Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd637f31ecce174c…

MALICIOUS

PDF

33.2 KB Created: 2021-07-21 05:29:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 3722d8dfb748b9a1901a9cf9ea7e98b9 SHA-1: 277a7ed3a4a99ed7068ae8e21fa06640cf326661 SHA-256: fd637f31ecce174c3af9b9456fac31ed05301b4cca0dda6b6611dc4eaf8bc817
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one to a known malicious redirector infrastructure at http://netcdn.tw/app/431946152/free-robux-codes-no-verification-game-hack. This lure is designed to trick users into believing they can obtain free game currency or hacks. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful sites. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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/431946152/free-robux-codes-no-verification-game-hack In PDF document text
    • https://www.biancolatte.it/wp-content/uploads/fsqm-files/free-tiktok-followers-app_GM835599320.pdfIn PDF document text
    • https://www.biancolatte.it/wp-content/uploads/fsqm-files/free-robux-discord_GM431946152.pdfIn PDF document text
    • https://www.biancolatte.it/wp-content/uploads/fsqm-files/how-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://www.biancolatte.it/wp-content/uploads/fsqm-files/minecraft-bedrock-edition-download-pc-free_GM479516143.pdfIn PDF document text
    • https://www.biancolatte.it/wp-content/uploads/fsqm-files/free-college-textbooks-tiktok_GM835599320.pdfIn PDF document text
    • https://www.biancolatte.it/wp-content/uploads/fsqm-files/free-coins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.biancolatte.it/wp-content/uploads/fsqm-files/minecraft-free-download_GM479516143.pdfIn PDF document text
    • https://www.biancolatte.it/wp-content/uploads/fsqm-files/free-tiktok-likes-without-verification_GM835599320.pdfIn PDF document text
    • https://www.biancolatte.it/wp-content/uploads/fsqm-files/robux-free-2021_GM431946152.pdfIn PDF document text
    • https://www.biancolatte.it/wp-content/uploads/fsqm-files/minecraft-name-tag-hacks_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_off00002c9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C9A 22128 bytes
SHA-256: 8ac67ba59cc05a9f74276d8b9a68b6d44cc79b04cec64dcbbf92631c5df8a552
font_01_sfnt_off00005dbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DBE 18960 bytes
SHA-256: 00250e694043ebffaca11e4ec466944426d6bb48092c9826d9b6a7a369e0a422

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