Malicious PDF — malware analysis report

Static analysis result for SHA-256 4142b81749767eb1…

MALICIOUS

PDF

46.4 KB Created: 2021-06-08 21:43:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 9164bf4b927f4d5b72fe12aee61fb4a2 SHA-1: e9135e009146c536be4e6dcb86897c49a61da55e SHA-256: 4142b81749767eb1b3013cf99659495b65ef03f15e138c915d31fe1427a4ba71
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 'free generator / game hack' lures. The primary redirector URL is https://netcdn.tw/app/431946152/free-roblox-toy-codes-not-used-game-hack. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a malicious redirector designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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/free-roblox-toy-codes-not-used-game-hack In PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/game-hunters-coin-master_GM406889139.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/coin-master-daily-gift-free-spins-and-coins-link_GM406889139.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/free-robux-card-codes_GM431946152.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/free-roblox-avatar_GM431946152.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/oprewards-com-earn_GM431946152.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/pokemon-go-free-trainer-codes_GM1094591345.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/what-games-give-you-robux_GM431946152.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/roblox-btools-hack-script_GM431946152.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/websites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/how-to-hack-someone-on-roblox-easy_GM431946152.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/how-to-get-free-minecoins-in-minecraft_GM479516143.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/coin-master-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/script-executor-roblox-free_GM431946152.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/coin-master-generator-hack_GM406889139.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/free-robux-hack_GM431946152.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/coinmaster-blogspot_GM406889139.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/legit-coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/coin-master-free-spins-usa-2021_GM406889139.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/roblox-free-pants_GM431946152.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/coin-master-hack-tool-v1-9-download-free_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_off000051aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x51AA 28144 bytes
SHA-256: 1fd6bdecb66683601f7a2b359bfa6abc3e0408359deb0c36e854ddd4d0220ed9
font_01_sfnt_off000091dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91DC 18592 bytes
SHA-256: 81fe2106c0d5db37bee378c9af18607d256debaa267bc9b857f52da7d8a402be