Malicious PDF — malware analysis report

Static analysis result for SHA-256 4248ebefd4989647…

MALICIOUS

PDF

42.4 KB Created: 2021-05-11 00:32:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 9e749b50329c5733836c3cfd61905880 SHA-1: c9e3cd274bb79c1ab5db3500eb7632def59c1e3e SHA-256: 4248ebefd4989647a30c69147831d386af3de5e449004a0ed387ebbedf2e8bf1
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to malicious infrastructure, specifically promoting 'game hacks' and 'generators' for popular games. The primary lure appears to be related to Coin Master, directing users to https://netcdn.xyz/app/406889139/facebook-coin-master-game-hack. While no scripts were extracted, the PDF structure and embedded URLs strongly indicate a phishing or scam attempt designed to lead users to potentially harmful content or further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://netcdn.xyz/app/406889139/facebook-coin-master-game-hack In PDF document text
    • http://hometech.tw/ckfinder/userfiles/files/when-was-minecraft-free_GM479516143.pdfIn PDF document text
    • http://hometech.tw/ckfinder/userfiles/files/robux-generator_GM431946152.pdfIn PDF document text
    • http://hometech.tw/ckfinder/userfiles/files/minecraft-bedrock-hacks_GM479516143.pdfIn PDF document text
    • http://hometech.tw/ckfinder/userfiles/files/coin-master-claim-spins_GM406889139.pdfIn PDF document text
    • http://hometech.tw/ckfinder/userfiles/files/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://hometech.tw/ckfinder/userfiles/files/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • http://hometech.tw/ckfinder/userfiles/files/get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://hometech.tw/ckfinder/userfiles/files/hack-coin-master-mod-apk_GM406889139.pdfIn PDF document text
    • http://hometech.tw/ckfinder/userfiles/files/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://hometech.tw/ckfinder/userfiles/files/how-to-get-free-spins-and-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://hometech.tw/ckfinder/userfiles/files/robloxbux-us-generator_GM431946152.pdfIn PDF document text
    • http://hometech.tw/ckfinder/userfiles/files/free-robux-no-human-verify_GM431946152.pdfIn PDF document text
    • http://hometech.tw/ckfinder/userfiles/files/get-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://hometech.tw/ckfinder/userfiles/files/easy-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://hometech.tw/ckfinder/userfiles/files/coin-master-free-link-today_GM406889139.pdfIn PDF document text
    • http://hometech.tw/ckfinder/userfiles/files/coin-master-free-blogspot_GM406889139.pdfIn PDF document text
    • http://hometech.tw/ckfinder/userfiles/files/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://hometech.tw/ckfinder/userfiles/files/dailyrobux_GM431946152.pdfIn PDF document text
    • http://hometech.tw/ckfinder/userfiles/files/free-robux-app-2021_GM431946152.pdfIn PDF document text
    • http://hometech.tw/ckfinder/userfiles/files/coin-master-daily-spin-link-app_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_003_off00004a57.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A57 25664 bytes
SHA-256: 2369bb31e2e57d65d57380e58a8522d5444e6c9c64c7bcd7ffc18dc7c1e65c95
font_01_sfnt_off0000844e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x844E 18040 bytes
SHA-256: 178fba5589456397b3db1a2238140a14569a80f5ff3c7f1b6d6dfbcfd3cbde63

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