Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e7afdde083c0dcd…

MALICIOUS

PDF

34.1 KB Created: 2021-07-04 07:58:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: f1fc127d179fbbdbfa388871628b2636 SHA-1: 21873765b1fa619286c6c06fb86a9a5698fad3b5 SHA-256: 4e7afdde083c0dcd33171f1382990ce0f37bb674c277c7f511972b1d265bfa91
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 generators" and "hacks" for popular games. The primary lure URL is http://netcdn.tw/app/406889139/spin-free-coin-master-game-hack. While no scripts were extracted, the document's structure and embedded URLs strongly indicate a phishing or scam attempt designed to redirect users to potentially harmful sites. The ML classifier also flagged this PDF with high confidence.

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/spin-free-coin-master-game-hack In PDF document text
    • http://charivne.info/ckfinder/userfiles/files/generate-robux-for-free_GM431946152.pdfIn PDF document text
    • http://charivne.info/ckfinder/userfiles/files/roblox-hack-cheat-download_GM431946152.pdfIn PDF document text
    • http://charivne.info/ckfinder/userfiles/files/coin-master-attack-hack-apk_GM406889139.pdfIn PDF document text
    • http://charivne.info/ckfinder/userfiles/files/minecraft-windows-10-hacked-client_GM479516143.pdfIn PDF document text
    • http://charivne.info/ckfinder/userfiles/files/coin-master-daily-free-spins-link_GM406889139.pdfIn PDF document text
    • http://charivne.info/ckfinder/userfiles/files/coin-master-free-2021-spin-link_GM406889139.pdfIn PDF document text
    • http://charivne.info/ckfinder/userfiles/files/minecraft-bedrock-edition-pc-free_GM479516143.pdfIn PDF document text
    • http://charivne.info/ckfinder/userfiles/files/coin-master-daily-free-spins-link-app_GM406889139.pdfIn PDF document text
    • http://charivne.info/ckfinder/userfiles/files/free-spin-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://charivne.info/ckfinder/userfiles/files/hackear-coin-master-espaol_GM406889139.pdfIn PDF document text
    • http://charivne.info/ckfinder/userfiles/files/coin-master-daily-free-spins-today_GM406889139.pdfIn PDF document text
    • http://charivne.info/ckfinder/userfiles/files/robux-withdraw_GM431946152.pdfIn PDF document text
    • http://charivne.info/ckfinder/userfiles/files/free-robux-generator-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://charivne.info/ckfinder/userfiles/files/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://charivne.info/ckfinder/userfiles/files/minecraft-free-download-ipad_GM479516143.pdfIn PDF document text
    • http://charivne.info/ckfinder/userfiles/files/oprewards-points-generator_GM431946152.pdfIn PDF document text
    • http://charivne.info/ckfinder/userfiles/files/how-to-get-free-coins-on-roblox-murder-mystery-2_GM431946152.pdfIn PDF document text
    • http://charivne.info/ckfinder/userfiles/files/free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • http://charivne.info/ckfinder/userfiles/files/roblox-polyguns-hack_GM431946152.pdfIn PDF document text
    • http://charivne.info/ckfinder/userfiles/files/wurst-112-2_GM479516143.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
font_00_sfnt_off00003039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3039 22716 bytes
SHA-256: e4c5ccf92556a63b8299a6687ffede85432d480abe0235afca926b6c4d180cff
font_01_sfnt_off000062eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62EB 18176 bytes
SHA-256: 8b68a35672d5b21ea29aeea640c198d2f03cb2d1fa451451c8ac02328cee2fb7

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