Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef4c28f792071daa…

MALICIOUS

PDF

36.6 KB Created: 2021-07-03 20:14:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 2a4ebe3af2c529fda612294fbda5444b SHA-1: aaf542147b1d0a3592f19c5ceda6fff9ef3c42dd SHA-256: ef4c28f792071daa6484fe127c215f7e968a6c3efd8a14e3e6a49c0474545d42
160 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, which is designed to lure users into clicking on game hack or generator content. The ML classifier also flagged this PDF as malicious. The embedded URLs suggest a phishing or scam attempt, likely leading to further malware downloads or credential harvesting.

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-game-hack-game-hack In PDF document text
    • https://elearning.min1bangkalan.com/__statics/gudangsoal/files/roblox-skin-free_GM431946152.pdfIn PDF document text
    • https://elearning.min1bangkalan.com/__statics/gudangsoal/files/roblox-cheat-tower-defense_GM431946152.pdfIn PDF document text
    • https://elearning.min1bangkalan.com/__statics/gudangsoal/files/coin-master-free-gold-cards-link_GM406889139.pdfIn PDF document text
    • https://elearning.min1bangkalan.com/__statics/gudangsoal/files/coin-master-hack-app-for-ios_GM406889139.pdfIn PDF document text
    • https://elearning.min1bangkalan.com/__statics/gudangsoal/files/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://elearning.min1bangkalan.com/__statics/gudangsoal/files/coin-master-free-spins-daily-link-updated_GM406889139.pdfIn PDF document text
    • https://elearning.min1bangkalan.com/__statics/gudangsoal/files/free-robux-accounts_GM431946152.pdfIn PDF document text
    • https://elearning.min1bangkalan.com/__statics/gudangsoal/files/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://elearning.min1bangkalan.com/__statics/gudangsoal/files/get-free-tiktok-followers_GM835599320.pdfIn PDF document text
    • https://elearning.min1bangkalan.com/__statics/gudangsoal/files/best-free-roblox-executor_GM431946152.pdfIn PDF document text
    • https://elearning.min1bangkalan.com/__statics/gudangsoal/files/coin-master-hacks-for-iphone_GM406889139.pdfIn PDF document text
    • https://elearning.min1bangkalan.com/__statics/gudangsoal/files/archery-master-3d-coins-hack_GM406889139.pdfIn PDF document text
    • https://elearning.min1bangkalan.com/__statics/gudangsoal/files/free-robux-group_GM431946152.pdfIn PDF document text
    • https://elearning.min1bangkalan.com/__statics/gudangsoal/files/coin-master-32-mod-hack-apk-download_GM406889139.pdfIn PDF document text
    • https://elearning.min1bangkalan.com/__statics/gudangsoal/files/but-link-says-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning.min1bangkalan.com/__statics/gudangsoal/files/roblox-comcom_GM431946152.pdfIn PDF document text
    • https://elearning.min1bangkalan.com/__statics/gudangsoal/files/install-roblox-free-latest-version_GM431946152.pdfIn PDF document text
    • https://elearning.min1bangkalan.com/__statics/gudangsoal/files/roblox-in-free-draw-2-alpha_GM431946152.pdfIn PDF document text
    • https://elearning.min1bangkalan.com/__statics/gudangsoal/files/bux-life-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning.min1bangkalan.com/__statics/gudangsoal/files/free-robux-com-no-verification_GM431946152.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_off00003983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3983 22876 bytes
SHA-256: e9a2c06981c98d59180f4c1e5fd210de75023e2710485395dc6e03a5fc78bb0a
font_01_sfnt_off00006cc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CC8 18264 bytes
SHA-256: c1c21b29a6afb4d06e4d6845aa9afd5500216469eff45eb2d027be7bd9c24dc5

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