Malicious PDF — malware analysis report

Static analysis result for SHA-256 89fd10997b2fe71a…

MALICIOUS

PDF

34.7 KB Created: 2021-07-09 07:44:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 53f2fb72dd07873ffef30de3bb97af92 SHA-1: 1db3a0913158e1279c3fda33b3ec628ece99ddfa SHA-256: 89fd10997b2fe71a4b51a183eb39aef672e71a8a4b632b61b85925386c47c51d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one to a known malicious redirector infrastructure at http://netcdn.tw/app/431946152/free-robux-without-verification-game-hack. The document body and heuristics indicate a lure for free Robux or game hacks, designed to trick users into clicking the malicious link. No scripts were extracted, but the presence of embedded URLs and the nature of the lure strongly suggest a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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-without-verification-game-hack In PDF document text
    • https://www.stomatoloska-ordinacija-rijeka.com/files/coin-master-hack-spin-link_GM406889139.pdfIn PDF document text
    • https://www.stomatoloska-ordinacija-rijeka.com/files/coin-master-hack-spin-generator-tool_GM406889139.pdfIn PDF document text
    • http://stomatoloska-ordinacija-rijeka.com/files/roblox-noscope-sniping-hack-v3rmillion_GM431946152.pdfIn PDF document text
    • http://stomatoloska-ordinacija-rijeka.com/files/fbchampion_GM406889139.pdfIn PDF document text
    • https://www.stomatoloska-ordinacija-rijeka.com/files/how-to-get-free-robux-inspect_GM431946152.pdfIn PDF document text
    • https://www.stomatoloska-ordinacija-rijeka.com/files/free-robux-codes-2021-live_GM431946152.pdfIn PDF document text
    • https://www.stomatoloska-ordinacija-rijeka.com/files/but-link-says-free-robux_GM431946152.pdfIn PDF document text
    • http://stomatoloska-ordinacija-rijeka.com/files/youtube-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.stomatoloska-ordinacija-rijeka.com/files/free-robux-raffle-and-generator_GM431946152.pdfIn PDF document text
    • https://www.stomatoloska-ordinacija-rijeka.com/files/free-robux-no-gift-card_GM431946152.pdfIn PDF document text
    • http://stomatoloska-ordinacija-rijeka.com/files/will-minecraft-dungeons-be-free_GM479516143.pdfIn PDF document text
    • https://www.stomatoloska-ordinacija-rijeka.com/files/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://www.stomatoloska-ordinacija-rijeka.com/files/coin-master-free-spin-link-app_GM406889139.pdfIn PDF document text
    • https://www.stomatoloska-ordinacija-rijeka.com/files/hack-coin-master-using-cheat-engine_GM406889139.pdfIn PDF document text
    • http://stomatoloska-ordinacija-rijeka.com/files/buy-robux-free_GM431946152.pdfIn PDF document text
    • http://stomatoloska-ordinacija-rijeka.com/files/how-to-get-free-roebucks_GM431946152.pdfIn PDF document text
    • https://www.stomatoloska-ordinacija-rijeka.com/files/how-to-make-anything-free-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.stomatoloska-ordinacija-rijeka.com/files/minecraft-pocket-edition-free_GM479516143.pdfIn PDF document text
    • http://stomatoloska-ordinacija-rijeka.com/files/coin-master-hack-apk-download-2021_GM406889139.pdfIn PDF document text
    • http://stomatoloska-ordinacija-rijeka.com/files/minecraft-tools_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
font_00_sfnt_off00003185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3185 21816 bytes
SHA-256: 0f5afab1f741f2fe3fcf9c4289cc5b96c705814a5c5a8f30dc4692df31e07cde
font_01_sfnt_off0000618f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x618F 19436 bytes
SHA-256: 45b9ce1014872b369476cc75d8a7b63b2e3ed395e28419daf66bd30eabd4401a

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