Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f072b7cde75faba…

MALICIOUS

PDF

45.3 KB Created: 2021-06-09 15:53:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 5aa7178c407779a29f2f517395e9ad15 SHA-1: 4fe4f62f588ae62fa095d3752eafc34179dfea64 SHA-256: 8f072b7cde75faba72a3ba5999c72d7241baa43234cbc587fb2c76426a24dfdc
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains links that redirect to malicious infrastructure, specifically promoting 'free generator / game hack' lures. The presence of multiple embedded URLs and the ML classifier's high confidence score indicate a malicious intent to trick users into visiting potentially harmful sites. No scripts were extracted, but the document's structure and embedded links strongly suggest a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.tw/app/431946152/free-shirts-roblox-catalog-game-hack In PDF document text
    • https://fib.ub.ac.id/sac/repository/free-robux-cheats-roblox_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-can-we-earn-free-robux-in-roblox_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-roblox-outfits-2021_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/coin-master-hack-355_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/haktuts-coin-master-free-spin-link-today_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/cheat-engine-roblox-bypass-download_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-robux-just-enter-username-and-password_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/what-is-a-robux_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-to-hack-roblox-on-mobile_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-do-you-make-clothes-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/coin-master-free-cards-link-2021_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/how-do-you-earn-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/coin-master-hack-link-2021_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/robux-for-surveys_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/rbx-free_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/how-to-hack-roblox-accounts-for-robux_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/link-for-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-robux-with-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/coin-master-hack-generator-tool_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/coin-master-hack-to-get-free-spins_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
stream_004_off00004fea.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FEA 26468 bytes
SHA-256: d5d8775e94979d4258de9f9650f042b7f1b4af8844ebe819891afbeb3c748986
font_01_sfnt_off00008ca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CA6 18856 bytes
SHA-256: e826a9741d0eaf38b8021bdc402857cb3a2cd5af307318a4bcb1a4f579731403

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