Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3c92c071994531a…

MALICIOUS

PDF

49.1 KB Created: 2021-06-11 04:30:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 20a7f83adbc63d3f5b48a9da6a483474 SHA-1: ac46b3103eeb41eab21608dd38a13d98fbfc1065 SHA-256: c3c92c071994531af85ab9282878bb5bef05c43239e0d943ffcc3dbc5f8ab823
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'game hacks' and 'free generators'. The primary lure URL is https://netcdn.tw/app/431946152/how-to-get-robux-for-free-hacking-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a social engineering attack aimed at tricking users into visiting potentially harmful sites. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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/how-to-get-robux-for-free-hacking-game-hack In PDF document text
    • http://kukuck.de/images/minecraft-free-app_GM479516143.pdfIn PDF document text
    • http://kukuck.de/images/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://kukuck.de/images/coin-master-free-coins-2021_GM406889139.pdfIn PDF document text
    • http://kukuck.de/images/free-coin-master-coins_GM406889139.pdfIn PDF document text
    • http://kukuck.de/images/free-roblox-outfits-2021_GM431946152.pdfIn PDF document text
    • http://kukuck.de/images/kuso-icu-roblox-hack_GM431946152.pdfIn PDF document text
    • http://kukuck.de/images/coin-master-free-gifts_GM406889139.pdfIn PDF document text
    • http://kukuck.de/images/coin-master-cards-hack-2021_GM406889139.pdfIn PDF document text
    • http://kukuck.de/images/free-roblox-clothes-templates_GM431946152.pdfIn PDF document text
    • http://kukuck.de/images/auxs-roblox-hack-pack_GM431946152.pdfIn PDF document text
    • http://kukuck.de/images/coin-master-60-spins_GM406889139.pdfIn PDF document text
    • http://kukuck.de/images/coin-master-free-spins-daily-fb-champion_GM406889139.pdfIn PDF document text
    • http://kukuck.de/images/roblox-zombie-attack-hack_GM431946152.pdfIn PDF document text
    • http://kukuck.de/images/minecraft-windows-10-key-free_GM479516143.pdfIn PDF document text
    • http://kukuck.de/images/free-robux-youtube_GM431946152.pdfIn PDF document text
    • http://kukuck.de/images/how-to-get-robux-easily-for-free_GM431946152.pdfIn PDF document text
    • http://kukuck.de/images/free-robux-free-and-easy_GM431946152.pdfIn PDF document text
    • http://kukuck.de/images/roblox-tower-battles-money-hack_GM431946152.pdfIn PDF document text
    • http://kukuck.de/images/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://kukuck.de/images/legitimate-coin-master-free-spins-apk_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004d18.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D18 27384 bytes
SHA-256: 12f0ddbd3776c6b9c4b853c07673c5ef930d57738c8c349a98f77ea559da39e5
font_01_sfnt_off00008dcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DCB 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off00009add.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9ADD 19088 bytes
SHA-256: a6886e7a2d253c5e9408b18cf612ac8ab59b2291f50a7278766e5b71df21cef5

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