Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5816f4bf0e25c9d…

MALICIOUS

PDF

30.0 KB Created: 2021-07-19 00:31:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: ef6c6a2691dcc83f7826953d2d44a1af SHA-1: 99f066f4592014c2350eee6fbee83b7b08289c5d SHA-256: f5816f4bf0e25c9dd4edbee942502a8247598268b35c82f85f627502ce9a8491
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to known malicious infrastructure, specifically advertising a 'free Robux generator' and 'game hack'. The document body and heuristics confirm a lure-based attack pattern designed to entice users to click on these malicious links. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8523

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-2021-game-hack In PDF document text
    • http://greenoase.be/images/free-minecraft-servers-to-join_GM479516143.pdfIn PDF document text
    • http://greenoase.be/images/free-robux-easy_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2096 22404 bytes
SHA-256: 0287b58a740442514eda2fe80f3a7d8bc6d608963b8fe81c1d2bcf578b2b54dc
font_01_sfnt_off00005257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5257 18600 bytes
SHA-256: a2c5ceeb34a0fdda65f6d16b67831e7179df071a1f7dc46648d6724acc442c88

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