Malicious PDF — malware analysis report

Static analysis result for SHA-256 b35c4e9680570b35…

MALICIOUS

PDF

34.1 KB Created: 2021-07-06 15:09:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 305487cad08876e1b2e7b21ec4d7d8de SHA-1: 11d2cbac88f1dd55a80c92bbbed337e40df0d6ef SHA-256: b35c4e9680570b35f4a6aa73157934ed96e14fb7ad457ab56a32c49680678a6d
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a common lure of 'free game hacks' to direct users to a link farm. The document contains numerous links to external PDFs, many of which are SEO-optimized and likely serve as a gateway to malicious content or further phishing attempts. The ML classifier strongly indicated maliciousness, and the PDF structure suggests a deliberate attempt to create a link farm for SEO manipulation or to distribute malware indirectly.

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/431946152/flame-gg-free-robux-game-hack PDF link annotation
    • https://daftarmncvision.id/ckfinder/userfiles/files/is-there-any-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://daftarmncvision.id/ckfinder/userfiles/files/how-to-hack-in-roblox-assassin-on-ipad_GM431946152.pdfIn PDF document text
    • https://daftarmncvision.id/ckfinder/userfiles/files/how-do-i-get-free-robux-on-a-phone_GM431946152.pdfIn PDF document text
    • https://daftarmncvision.id/ckfinder/userfiles/files/coin-master-game-free-spin_GM406889139.pdfIn PDF document text
    • https://daftarmncvision.id/ckfinder/userfiles/files/roblox-how-to-get-infinite-robux2021-no-hack-no-cheats_GM431946152.pdfIn PDF document text
    • https://daftarmncvision.id/ckfinder/userfiles/files/free-coin-master-spins-daily_GM406889139.pdfIn PDF document text
    • https://daftarmncvision.id/ckfinder/userfiles/files/how-to-bypass-roblox-with-cheat-engine_GM431946152.pdfIn PDF document text
    • https://daftarmncvision.id/ckfinder/userfiles/files/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • https://daftarmncvision.id/ckfinder/userfiles/files/games-on-roblox-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://daftarmncvision.id/ckfinder/userfiles/files/roblox-how-to-make-a-free-admin-game_GM431946152.pdfIn PDF document text
    • https://daftarmncvision.id/ckfinder/userfiles/files/coin-master-hack-https-coinms-net_GM406889139.pdfIn PDF document text
    • https://daftarmncvision.id/ckfinder/userfiles/files/coin-master-free-coins-2021_GM406889139.pdfIn PDF document text
    • https://daftarmncvision.id/ckfinder/userfiles/files/hack-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://daftarmncvision.id/ckfinder/userfiles/files/no-verification-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://daftarmncvision.id/ckfinder/userfiles/files/coin-master-34-6-hack_GM406889139.pdfIn PDF document text
    • https://daftarmncvision.id/ckfinder/userfiles/files/free-robux-real-no-hack_GM431946152.pdfIn PDF document text
    • https://daftarmncvision.id/ckfinder/userfiles/files/how-to-use-cheat-engine-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://daftarmncvision.id/ckfinder/userfiles/files/coin-master-400-spin-link-hack_GM406889139.pdfIn PDF document text
    • https://daftarmncvision.id/ckfinder/userfiles/files/coin-master-free-coins-and-spins-blogspot_GM406889139.pdfIn PDF document text
    • https://daftarmncvision.id/ckfinder/userfiles/files/roblox-kick-a-player-with-cheat-engine_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
font_00_sfnt_off00002ead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EAD 22352 bytes
SHA-256: 11ccf71b133065abb3471f6edf3d177080c650f22e04730c5a6ad76411a16e54
font_01_sfnt_off00006034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6034 19052 bytes
SHA-256: 0e5acbd67c2151e2d8a0f290c50b75584f3082951c962a1c817502256c0c0098

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