Malicious PDF — malware analysis report

Static analysis result for SHA-256 529f62fbd5f7a58c…

MALICIOUS

PDF

32.1 KB Created: 2021-07-24 16:53:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 1d6e7bc986b8d0c9110fc1b624a0f751 SHA-1: 5267c445882e5a676bfe9c2b8aff47957cfff8aa SHA-256: 529f62fbd5f7a58cee901e2be955408b4a3773f103b3c82fc32df718185fb360
180 Risk Score

Malware Insights

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

The PDF document contains a lure for a "free generator / game hack" and links to known malicious redirector infrastructure. The malformed stream length and ML classifier indicate a malicious PDF, likely exploiting a vulnerability to redirect the user. The embedded links suggest an attempt to trick users into visiting malicious sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9900

Heuristics 5

  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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/431946152/free-robux-gift-card-game-hack In PDF document text
    • https://kierowcyhgv.uk/images/how-do-you-hack-roblox_GM431946152.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/how-to-get-free-tiktok-coins_GM835599320.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/free-minecraft-maps_GM479516143.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/freer-tiktok_GM835599320.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/free-daily-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/minecraft-pc-free_GM479516143.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/tiktok-free-views_GM835599320.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/free-minecraft-alt-accounts_GM479516143.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_off0000298b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x298B 21964 bytes
SHA-256: 898ec50004af3556c03f7baedc00515fc4e464feea02f988ea2788efb775055c
font_01_sfnt_off000059b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x59B1 18828 bytes
SHA-256: 78729c347068b784f89b4da62ceff6cf500daa770e236d6afa4f890492c0d67e

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