Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0257580606fe3a8…

MALICIOUS

PDF

45.3 KB Created: 2021-06-04 03:03:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c90f6123f313695a5a42a73c27bc3934 SHA-1: 5fd2967a65162cb09a2357e3fbe8b28e01b9bc34 SHA-256: d0257580606fe3a80f45f018c3458902e5d796b25cbb05e819cc7a2eff6a03da
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a fake CAPTCHA lure designed to trick users into clicking a link. This link, 'https://netcdn.online/app/431946152/how-do-you-get-free-robux-on-roblox-game-hack', is associated with known malicious redirector infrastructure. The document's content and the presence of a malicious link strongly suggest a phishing or social engineering attack, likely intended to lead to further malware download or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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 https://netcdn.online/app/431946152/how-do-you-get-free-robux-on-roblox-game-hack In PDF document text
    • https://opac.heritagejkt.org/repository/minecraft-pe-hacks_GM479516143.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/minecraft-free-download-mac-full-version-2021_GM479516143.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/how-to-get-roblox-credit-for-free_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/how-many-villages-are-in-coin-master_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/spin-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/free-spins-promo-code-for-coin-master_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/coin-master-unlimited-spin-hack_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/levvvel-coin-master_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/rbx-gg-free-robux_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/wurst-18_GM479516143.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/minecraft-hacker-mask_GM479516143.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/how-to-get-free-robux-instantly_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/minecraft-pe_GM479516143.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/pubg-2021-uc-redeem-code_GM1330123889.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/rbx-hut_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/level-coin_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/mcpe-free-download_GM479516143.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/coin-master-free-spin-and-coin_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
font_00_sfnt_off0000500b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x500B 26584 bytes
SHA-256: e09547da678fd8d241cb60f45cb3a4ab4f6644166fff29add07e7fec7309ddd1
font_01_sfnt_off00008d6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D6C 18688 bytes
SHA-256: 1a1edbb4620230d43f84097700922ea11c75fa5ad69815b80eb1b16329c7dce0

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