Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6dfd043f9f75acb…

MALICIOUS

PDF

32.0 KB Created: 2021-07-19 08:31:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 5b24f32b5341417d9f5becac7bbce15b SHA-1: 94dbe0c848010571057729db0bea7a8813f9b9e4 SHA-256: f6dfd043f9f75acb74a46917e9382c602f0ee59b9a1c10e1d3c4171327bbf415
160 Risk Score

Malware Insights

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

This PDF document contains multiple links that redirect to malicious infrastructure, specifically advertising 'free Robux generators' and 'game hacks'. The ML classifier also flagged this PDF as malicious. The primary attack pattern involves luring users to click these links, likely leading to further malware downloads or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9445

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/how-to-get-free-robux-without-verifying-2021-game-hack In PDF document text
    • https://razredna-nastava.net/files/minecraft-free-apk_GM479516143.pdfIn PDF document text
    • http://razredna-nastava.net/files/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/how-do-i-get-free-robux_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/real-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/free-robux-games_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_off000025d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25D7 21816 bytes
SHA-256: 14d2c61faf85b58c5effbc1dbeb07c68fd80b0e02403318596512815343aaea7
font_01_sfnt_off000055f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x55F8 19956 bytes
SHA-256: 0d7f08528f83f97708517a405845162dd759fca1405e28936b51461a2b6f80d9

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