Malicious PDF — malware analysis report

Static analysis result for SHA-256 de78ca7b47e2179d…

MALICIOUS

PDF

40.8 KB Created: 2021-05-20 01:01:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: c517b0d3239e50b73654532d5efac444 SHA-1: 3bfc53fc631ba11414d48299b2332d35af4b1ec8 SHA-256: de78ca7b47e2179df55120cd6a40f62dcdfba62e71689ea2a9aadc31c2843a49
160 Risk Score

Malware Insights

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

The PDF document contains multiple links that redirect to malicious infrastructure, specifically advertising game hacks and generators. The ML classifier also flagged this PDF as malicious. The primary IOC is the redirector URL, which is likely used to host or deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/1330123889/pubg-uc-shop-game-hack In PDF document text
    • http://w-i-r.de/images/free-apk-mods-coin-master_GM406889139.pdfIn PDF document text
    • http://w-i-r.de/images/robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://w-i-r.de/images/how-to-get-free-robux-without-downloading-apps-2021_GM431946152.pdfIn PDF document text
    • http://w-i-r.de/images/roblox-land-free-robux_GM431946152.pdfIn PDF document text
    • http://w-i-r.de/images/dailyrobux_GM431946152.pdfIn PDF document text
    • http://w-i-r.de/images/free-spins-coin-master-2021-hack_GM406889139.pdfIn PDF document text
    • http://w-i-r.de/images/minecraft-hack-2021_GM479516143.pdfIn PDF document text
    • http://w-i-r.de/images/free-spins-coin-master-ios-links_GM406889139.pdfIn PDF document text
    • http://w-i-r.de/images/roblox-free-play-no-download_GM431946152.pdfIn PDF document text
    • http://w-i-r.de/images/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://w-i-r.de/images/free-spins_GM406889139.pdfIn PDF document text
    • http://w-i-r.de/images/coin-master-cheats-2021_GM406889139.pdfIn PDF document text
    • http://w-i-r.de/images/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • http://w-i-r.de/images/how-to-hack-into-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://w-i-r.de/images/daily-free-spin-link-in-coin-master_GM406889139.pdfIn PDF document text
    • http://w-i-r.de/images/how-to-get-free-spins-in-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://w-i-r.de/images/minecraft-windows-10-code-free_GM479516143.pdfIn PDF document text
    • http://w-i-r.de/images/how-to-hack-someone-on-roblox_GM431946152.pdfIn PDF document text
    • http://w-i-r.de/images/microsoft-rewards-roblox_GM431946152.pdfIn PDF document text
    • http://w-i-r.de/images/how-can-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.midasbuy.comIn 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_003_off00004490.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4490 24392 bytes
SHA-256: bb08b8ce98434fdadc002b2febf15e50b1a75d5b848e543f1106b693623a6c1f
font_01_sfnt_off00007cca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7CCA 18380 bytes
SHA-256: 45835a05a64024db0897bb8faf06d0547a894acb04e04f4d3cceb7824b81eb85

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