Malicious PDF — malware analysis report

Static analysis result for SHA-256 56ddd2e4d516ae1c…

MALICIOUS

PDF

34.3 KB Created: 2021-07-09 09:24:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 508f27aad09df3499df6d1cbb3819dc1 SHA-1: 7196e1d060d1ff5819438d3bb1b600068a58f7b7 SHA-256: 56ddd2e4d516ae1cdac70521ba36a58d7275e0f857e2ae670f88b00c57ecff14
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a malformed stream and links to known malicious redirector infrastructure, specifically advertising a "free Roblox com game hack". The document body also contains the URL and a call to action, indicating a lure to a potentially malicious site. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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.tw/app/431946152/free-roblox-com-game-hack In PDF document text
    • http://mbbs.hr/files/coin-master-spin-blogspot_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/coin-master-levels_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/minecraft-112-hacked-client_GM479516143.pdfIn PDF document text
    • https://mbbs.hr/files/coin-master-free-coins-and-spins-daily_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/hack-portal-heroes-roblox_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/free-robux-generator-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/roblox-military-simulator-how-to-use-hacking-device_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/spinuri-gratis-coin-master_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/block-best-robux_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/free-roblox-outfits-2021_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/free-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/easy-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/is-minecraft-free-on-xbox-one_GM479516143.pdfIn PDF document text
    • http://mbbs.hr/files/minecraft-texture-packs-free-download_GM479516143.pdfIn PDF document text
    • https://mbbs.hr/files/free-robux-content-deleted_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/offers-to-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/coin-master-fun-free-spins_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/roblox-its-free-trailer_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_off00002e31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E31 22820 bytes
SHA-256: 0e7394ea35475b4ebb6fa8d0d821672006f552f5654ef76580d91d48675ed797
font_01_sfnt_off00006149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6149 18908 bytes
SHA-256: d440ae50c89bf21c2d7cea83ae76656b5c1e07e58309934906c6eda36fd94443

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