Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fa8dc3fac742427…

MALICIOUS

PDF

33.9 KB Created: 2021-07-20 12:50:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 0b7738530d400f7eda3cb31b3c58c88d SHA-1: 2e826c6e8a7911458b0fc5305a7533fefc81bd29 SHA-256: 5fa8dc3fac7424278f2a9adade6caf0e20fee7c225ffdc7dbe8c7ccba8608e46
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically advertising 'free Robux' or game hacks. The primary lure URL is http://netcdn.tw/app/431946152/free-robux-codes-2021-not-used-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a social engineering tactic to drive users to potentially malicious websites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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-2021-not-used-game-hack In PDF document text
    • https://feuerwehr-rheinau.de/images/free-robux-gift-card_GM431946152.pdfIn PDF document text
    • https://feuerwehr-rheinau.de/images/huskybuckscom-free-robux_GM431946152.pdfIn PDF document text
    • https://feuerwehr-rheinau.de/images/coin-master-claim-free-spins_GM406889139.pdfIn PDF document text
    • https://feuerwehr-rheinau.de/images/minecraft-apk-download-v1-144-2-free_GM479516143.pdfIn PDF document text
    • https://feuerwehr-rheinau.de/images/rblx-city-free-robux_GM431946152.pdfIn PDF document text
    • https://feuerwehr-rheinau.de/images/minecraft-free-play-no-download_GM479516143.pdfIn PDF document text
    • https://feuerwehr-rheinau.de/images/free-minecraft-maps_GM479516143.pdfIn PDF document text
    • https://feuerwehr-rheinau.de/images/free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://feuerwehr-rheinau.de/images/earn-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://feuerwehr-rheinau.de/images/daily-free-spins-coin-master_GM406889139.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_off00002ac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2AC7 23644 bytes
SHA-256: 468661a7e7b651f88d167e524005f3c3fc33c4af8d0fd9f56b160fa0448d1294
font_01_sfnt_off00006053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6053 18880 bytes
SHA-256: 342a41804753b243bf13fa7c19db71c7debbb8fa80f4750c82899b0ccf7aa343