Malicious PDF — malware analysis report

Static analysis result for SHA-256 d225643f85f465d8…

MALICIOUS

PDF

47.6 KB Created: 2021-06-04 01:34:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: f9673764a202f74048f3d3b974b1ecc3 SHA-1: e9fae82716da72ab5a98c38e5429ed774bb26531 SHA-256: d225643f85f465d842ea403843233104514294ba8f35bb1510705708a25b5539
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links that redirect to malicious infrastructure, specifically promoting 'free generator / game hack' lures. The embedded URL 'https://netcdn.online/app/431946152/robux-link-game-hack' is identified as a known malicious redirector. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a phishing or scam attempt designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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.online/app/431946152/robux-link-game-hack In PDF document text
    • http://lib.stimykpn.ac.id/repository/roblox-robux-generator_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/reddit-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/how-to-get-free-robux-games_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/free-robux-with-no-human-verification_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/202100-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-make-robux_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/free-robux-hack_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/pig-master-coin-master-free-spin_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-free-spins-link-whatsapp-group_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coinmaster-free-spins-link_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-robux-app-2021_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/free-robux-live_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/how-to-get-free-robux-in-2021_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/robux-matchcomfree-robux_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-robux-easy-and-fast_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/roblox-premium-free_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-robux-with-no-survey_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/coin-master-gameplay_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/juego-hackeado-de-coin-master_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004efa.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4EFA 25776 bytes
SHA-256: d39db0e96c17e661c925dca8cf01eb479d5febb84ec2f0d6264fb577c71b297a
font_01_sfnt_off00008ac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AC8 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off000097da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97DA 18140 bytes
SHA-256: 55cc32ccd4720f2561bfd726f9949d331fd7a3f535a85ffeb1ea678636ae0346

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