Malicious PDF — malware analysis report

Static analysis result for SHA-256 eff77d3108f7149d…

MALICIOUS

PDF

47.8 KB Created: 2021-06-04 02:14:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 8aff3cfafa2da7d6adcd9407e1d516f4 SHA-1: f9b264e68dc926745de60567a0de779ea4f93437 SHA-256: eff77d3108f7149d816390fb52d2147e8407cd6c8c95f27e6b5d1331fe5033f3
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains lures for free Robux and game cheats, directing users to external URLs for downloads. The ML classifier flagged this PDF with high confidence, and embedded URIs suggest a download attempt. While no scripts were explicitly extracted, the PDF structure and embedded links indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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/free-robux-giveaway-game-hack In PDF document text
    • http://laboratorium.sman2metro.sch.id/repository/coin-master-free-spins-promo-code_GM406889139.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id//repository/free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id//repository/free-robux-generator-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id//repository/coin-master-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id/repository/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id/repository/when-tiktok-free-will_GM835599320.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id//repository/coin-master-free-link-spin_GM406889139.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id//repository/how-do-you-earn-robux_GM431946152.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id//repository/minecraft-wurst-hacked-client_GM479516143.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id//repository/pubg-770-uc-ne-kadar_GM1330123889.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id/repository/coin-master-apk-hack-32_GM406889139.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id//repository/minecraft-free-education_GM479516143.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id/repository/coin-master-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id//repository/coin-master-spins-gratis_GM406889139.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id//repository/free-roblox-accounts-with-robux-that-work-not-banned_GM431946152.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id//repository/minecraft-pe-016-0-apk-download-free_GM479516143.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id/repository/free-robux-master_GM431946152.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id//repository/robux-best_GM431946152.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id//repository/minecraft-anarchy-server-no-hacks_GM479516143.pdfIn PDF document text
    • http://laboratorium.sman2metro.sch.id/repository/how-to-get-free-robux-on-computer_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004fef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4FEF 25324 bytes
SHA-256: f1dd0a325a47512a792982295738c6ed27d3663bca6dfdba67fbf608da5bb4f3
font_01_sfnt_off0000896e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x896E 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off00009680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9680 18820 bytes
SHA-256: a907981f6338d23acda294c558170907db38f399f16fdb2ca0bc536a0b707f6d

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