/roblox-vip-server-jailbreak-free-game-hack In PDF document text
    • https://fib.ub.ac.id/sac/repository/free-roblox-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/roblox-hacker-shirt-template_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-to-hack-someones-minecraft-account_GM479516143.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/eroblox-promocodes-for-free-robux_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-robux-generator-no-scams_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/coin-master-free-spins-youthnow_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/free-spin-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-daily-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/coin-master-free-daily-spins-2021_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/all-free-offsale-items-on-roblox-wika_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/how-to-get-minecraft-java-edition-for-free_GM479516143.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-to-get-free-robux-easy_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/oprewards-com-roblox_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/roblox-the-guy-who-hacked-the-admin-panel_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-robux-december-2021_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-to-sell-a-tshirt-for-free-on-roblox_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/coin-master-free-soins_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/how-to-get-free-cards-sets-for-coin-master_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/coin-master-games-hack_GM406889139.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_off0000317f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x317F 22440 bytes
SHA-256: ba3c5ccbdc6bb93a061cc3d3600cf62f54e8d6d1a732c37122fdfc204b075799
font_01_sfnt_off0000637a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x637A 19532 bytes
SHA-256: 1b84ada8eff7608e4f9573bebfbf7d1fbd3e4b7f132d65b5c70c4335e09e0f9c

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