Malicious PDF — malware analysis report

Static analysis result for SHA-256 3971ad416bc7c91a…

MALICIOUS

PDF

32.8 KB Created: 2021-07-19 20:42:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 89405da81682db2069323f4bf370a697 SHA-1: 643d3bbc018faf300d0a085c20938920d1d7a107 SHA-256: 3971ad416bc7c91aef9275667e4510c361f0f4159d340c2fcfddef100b980a38
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirector infrastructure, specifically promoting 'free Robux' and 'game hacks'. The document body and embedded URLs indicate a social engineering lure designed to trick users into visiting these sites. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript, and the heuristic firings suggest malicious redirection is the primary function.

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/431946152/apps-to-get-free-robux-game-hack In PDF document text
    • http://greenoase.be/images/how-to-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://greenoase.be/images/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://greenoase.be/images/minecraft-bedrock-server-hosting-free_GM479516143.pdfIn PDF document text
    • http://greenoase.be/images/coin-master-fan-page-free-spins_GM406889139.pdfIn PDF document text
    • http://greenoase.be/images/free-robux-easy_GM431946152.pdfIn PDF document text
    • http://greenoase.be/images/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://greenoase.be/images/free-tiktok-fans-and-likes_GM835599320.pdfIn PDF document text
    • http://greenoase.be/images/roblox-pink-free-robux_GM431946152.pdfIn PDF document text
    • http://greenoase.be/images/how-to-get-free-tiktok-coins_GM835599320.pdfIn PDF document text
    • http://greenoase.be/images/free-robux-websites-that-actually-work_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_off00002c6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C6A 22260 bytes
SHA-256: dbfa20017ec872bd1362a3ae990bd2bddad22a0415183668f5e0657e38f4f95a
font_01_sfnt_off00005d9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D9D 18480 bytes
SHA-256: 5adc42e6ee0c4a9aa68860894580334acf05e1ff62bdf9cc2e4be84be310e939