Malicious PDF — malware analysis report

Static analysis result for SHA-256 cab48885f5370cd6…

MALICIOUS

PDF

35.2 KB Created: 2021-06-19 09:18:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 12b17c45c607beb83f8adf2216c81089 SHA-1: 9507e308245031b98bd7bbcb4f38d826d4a44cf4 SHA-256: cab48885f5370cd6a7e3fad69b2d82fb818456a0e55fed6eaf0e050754c0cae8
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to websites and documents promising game hacks and free currency, indicative of a phishing or scam lure. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of such links were embedded. While no scripts were explicitly extracted, the nature of the links suggests a potential for further malicious activity, such as downloading additional payloads or redirecting to exploit kits.

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.co/app/431946152/easy-way-to-get-free-robux-game-hack PDF link annotation
    • https://qmsystemsbrochure.com/admin/ckfinder/userfiles/files/stella-beta-roblox-hack-download_GM431946152.pdfIn PDF document text
    • https://qmsystemsbrochure.com/admin/ckfinder/userfiles/files/codes-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://qmsystemsbrochure.com/admin/ckfinder/userfiles/files/free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://qmsystemsbrochure.com/admin/ckfinder/userfiles/files/coin-master-hack-tool-2021_GM406889139.pdfIn PDF document text
    • https://qmsystemsbrochure.com/admin/ckfinder/userfiles/files/free-tiktok-accounts-with-followers_GM835599320.pdfIn PDF document text
    • https://qmsystemsbrochure.com/admin/ckfinder/userfiles/files/free-robux-com-real_GM431946152.pdfIn PDF document text
    • https://qmsystemsbrochure.com/admin/ckfinder/userfiles/files/www-robux-com_GM431946152.pdfIn PDF document text
    • https://qmsystemsbrochure.com/admin/ckfinder/userfiles/files/free-robux-only-username-no-human-verification_GM431946152.pdfIn PDF document text
    • https://qmsystemsbrochure.com/admin/ckfinder/userfiles/files/play-coin-master-online-free_GM406889139.pdfIn PDF document text
    • https://qmsystemsbrochure.com/admin/ckfinder/userfiles/files/free-robux-survey_GM431946152.pdfIn PDF document text
    • https://qmsystemsbrochure.com/admin/ckfinder/userfiles/files/coin-master-card-hack-2021_GM406889139.pdfIn PDF document text
    • https://qmsystemsbrochure.com/admin/ckfinder/userfiles/files/coin-master-daily-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • https://qmsystemsbrochure.com/admin/ckfinder/userfiles/files/como-hackear-coin-master-gratis_GM406889139.pdfIn PDF document text
    • https://qmsystemsbrochure.com/admin/ckfinder/userfiles/files/minecraft-games-to-play-for-free_GM479516143.pdfIn PDF document text
    • https://qmsystemsbrochure.com/admin/ckfinder/userfiles/files/how-to-get-free-robux-on-phone_GM431946152.pdfIn PDF document text
    • https://qmsystemsbrochure.com/admin/ckfinder/userfiles/files/free-vip-server-roblox_GM431946152.pdfIn PDF document text
    • https://qmsystemsbrochure.com/admin/ckfinder/userfiles/files/how-to-get-free-roblox-hair_GM431946152.pdfIn PDF document text
    • https://qmsystemsbrochure.com/admin/ckfinder/userfiles/files/free-gold-cards-coin-master_GM406889139.pdfIn PDF document text
    • https://qmsystemsbrochure.com/admin/ckfinder/userfiles/files/coin-master-hack-app-android_GM406889139.pdfIn PDF document text
    • https://qmsystemsbrochure.com/admin/ckfinder/userfiles/files/coin-master-gold-cards-hack-english_GM406889139.pdfIn PDF document text
    • https://www.roblox.com/.IIn 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_off00003272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3272 22232 bytes
SHA-256: 7fdb2a01ff219c19213bb452e2a56e4818b46a283dc72f91eebdaccce95f8d8d
font_01_sfnt_off000063de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63DE 19196 bytes
SHA-256: 64e8f018724e62164b0ada1d77f482f882d8547e2dcd2accc6d14ba4748306e9

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