Malicious PDF — malware analysis report

Static analysis result for SHA-256 d91aed659b778da9…

MALICIOUS

PDF

32.6 KB Created: 2021-07-09 22:09:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-24
MD5: b772eb82795736c9f9d5675a1d1b3a28 SHA-1: 1c6c88adca29dc4a1b87685521c1922a6bca3e1a SHA-256: d91aed659b778da9f389274692684b937018265f2fac50912bb30c055f04bd4b
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

Heuristics 4

  • 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/rbx-roblox-game-hack PDF link annotation
    • https://www.knjizara-harfa.rs/files/how-to-hack-in-roblox-murderer-mystery-2_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/free-realistic-minecraft-texture-packs_GM479516143.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/give-me-free-robux_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/free-robux-clothes_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/free-robux-without-no-verification_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/dife-cf-free-robux_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/how-to-get-free-roblox-premium_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/free-robux-youtube_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/roblox-theme-park-tycoon-2-cheat-engine_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/cheat-roblox-cb-r-download_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/robux-hack-me_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/free-robux-nowcom_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/roblox-cat-hacked_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/haktuts-free-spins_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/minecraft-ps4-free_GM479516143.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/coin-master-free-spins-link-blogspot-2021_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/coin-master-daily-free-spins-link_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/free-robux-no-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/hack-coin-master-using-cheat-engine_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/free-robux-codes-2021_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_off00002a5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A5E 22320 bytes
SHA-256: a6a60cfd8ecaffa1d1bcea0fc6abd4ac57fba00b8838b00ec0b34cd53b1d0fc2
font_01_sfnt_off00005c28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C28 18484 bytes
SHA-256: f26455743a047e8df56ca1524d10cc4c18a922f3a9254ca202c5887b6dcb4309

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