Malicious PDF — malware analysis report

Static analysis result for SHA-256 447351ab82ba1740…

MALICIOUS

PDF

35.2 KB Created: 2021-07-04 15:57:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: efb1f4a20758e50bdbbd3deb4d808b2d SHA-1: 5136068fa95df79e3e317426a3b9538ee95b260d SHA-256: 447351ab82ba1740f64cf9eb15c2bb093654fcb2b020b77fe20fc6979c00e250
142 Risk Score

Malware Insights

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

This PDF document contains numerous links to external websites, many of which are disguised as game hacks or generators for popular games like Coin Master and Roblox. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of such links, suggesting a link farm or SEO manipulation tactic. The primary lure appears to be '100 Free Spins Coin Master', directing users to a suspicious URL that likely hosts malicious content or phishing pages.

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/406889139/100-free-spins-coin-master-game-hack PDF link annotation
    • https://barokahutama.co.id/ckfinder/userfiles/files/roblox-rush-com-free-robux_GM431946152.pdfIn PDF document text
    • https://barokahutama.co.id/ckfinder/userfiles/files/how-to-get-robux-for-free-hack-2021_GM431946152.pdfIn PDF document text
    • https://barokahutama.co.id/ckfinder/userfiles/files/download-coin-master-hack-mod-apk_GM406889139.pdfIn PDF document text
    • https://barokahutama.co.id/ckfinder/userfiles/files/free-robux-2021-game_GM431946152.pdfIn PDF document text
    • https://barokahutama.co.id/ckfinder/userfiles/files/how-to-get-minecraft-java-for-free_GM479516143.pdfIn PDF document text
    • https://barokahutama.co.id/ckfinder/userfiles/files/coin-master-free-2021-spin-link_GM406889139.pdfIn PDF document text
    • https://barokahutama.co.id/ckfinder/userfiles/files/free-robux-no-password_GM431946152.pdfIn PDF document text
    • https://barokahutama.co.id/ckfinder/userfiles/files/free-spins-coin-master-cheat_GM406889139.pdfIn PDF document text
    • https://barokahutama.co.id/ckfinder/userfiles/files/roblox36com-free-robux_GM431946152.pdfIn PDF document text
    • https://barokahutama.co.id/ckfinder/userfiles/files/boku-no-roblox-hack_GM431946152.pdfIn PDF document text
    • https://barokahutama.co.id/ckfinder/userfiles/files/free-coins-coin-master-daily_GM406889139.pdfIn PDF document text
    • https://barokahutama.co.id/ckfinder/userfiles/files/coin-master-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • https://barokahutama.co.id/ckfinder/userfiles/files/how-to-get-free-robux-easy-2021_GM431946152.pdfIn PDF document text
    • https://barokahutama.co.id/ckfinder/userfiles/files/robloxs-got-talent-hack_GM431946152.pdfIn PDF document text
    • https://barokahutama.co.id/ckfinder/userfiles/files/free-minecraft-pe-server_GM479516143.pdfIn PDF document text
    • https://barokahutama.co.id/ckfinder/userfiles/files/how-to-get-free-schrt-in-robux_GM431946152.pdfIn PDF document text
    • https://barokahutama.co.id/ckfinder/userfiles/files/free-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • https://barokahutama.co.id/ckfinder/userfiles/files/roblox-greenwood-town-how-to-get-free-deathbringer_GM431946152.pdfIn PDF document text
    • https://barokahutama.co.id/ckfinder/userfiles/files/how-to-get-free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://barokahutama.co.id/ckfinder/userfiles/files/free-minecraft-accounts-2021_GM479516143.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_off0000335a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x335A 22760 bytes
SHA-256: eccd88331c113e3532b0e4b633951571fa572bb1cea8522e206a37877e3ff446
font_01_sfnt_off00006694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6694 18452 bytes
SHA-256: d0c04ff51ad59f6355ad4f24aeb86ad145506544650f67de66568f082738138f

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