Malicious PDF — malware analysis report

Static analysis result for SHA-256 98cba8494a31a2a8…

MALICIOUS

PDF

34.4 KB Created: 2021-07-04 08:36:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: db8373d1cc744681b55705324b258b72 SHA-1: 6ba2018be58fb2345af1d2732cf0a9449bb8dcfe SHA-256: 98cba8494a31a2a8af556660091f1900aed6045be6710459f6d65633c9d97635
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirector infrastructure, specifically advertising 'free generator / game hack' lures. The document body and extracted URLs strongly suggest a phishing or scam attempt to trick users into visiting malicious sites, likely for credential harvesting or further malware delivery. No scripts were extracted, but the presence of embedded URLs and the lure content are sufficient indicators of malicious intent.

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/how-to-get-free-spins-on-coin-master-game-hack In PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/free-robux-apps-that-work_GM431946152.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/how-o-get-free-robux-trackid-sp006_GM431946152.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/coin-master-free-spin-2912-2021_GM406889139.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/roblox-hacks-2021_GM431946152.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/work-at-a-pizza-place-roblox-cheats-2021_GM431946152.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/best-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/coin-master-daily-free-spins-hack_GM406889139.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/how-to-buy-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/free-robux-safe_GM431946152.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/free-coin-master-stuff_GM406889139.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/https-web-roblox-com-games-2021202187-free-join-now_GM431946152.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/cheat-roblox-dll_GM431946152.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/daily-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/how-to-get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/robux-free-com_GM431946152.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/free-robux-promo-codes-2021_GM431946152.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/free-mods-for-coin-master_GM406889139.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/coin-master-daily-free-spin-and-coin-link-haktuts_GM406889139.pdfIn PDF document text
    • http://htbrasil.net/ckfinder/userfiles/files/free-spin-link-coin-master_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
stream_002_off000030e3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x30E3 22628 bytes
SHA-256: 845fd95fa0c69e615a91ae11c0d5393eff8bd58c66484e9fcee9e11b806feaf3
font_01_sfnt_off00006398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6398 18336 bytes
SHA-256: f6486e4c00d3cdc8b5d1192946ddbf803be47e84f44f52a8e54ea271a052a700

Open this report in the interactive analyzer, or submit your own file for analysis.