Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8474e99d1fe6958…

MALICIOUS

PDF

35.3 KB Created: 2021-07-09 06:45:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: fca1c9f3df2f3ed02a3793e67bb1472c SHA-1: dd0ace721cfdfd39b4ad1122176158d5a1f3180c SHA-256: d8474e99d1fe69583d0b3dc41f9d551d008968309adc8185cca6fff2c1145219
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous external links, identified as a link farm, that lure users with promises of game hacks and free currency. The primary URL, http://netcdn.tw/app/406889139/best-free-coin-master-spins-game-hack, and others hosted on windhorsetrek.com, likely serve to redirect users to malicious sites or download further payloads. The ML classifier strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/best-free-coin-master-spins-game-hack PDF link annotation
    • http://windhorsetrek.com/userfiles/files/coin-master-mod-apk-latest-hack-with-unlimited-free-spins_GM406889139.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/real-robux-generator_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/how-to-get-free-robux-without-downloading-any-apps_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/link-for-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/are-you-allowed-to-hack-roblox_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/minecraft-apk-download-free-11-055_GM479516143.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/free-online-generator-for-coin-master_GM406889139.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/how-do-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/free-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/coin-master-free-coins_GM406889139.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/robux-hack-ohne-handy_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/roblox-pink-free-robux_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/how-to-hack-into-nay-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/free-fans-on-tiktok_GM835599320.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/martian-lettuce-coin-master-free_GM406889139.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/www-rbx-com_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/how-to-get-free-robux-for-free_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/coin-master-unlimited-spins_GM406889139.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/cheat-for-dinosour-simulator-on-roblox_GM431946152.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_off00003272.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3272 23280 bytes
SHA-256: 48913fbaaaee308a764ad5448a231d75835fd5e1fec6d279f959949f36ca3aec
font_01_sfnt_off00006701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6701 18388 bytes
SHA-256: 281461e4fd7c5443b837ceedda0924bd791c359b257ced4fc43d271c93f5a952

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