Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c36644c0bf8e706…

MALICIOUS

PDF

34.7 KB Created: 2021-06-30 01:39:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-02
MD5: ac7c5e8ca6878393fa89b7fe6ec557f0 SHA-1: e33954a577ecf0905aa5366b86421edabbd4ea2d SHA-256: 1c36644c0bf8e7064f5d48cfd0c6a3957c35a009e02ccbd22df6e6d6a822831d
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is designed as a lure, presenting itself as a 'free Robux Generator' or 'game hack' to entice users. It contains numerous embedded links, including a primary redirector URL, that lead to websites offering similar scams or potentially hosting further malicious content. The ML classifier strongly indicated maliciousness, and the presence of multiple SEO-optimized PDF links suggests a link farm designed to attract traffic and potentially distribute malware.

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.
  • Invisible PDF links to CAPTCHA-themed web lure high PDF_CAPTCHA_LINK_LURE
    PDF contains invisible clickable link annotations that point to a CAPTCHA/capcha-themed web path. This is a common phishing and ClickFix-style routing pattern: the PDF itself is inert, while the linked page performs the credential prompt or fake verification.
  • 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
  • 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/free-robux-generator-no-survey-or-captcha-game-hack In PDF document text
    • https://loba.com.vn/public/upload/files/free-shirt-templates-on-roblox_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/coin-master-collect-today-free-spin_GM406889139.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/roblox-jailbreak-hack-download-pc_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/coin-master-hack_GM406889139.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/www-we-hack-com-roblox_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/websites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/do-you-want-some-free-robux_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/roblox-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/roblox-skins-girl-free-download_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/how-to-cheat-at-roblox_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/free-girl-hair-roblox_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/coin-master-hack-that-actually-works_GM406889139.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/facebook-coin-master_GM406889139.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/spin-free-coin-master_GM406889139.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/can-you-make-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/robux-cheat-2021_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/roblox-the-guy-who-hacked-the-admin-panel_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/get-free-robux-on-a-ipad_GM431946152.pdfIn PDF document text
    • https://loba.com.vn/public/upload/files/roblox-free-robux-codes_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_off00002f16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F16 22528 bytes
SHA-256: cdf2f265bce38661dc121056788caf196a435f85cf6cd9c770b345dbdeb878f2
font_01_sfnt_off00006174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6174 19456 bytes
SHA-256: 9f1fc3f0f37e9241fd140c9070fd5f33c1d490faa35a9438c556da6cfe6f4f76

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