Malicious PDF — malware analysis report

Static analysis result for SHA-256 b93b5bf18a654383…

MALICIOUS

PDF

33.6 KB Created: 2021-07-19 07:51:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 0c6f314c5084acaff53336a7a269d645 SHA-1: 3c95e651efcde1cf00ed22155b30a0d9f07f9cae SHA-256: b93b5bf18a654383a9556189a3ecf4a353fbb8af6ef34e31aa5b7cc26075ad6b
160 Risk Score

Malware Insights

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

The PDF contains multiple links designed to lure users with promises of free in-game items or hacks, such as 'free tiktok followers' and 'free robux'. These links predominantly redirect to malicious infrastructure, specifically the URL http://netcdn.tw/app/835599320/free-tiktok-followers-no-human-verification-or-survey-2021-game-hack, which is flagged as a known malicious redirector. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest an attempt to exploit user interest in free items to drive them to malicious sites, likely as part of a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9498

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-followers-no-human-verification-or-survey-2021-game-hack In PDF document text
    • http://www.sbairs.com/datas/files/free-robux-for-kids_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/is-minecraft-free-on-xbox_GM479516143.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/free-spins-coin-master-blogspot_GM406889139.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/will-minecraft-dungeons-be-free_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_off00002ba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2BA3 22992 bytes
SHA-256: 4e05f3a01038e290dc7f9428b2034af9e3e95bd6b82cf9e7efd3be689cdc177f
font_01_sfnt_off00005f08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F08 19152 bytes
SHA-256: c6aae516a535c20688ad74e4aa12997c302b82eea592ee03757e951f101f6a27

Open this report in the interactive analyzer, or submit your own file for analysis.