Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f728a440bdd1b75…

MALICIOUS

PDF

36.8 KB Created: 2021-07-07 17:59:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: cc8cd1dd6da317d1e4f49bbf2f136478 SHA-1: 8172adf6299fdac70a60649e0638b43438046e1b SHA-256: 1f728a440bdd1b75a13992ef66681bac743ce159235b2bfe5bf5b3505206be29
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple links to a known malicious redirector infrastructure, specifically advertising 'Coin Master Free Spins Apk 2021' and related game hacks. The document body and heuristics indicate a lure designed to trick users into clicking these links, which likely leads to the download of a second-stage payload or further phishing content. No scripts were extracted, but the PDF structure and embedded URLs strongly suggest exploitation for client execution.

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.tw/app/406889139/coin-master-free-spins-apk-2021-game-hack In PDF document text
    • http://belajar.man2balangan.sch.id/__statics/gudangsoal/files/robux-online_GM431946152.pdfIn PDF document text
    • http://belajar.man2balangan.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-without-verification-or-surveys_GM431946152.pdfIn PDF document text
    • http://belajar.man2balangan.sch.id/__statics/gudangsoal/files/how-to-get-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://belajar.man2balangan.sch.id/__statics/gudangsoal/files/how-to-download-minecraft-windows-10-edition-for-free_GM479516143.pdfIn PDF document text
    • http://belajar.man2balangan.sch.id/__statics/gudangsoal/files/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://belajar.man2balangan.sch.id/__statics/gudangsoal/files/roblox-how-to-kick-players-with-cheat-engine_GM431946152.pdfIn PDF document text
    • http://belajar.man2balangan.sch.id/__statics/gudangsoal/files/roblox-avatar-girl_GM431946152.pdfIn PDF document text
    • http://belajar.man2balangan.sch.id/__statics/gudangsoal/files/is-it-possible-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://belajar.man2balangan.sch.id/__statics/gudangsoal/files/minecraft-free-online-games_GM479516143.pdfIn PDF document text
    • http://belajar.man2balangan.sch.id/__statics/gudangsoal/files/how-to-play-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • http://belajar.man2balangan.sch.id/__statics/gudangsoal/files/master-coin-free-spin_GM406889139.pdfIn PDF document text
    • http://belajar.man2balangan.sch.id/__statics/gudangsoal/files/free-hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • http://belajar.man2balangan.sch.id/__statics/gudangsoal/files/links-for-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://belajar.man2balangan.sch.id/__statics/gudangsoal/files/free-roblox-scripts_GM431946152.pdfIn PDF document text
    • http://belajar.man2balangan.sch.id/__statics/gudangsoal/files/free-money-links-coin-master_GM406889139.pdfIn PDF document text
    • http://belajar.man2balangan.sch.id/__statics/gudangsoal/files/www-free-robux-com_GM431946152.pdfIn PDF document text
    • http://belajar.man2balangan.sch.id/__statics/gudangsoal/files/coin-master-hack-no-root_GM406889139.pdfIn PDF document text
    • http://belajar.man2balangan.sch.id/__statics/gudangsoal/files/roblox-highschool-free-money_GM431946152.pdfIn PDF document text
    • http://belajar.man2balangan.sch.id/__statics/gudangsoal/files/how-to-hack-any-roblox-account_GM431946152.pdfIn PDF document text
    • http://belajar.man2balangan.sch.id/__statics/gudangsoal/files/coin-master-spin-link-today_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3888 22940 bytes
SHA-256: aa23fd46220b351bf9546d10b8baf691ec693e6392fb18da646b74e2f6e45683
font_01_sfnt_off00006bf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BF9 18748 bytes
SHA-256: 5e77ef61f71b9edceb1db79b59856649b40968d05cf737e8f2ff8c48d385844d

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