Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdb93d82e7b188ad…

MALICIOUS

PDF

33.2 KB Created: 2021-07-07 06:42:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: a4903e493f2ba8910f27da94e01d471b SHA-1: 587a65a19defac4c294adb1050521af70bf43c79 SHA-256: bdb93d82e7b188ad21722e27938808a63b02c6da80c8ac4c56c1b43009042fcb
160 Risk Score

Malware Insights

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

The PDF contains links to a known malicious redirector infrastructure, specifically advertising 'free generators' and 'game hacks' for popular games like Roblox and Coin Master. The document body and embedded URLs suggest a lure to trick users into visiting malicious sites, likely to download further malware or engage in credential harvesting. No scripts were extracted, but the PDF structure and embedded links strongly indicate a malicious redirection workflow.

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/431946152/roblox-www-com-game-hack In PDF document text
    • https://nature-air.com.tw/upload/files/why-wont-cheat-engine-work-on-roblox_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/coin-master-game-download-free_GM406889139.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/free-roblox-gift-cards-discord_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/how-to-hack-roblox-accounts-using-inspect-element_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/coin-master-free-spins-link-no-verification_GM406889139.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/money-script-roblox-hack_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/roblox-rewards-robux_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/how-to-free-robux_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/hackear-coin-master_GM406889139.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/roblox-limiteds-for-free_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/roblox-piano-hack_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/pokemon-go-free-accounts-2021_GM1094591345.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/free-robux-without-verification_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/coin-master-daily-free-spin-app_GM406889139.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/how-to-get-free-robux-grayphiny_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/how-to-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/free-robux-no-verify-2021_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/coin-master-daily-free-link_GM406889139.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/how-do-you-get-roblox-money_GM431946152.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_off00002c31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C31 21884 bytes
SHA-256: cbac87dbd892add844bbb4d5099e04a5e8dcf78e65058cc7e53e40a2e3e2c9a4
font_01_sfnt_off00005c61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C61 19108 bytes
SHA-256: ceed28034d8c161028cd36873b2602c2ebba079ae57d119b604a35ba28887711

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