Malicious PDF — malware analysis report

Static analysis result for SHA-256 489907f8da0ab27f…

MALICIOUS

PDF

33.5 KB Created: 2021-07-22 21:40:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 1028c4b4c369d61141850f3af9827e8b SHA-1: 26664ad426be94310a4c913cef3dadd58137f366 SHA-256: 489907f8da0ab27f32f104b7076d3a6eb3f7042ce3536ffbc1279946c2aeb153
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains multiple links to redirector infrastructure, specifically advertising 'free Robux' and game hacks. The primary lure URL is http://netcdn.tw/app/431946152/how-do-u-get-free-robux-game-hack, which is flagged as malicious. The document body also contains numerous other URLs hosted on shiny-nn.ru, likely part of a broader campaign to drive traffic to malicious sites. No scripts were extracted, but the presence of malicious redirectors and the lure content strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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/how-do-u-get-free-robux-game-hack In PDF document text
    • https://shiny-nn.ru/images/free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • https://shiny-nn.ru/images/free-robux-games-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • https://shiny-nn.ru/images/roblox-script-hack_GM431946152.pdfIn PDF document text
    • https://shiny-nn.ru/images/minecraft-life-hacks_GM479516143.pdfIn PDF document text
    • https://shiny-nn.ru/images/how-to-get-minecraft-for-free-on-mobile_GM479516143.pdfIn PDF document text
    • https://shiny-nn.ru/images/roblox-free-robux-codes_GM431946152.pdfIn PDF document text
    • https://shiny-nn.ru/images/free-robux-legit_GM431946152.pdfIn PDF document text
    • https://shiny-nn.ru/images/how-to-hack-a-roblox-account-easy_GM431946152.pdfIn PDF document text
    • https://shiny-nn.ru/images/coin-master-daily-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • https://shiny-nn.ru/images/how-to-hack-roblox-for-robux_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_off00002bb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2BB3 23432 bytes
SHA-256: 58a7c354356d43d35398c961612eb4105bf9c2e146b28d5404298fc41ff94923
font_01_sfnt_off00005fdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FDF 18636 bytes
SHA-256: ab6f51fdb1eed883fd21dff3bd0336e3a1b816e6c21a8924207bfe84ed9a007e