Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ea175073cdac8a6…

MALICIOUS

PDF

46.6 KB Created: 2021-05-17 08:32:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: af23fe5e006cc67d7c1dd78e4ac2f01b SHA-1: 9b564543b22ccbda75cbe84e94b32d1f3bfc127c SHA-256: 4ea175073cdac8a66e825e3e01dcb97d1479ba96281da55430013e19a406683d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, disguised as "game hacks" or "free Robux" lures. The primary malicious URL identified is https://netcdn.xyz/app/431946152/roblox-com-hack-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a social engineering attack aimed at tricking users into visiting malicious sites, likely for further payload delivery or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

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/roblox-com-hack-game-hack In PDF document text
    • https://silvterie.com.br/images/ckfinder/files/coin-master-cracked-apk-free-download_GM406889139.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/how-to-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/free-coin-master-spins-blog_GM406889139.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/coin-master-free-daily-spins-link_GM406889139.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/coin-master-free-spins-no-generator_GM406889139.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/youtube-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/how-to-get-free-roebucks_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/who-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/minecraft-free-no-virus_GM479516143.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/real-free-robux-codes_GM431946152.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/i-need-robux_GM431946152.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/free-robux-gen_GM431946152.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/free-robux-com-real_GM431946152.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/coin-master-free-spin-trick_GM406889139.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/coin-master-claim-free-spins_GM406889139.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/free-coins-coin-master-blog_GM406889139.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/how-to-get-free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/mcpe_GM479516143.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_off000047d2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47D2 27476 bytes
SHA-256: 1f0d1f4e4844b72f86775b3d5368140543b9d14555a6fb65841a2ffc4b8f33f1
font_01_sfnt_off00008695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8695 5596 bytes
SHA-256: 9a13c2580265a78e8a7257496a31ee0055738af7e20a5661c2902efe4bf05ce5
font_02_sfnt_off0000933d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x933D 18440 bytes
SHA-256: 998502f3d31251ba6a8b9f896cebf55eeafd88011b242c250778658ce2e0bbe6

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