Malicious PDF — malware analysis report

Static analysis result for SHA-256 84fe99f0e013c851…

MALICIOUS

PDF

44.9 KB Created: 2021-06-07 10:17:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: d63409d53ded17c38aabb376557e1fcb SHA-1: e74f061c265a25e6bb43d6ceb4a69f5a977ba744 SHA-256: 84fe99f0e013c851be4da86abd3b37183325a0b6fb990d8a1e35f3a47ceb7706
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirector domains, masquerading as game hacks and free item generators to lure users. The primary redirector URL is https://netcdn.tw/app/431946152/free-limited-items-roblox-game-hack, which is associated with malicious activity. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a social engineering attack designed to lead users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.tw/app/431946152/free-limited-items-roblox-game-hack In PDF document text
    • http://dismarinamt.com.br/images/coin-master-hack-app_GM406889139.pdfIn PDF document text
    • http://dismarinamt.com.br/images/coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://dismarinamt.com.br/images/freer-pro-tiktok-fans_GM835599320.pdfIn PDF document text
    • http://dismarinamt.com.br/images/coin-master-free-spins-fb-champion_GM406889139.pdfIn PDF document text
    • http://dismarinamt.com.br/images/how-to-get-free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • http://dismarinamt.com.br/images/minecraft-pe-free-download_GM479516143.pdfIn PDF document text
    • http://dismarinamt.com.br/images/roblox-gift-card-for-free_GM431946152.pdfIn PDF document text
    • http://dismarinamt.com.br/images/free-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://dismarinamt.com.br/images/coin-master-claim-spins_GM406889139.pdfIn PDF document text
    • http://dismarinamt.com.br/images/admin-commands-roblox-hack_GM431946152.pdfIn PDF document text
    • http://dismarinamt.com.br/images/free-robux-co_GM431946152.pdfIn PDF document text
    • http://dismarinamt.com.br/images/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • http://dismarinamt.com.br/images/how-to-get-minecraft-on-chromebook-for-free_GM479516143.pdfIn PDF document text
    • http://dismarinamt.com.br/images/how-to-get-free-clothing-on-roblox_GM431946152.pdfIn PDF document text
    • http://dismarinamt.com.br/images/free-robux-generator-no-survey-no-download-no-human-verification_GM431946152.pdfIn PDF document text
    • http://dismarinamt.com.br/images/free-robux-site_GM431946152.pdfIn PDF document text
    • http://dismarinamt.com.br/images/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://dismarinamt.com.br/images/how-do-you-hack-roblox_GM431946152.pdfIn PDF document text
    • http://dismarinamt.com.br/images/free-robux-hacks-no-verification_GM431946152.pdfIn PDF document text
    • http://dismarinamt.com.br/images/how-to-get-minecraft-dungeons-for-free_GM479516143.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
stream_004_off000052ba.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52BA 24820 bytes
SHA-256: 8fd95cb9ac936f660f8d376c2a3c2830276ee5f07cedd5c1d9fb85d06190ca17
font_01_sfnt_off00008bfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BFC 18604 bytes
SHA-256: f3e34827c1e845c36a309d7c1c3764ef37707d1dd579bd0fc4f5b91c5b8ab33c

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