Malicious PDF — malware analysis report

Static analysis result for SHA-256 18a4bcd6650a7408…

MALICIOUS

PDF

35.4 KB Created: 2021-07-20 13:23:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 6aa80e0df09b824d8009b27c52174682 SHA-1: 7735de6a3dcda50dc41a3b16c86fe20c425841f0 SHA-256: 18a4bcd6650a740830f34bb0c455bd7aa4796e5a06c774c5260fc4f518d5663e
160 Risk Score

Malware Insights

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

This PDF document contains multiple links to known malicious redirector infrastructure, specifically http://netcdn.tw/app/835599320/free-tiktok-hearts-game-hack. The document body and embedded links suggest a lure for free game hacks or generators, likely intended to trick users into downloading further malware or visiting phishing sites. No scripts were extracted, but the PDF structure and embedded URLs strongly indicate a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/835599320/free-tiktok-hearts-game-hack In PDF document text
    • https://www.kaojen.com.tw/upload/files/minecraft-free-download-pc_GM479516143.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/minecraft-ps4-free_GM479516143.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/free-tiktok-fans-no-verification_GM835599320.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/minecraft-realms-free-trial_GM479516143.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/coin-master-free-2021-spin-link_GM406889139.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/free-robux-hacker-us_GM431946152.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/tiktok-followers-for-free_GM835599320.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/roblox-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/how-to-get-free-robux-on-phone_GM431946152.pdfIn PDF document text
    • https://www.kaojen.com.tw/upload/files/how-to-get-robux-for-free-2021_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_off000036a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x36A7 23184 bytes
SHA-256: a998ff692c492978e293b15c344261a2d3e166d5a794af4df41948c0eb640ee4
font_01_sfnt_off00006a7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A7F 17684 bytes
SHA-256: d2d02d8ba990aafabbf3c8139bcf1f40ce6ab80109d0e8cf226d19766131c391

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