Malicious PDF — malware analysis report

Static analysis result for SHA-256 0aa26b35f3a66eb4…

MALICIOUS

PDF

44.2 KB Created: 2021-05-10 13:23:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 51b8f6af43d264b1e635499e233b675d SHA-1: 63b288ec414112e2fb518aa2550be28dcbb82556 SHA-256: 0aa26b35f3a66eb40198559a965285d6e12f9bd77aa22b505f343f153cbafd4b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, masquerading as game hacks or generators. The primary lure URL is https://netcdn.xyz/app/431946152/what-games-on-roblox-give-you-free-robux-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a social engineering attack aimed at tricking users into visiting malicious sites, likely for further exploitation or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

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 https://netcdn.xyz/app/431946152/what-games-on-roblox-give-you-free-robux-game-hack In PDF document text
    • https://silvterie.com.br/images/ckfinder/files/make-robux_GM431946152.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/is-there-a-free-version-of-minecraft_GM479516143.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/coin-master-hack-pro-gamers-com_GM406889139.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/free-spins-and-coins-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/get-free-robux_GM431946152.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/how-to-download-minecraft-for-free-on-mac_GM479516143.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/coin-master-free-link-today_GM406889139.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/coin-master-hack-apk-2021-download_GM406889139.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/robux-codes_GM431946152.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/coin-master-reward-link_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00003f7c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3F7C 26060 bytes
SHA-256: 8d1cd654a5b135e0142a2b18922f794a5f8778e1d544f3336eb520cd78257175
font_01_sfnt_off00007aee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7AEE 3884 bytes
SHA-256: 40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf
font_02_sfnt_off00008795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8795 19440 bytes
SHA-256: d075b9cdfa29af0d09f3a3e5cc134cf400d7d34255e3ca0094b6ab529e7e4150

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