Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bc7ee18981ccf1c…

MALICIOUS

PDF

35.7 KB Created: 2021-07-04 02:10:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 3d8f27c14873de526ab7a069969b1e16 SHA-1: 8053fe36a7e351575dcbcaa0760ab0ab2344ff66 SHA-256: 5bc7ee18981ccf1c28e6a840ac3d8c0418726e4a8c5810bf7eff4f1af1bb6e93
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is designed to lure users into clicking links by promising game hacks and free in-game currency. It contains a large number of external links, many pointing to other PDFs hosted on kumotor.com.tw, forming a link farm. The primary URL http://netcdn.tw/app/406889139/daily-coin-master-free-spin-link-game-hack is a redirector for game hack generators. No scripts were extracted, but the PDF structure and embedded links strongly indicate a malicious intent to redirect users to potentially harmful content.

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/daily-coin-master-free-spin-link-game-hack PDF link annotation
    • http://kumotor.com.tw/upload/userfiles/files/cheat-in-roblox-rocitizens-money_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/free-minecraft-alt-generator_GM479516143.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/free-roblox-account-site-youtubecom_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/free-robux-stream_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/how-to-get-roblox-credit-for-free_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/best-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/coin-master-hack-tool-apk-download_GM406889139.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/how-to-look-like-a-wannabe-hacker-on-roblox_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/how-to-get-free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/download-minecraft-free-hiapphere_GM479516143.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/free-spin-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/free-promo-codes-for-roblox-2021_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/pro-tv-robux-hack_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/coin-master-free-link-today_GM406889139.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/coin-master-claim-free-spins_GM406889139.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/free-spins-for-coin-masters_GM406889139.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/currently-hacked-places-on-roblox_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/free-roblox-shirts-templates_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/how-to-get-free-robux-generator_GM431946152.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_off00003262.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3262 23536 bytes
SHA-256: 4ab522662017b9bec93033839b581a7f8d6f9da40c7a678dcc3f71e8023dc051
font_01_sfnt_off000067ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67AB 18768 bytes
SHA-256: 6995f58a3344afdf1c39eea442142c3f86a5b05fd2aa483286546d573d63d37d

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