Malicious PDF — malware analysis report

Static analysis result for SHA-256 c21e801f574fb619…

MALICIOUS

PDF

35.7 KB Created: 2021-07-03 17:06:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 93f6f04df5e86c0cf90f3d44bd3d4c2f SHA-1: ada45828363378e8aecc91507dec2219523f09a0 SHA-256: c21e801f574fb619d180df622ece4c7d9cbd675f6d925515df58320be642593d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a known malicious redirector infrastructure, specifically designed to lure users with game-related cheats and hacks. The document body and embedded URLs strongly suggest a phishing or scam attempt, likely to deliver a secondary payload or lead users to a credential harvesting site. No scripts were extracted, but the presence of malicious links and the ML classifier's high confidence indicate a high likelihood 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/coin-master-free-spins-link-blogspot-april-2021-game-hack In PDF document text
    • http://battistibrothers.com/system/userfiles/files/coin-master-free-spins-link-haktuts_GM406889139.pdfIn PDF document text
    • http://battistibrothers.com/system/userfiles/files/install-coin-master_GM406889139.pdfIn PDF document text
    • http://battistibrothers.com/system/userfiles/files/free-roblox-hair-boy_GM431946152.pdfIn PDF document text
    • http://battistibrothers.com/system/userfiles/files/coin-master-35-16-hack-apk_GM406889139.pdfIn PDF document text
    • http://battistibrothers.com/system/userfiles/files/coin-master-free-coins-and-spins-daily_GM406889139.pdfIn PDF document text
    • http://battistibrothers.com/system/userfiles/files/roblox-hack-tool-download-robux_GM431946152.pdfIn PDF document text
    • http://battistibrothers.com/system/userfiles/files/village-3-coin-master_GM406889139.pdfIn PDF document text
    • http://battistibrothers.com/system/userfiles/files/coin-master-free-spins-heaven_GM406889139.pdfIn PDF document text
    • http://battistibrothers.com/system/userfiles/files/download-roblox-mod-apk-hack_GM431946152.pdfIn PDF document text
    • http://battistibrothers.com/system/userfiles/files/hack-master-coin_GM406889139.pdfIn PDF document text
    • http://battistibrothers.com/system/userfiles/files/free-coin-master-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://battistibrothers.com/system/userfiles/files/free-print-roblox-coloring-pages_GM431946152.pdfIn PDF document text
    • http://battistibrothers.com/system/userfiles/files/roblox-free-clothes-girl_GM431946152.pdfIn PDF document text
    • http://battistibrothers.com/system/userfiles/files/roblox-free-script-injector-2021-windows-10_GM431946152.pdfIn PDF document text
    • http://battistibrothers.com/system/userfiles/files/roblox-fun-robux_GM431946152.pdfIn PDF document text
    • http://battistibrothers.com/system/userfiles/files/how-to-make-a-minecraft-client_GM479516143.pdfIn PDF document text
    • http://battistibrothers.com/system/userfiles/files/how-to-get-free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • http://battistibrothers.com/system/userfiles/files/coin-master-free-link-2021_GM406889139.pdfIn PDF document text
    • http://battistibrothers.com/system/userfiles/files/get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://battistibrothers.com/system/userfiles/files/does-coin-master-hack-work_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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off000033aa.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x33AA 22712 bytes
SHA-256: 9daae73073363dfdf17097314d6188db3526c313acc8a1a15fec4631ef481919
font_01_sfnt_off00006693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6693 19036 bytes
SHA-256: ef972ac8b6f0d301ec64deecd99ee3108bd9315cf8785a49d8f43646f678be13

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