Malicious PDF — malware analysis report

Static analysis result for SHA-256 12f44d199afe889c…

MALICIOUS

PDF

42.6 KB Created: 2021-05-17 21:04:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: fb0913fa0462df0ca0b5ea9796908440 SHA-1: fbf5bad32de068de5de32ea3d40b6a30e7fe8818 SHA-256: 12f44d199afe889c63b86f5a30a3f7ecb47e950ad9693ceaca040567febf88bc
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://netcdn.xyz/app/406889139/coinmaster-rewards-game-hack PDF link annotation
    • http://www.kesambibaru.com/new/public/ckfinder/userfiles/files/free-spins-link-in-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.kesambibaru.com/new/public/ckfinder/userfiles/files/chisel-and-bits-mod-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://www.kesambibaru.com/new/public/ckfinder/userfiles/files/master-coin-free-spin-daily_GM406889139.pdfIn PDF document text
    • http://www.kesambibaru.com/new/public/ckfinder/userfiles/files/free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.kesambibaru.com/new/public/ckfinder/userfiles/files/safe-hack-for-coin-master-android_GM406889139.pdfIn PDF document text
    • http://www.kesambibaru.com/new/public/ckfinder/userfiles/files/free-minecraft-java-edition-codes_GM479516143.pdfIn PDF document text
    • http://www.kesambibaru.com/new/public/ckfinder/userfiles/files/coin-master-free-coins-and-spins-hack_GM406889139.pdfIn PDF document text
    • http://www.kesambibaru.com/new/public/ckfinder/userfiles/files/make-free-robux_GM431946152.pdfIn PDF document text
    • http://www.kesambibaru.com/new/public/ckfinder/userfiles/files/coin-master-hack-xyz-2021_GM406889139.pdfIn PDF document text
    • http://www.kesambibaru.com/new/public/ckfinder/userfiles/files/free-coins-for-coin-master-blogger_GM406889139.pdfIn PDF document text
    • http://www.kesambibaru.com/new/public/ckfinder/userfiles/files/free-spin-link-coin-master-today_GM406889139.pdfIn PDF document text
    • http://www.kesambibaru.com/new/public/ckfinder/userfiles/files/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.kesambibaru.com/new/public/ckfinder/userfiles/files/hacks-minecraft_GM479516143.pdfIn PDF document text
    • http://www.kesambibaru.com/new/public/ckfinder/userfiles/files/hack-to-send-gold-cards-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.kesambibaru.com/new/public/ckfinder/userfiles/files/what-is-a-minecraft-client_GM479516143.pdfIn PDF document text
    • http://www.kesambibaru.com/new/public/ckfinder/userfiles/files/202100-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.kesambibaru.com/new/public/ckfinder/userfiles/files/free-robux-no-downloading-apps_GM431946152.pdfIn PDF document text
    • http://www.kesambibaru.com/new/public/ckfinder/userfiles/files/free-roblox-groups_GM431946152.pdfIn PDF document text
    • http://www.kesambibaru.com/new/public/ckfinder/userfiles/files/coin-master-free-spins-hack-without-human-verification_GM406889139.pdfIn PDF document text
    • http://www.kesambibaru.com/new/public/ckfinder/userfiles/files/coin-master-spin-hack-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_off00004b91.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B91 24580 bytes
SHA-256: 04b23e68f04d6e7bb24cf65f178eada02081284d6d515fac61fecee8fd1ef16e
font_01_sfnt_off00008472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8472 18144 bytes
SHA-256: 3304910cf416930b47305d75e02d2266dd9cc93df9b4dcfa32843af2f30c9813

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