Malicious PDF — malware analysis report

Static analysis result for SHA-256 bac791025c2620a1…

MALICIOUS

PDF

32.1 KB Created: 2021-07-20 15:20:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: e4bc33028796c4c6f3a6641f193eab99 SHA-1: d11880da0eab8ea139d1fbcb2dc7f4cc25a3c7a4 SHA-256: bac791025c2620a1b1c15d47736ec82fda577e0697421c0887958b923726f26c
160 Risk Score

Malware Insights

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

The PDF document contains multiple links to known malicious redirectors, disguised as "free generators" or "game hacks" for popular games and services. The primary malicious link identified is http://netcdn.tw/app/835599320/buy-tiktok-followers-free-game-hack, which is flagged as a malicious redirector. The document body and embedded URLs suggest a social engineering lure to trick users into visiting these sites, likely leading to further malware downloads or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9900

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/buy-tiktok-followers-free-game-hack In PDF document text
    • https://diendientuvn.com/public/upload/files/free-tiktok-accounts-with-followers_GM835599320.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/roblox-hack-game_GM431946152.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/how-to-get-minecraft-java-edition-for-free_GM479516143.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/can-you-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/create-minecraft-server-free_GM479516143.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/minecraft-marketplace-free_GM479516143.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/free-robux-discord_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_off00002a4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A4B 22144 bytes
SHA-256: 4583495d41cd895da899fa35a1efafe572493189080a5d66c02327bdccdfa1cf
font_01_sfnt_off00005b79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B79 18232 bytes
SHA-256: 961899ff1eb424bdaf12ead7fcaccf2d09ae623c60a9c1ffe8485e19a18d4dd1