Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ed16bb258c6cc62…

MALICIOUS

PDF

35.0 KB Created: 2021-07-09 22:17:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 1a8940e432cd0582e5cbe958dce70398 SHA-1: 0cbafde3b064723832336283f4a868e3d21ac7fc SHA-256: 9ed16bb258c6cc62fddfb6eab92ae2fcea1b4fbedab9e21d9d7da7a154f24b6c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one to a known malicious redirector at http://netcdn.tw/app/406889139/daily-free-spins-coin-master-game-hack. This redirector is presented as a 'free generator / game hack' lure, indicating a social engineering tactic to entice users to click. The presence of numerous other PDF links related to game hacks and exploits suggests a campaign distributing potentially unwanted or malicious content.

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/406889139/daily-free-spins-coin-master-game-hack In PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/is-roblox-free-on-nintendo-switch_GM431946152.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/how-to-make-anything-free-in-roblox_GM431946152.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/minecraft-windows-10-hacked-client_GM479516143.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/coin-master-apk-hack-2021-ios_GM406889139.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/100-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/coin-master-time-hack-ios_GM406889139.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/mundschutz-download-mundschutz-free-roblox_GM431946152.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/free-roblox-clothes-templates_GM431946152.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/roblox-cheat-engine-robux-no-survey_GM431946152.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/easy-robux_GM431946152.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/how-to-get-key-in-new-hack-roblox-sh-team_GM431946152.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/roblox-hack-download-robux-2021_GM431946152.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/coin-master-hack-2021-ios-download_GM406889139.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/how-to-speed-hack-in-roblox-kick-off_GM431946152.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/roblox-hack-site_GM431946152.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/how-to-get-free-robux-no-human-verification-on-phone_GM431946152.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/roblox-cheap-hack-buy_GM431946152.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/tiktok-free-like-app_GM835599320.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
stream_002_off00003196.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3196 23000 bytes
SHA-256: 5f4e4315f48adcfd7c7a21695ce27d80b139330e916617613a0b182ab5e8178e
font_01_sfnt_off00006553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6553 18596 bytes
SHA-256: e1561e5ad11d6fa371b43628261e275aedbbfff84e2cc2a1b863fefe4a2dbfc2

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