Malicious PDF — malware analysis report

Static analysis result for SHA-256 403b2d5ef601ee30…

MALICIOUS

PDF

34.2 KB Created: 2021-07-05 22:31:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: a9a7c20a5d58960826f05d337740957c SHA-1: 1df657dd770f9c40656ca5527ff424bc6cf5caa3 SHA-256: 403b2d5ef601ee30b550da1bf86dfd691d2ec05d924c3aeb50ca24877e873a5e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs and a prominent external URI pointing to sites offering game cheats and free currency. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of it being used for phishing or distributing malware. While no scripts were explicitly extracted, the presence of embedded URLs and the document's theme suggest an attempt to trick users into downloading a payload or visiting a malicious site.

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/406889139/coin-master-free-daily-spins-and-coins-game-hack In PDF document text
    • https://www.studio-dentistico-fiume.com/files/roblox-clothes-maker-free_GM431946152.pdfIn PDF document text
    • http://studio-dentistico-fiume.com/files/free-roblox-gift-card-codes_GM431946152.pdfIn PDF document text
    • http://studio-dentistico-fiume.com/files/best-free-robux-sites_GM431946152.pdfIn PDF document text
    • http://studio-dentistico-fiume.com/files/moonactive-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://www.studio-dentistico-fiume.com/files/how-to-hack-a-minecraft-server-and-make-yourself-op_GM479516143.pdfIn PDF document text
    • https://www.studio-dentistico-fiume.com/files/how-to-get-free-robux-2021-easy_GM431946152.pdfIn PDF document text
    • https://www.studio-dentistico-fiume.com/files/free-robux-ge_GM431946152.pdfIn PDF document text
    • https://www.studio-dentistico-fiume.com/files/free-robux-ad_GM431946152.pdfIn PDF document text
    • https://www.studio-dentistico-fiume.com/files/is-minecraft-free-on-nintendo-switch_GM479516143.pdfIn PDF document text
    • https://www.studio-dentistico-fiume.com/files/wurst-download_GM479516143.pdfIn PDF document text
    • http://studio-dentistico-fiume.com/files/roblox-promo-code-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.studio-dentistico-fiume.com/files/roblox-robux-hack-generato_GM431946152.pdfIn PDF document text
    • https://www.studio-dentistico-fiume.com/files/coin-master-ios-hack_GM406889139.pdfIn PDF document text
    • http://studio-dentistico-fiume.com/files/get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://www.studio-dentistico-fiume.com/files/free-robux-glitch-working-2021_GM431946152.pdfIn PDF document text
    • https://www.studio-dentistico-fiume.com/files/coin-master-2021-free-spins-link_GM406889139.pdfIn PDF document text
    • https://www.studio-dentistico-fiume.com/files/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://studio-dentistico-fiume.com/files/coin-master-spins-gratis_GM406889139.pdfIn PDF document text
    • http://studio-dentistico-fiume.com/files/hack-coin-master-nyc_GM406889139.pdfIn PDF document text
    • https://www.studio-dentistico-fiume.com/files/free-game-packs-for-coin-master_GM406889139.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_off00002f54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F54 22528 bytes
SHA-256: bd26f26d293ae9540cef7366408ff232266fe2e9a74d4021ccb63fce185e4dc9
font_01_sfnt_off00006183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6183 18772 bytes
SHA-256: f3f8fa3a6eece84f4896eed170bca3035b504aefd00cdbf459e31d86686c87b4

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