Malicious PDF — malware analysis report

Static analysis result for SHA-256 21f34bf875a48e4c…

MALICIOUS

PDF

34.6 KB Created: 2021-07-08 21:16:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: e6da35a03a29fe2edb09354e3dc84a9a SHA-1: 0da9f97fe558e9f81ecefec5b75a416956dcc6d0 SHA-256: 21f34bf875a48e4c1dac93dbf585b3aed0c8d171191d7b48491c9c94dd8eeae7
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 0.9980

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/free-robux-for-kids-no-verification-game-hack PDF link annotation
    • https://www.itc-nekretnine.hr/files/free-spins-on-coin-master-game_GM406889139.pdfIn PDF document text
    • https://www.itc-nekretnine.hr/files/free-robux-co_GM431946152.pdfIn PDF document text
    • http://itc-nekretnine.hr/files/roblox-how-to-hack-into-accounts_GM431946152.pdfIn PDF document text
    • https://www.itc-nekretnine.hr/files/free-points-robux_GM431946152.pdfIn PDF document text
    • http://itc-nekretnine.hr/files/roblox-robux-generator-online-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://itc-nekretnine.hr/files/play-coin-master-for-free_GM406889139.pdfIn PDF document text
    • https://www.itc-nekretnine.hr/files/google-play-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://itc-nekretnine.hr/files/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://itc-nekretnine.hr/files/how-to-get-minecraft-windows-10-edition-for-free_GM479516143.pdfIn PDF document text
    • http://itc-nekretnine.hr/files/but-link-says-free-robux_GM431946152.pdfIn PDF document text
    • http://itc-nekretnine.hr/files/free-minecraft-client_GM479516143.pdfIn PDF document text
    • http://itc-nekretnine.hr/files/free-robux-giveaway_GM431946152.pdfIn PDF document text
    • https://www.itc-nekretnine.hr/files/roblox-cheat-engine-70-bypass-2021-rog_GM431946152.pdfIn PDF document text
    • https://www.itc-nekretnine.hr/files/rewards-robux_GM431946152.pdfIn PDF document text
    • https://www.itc-nekretnine.hr/files/coin-master-hack-no-verification_GM406889139.pdfIn PDF document text
    • https://www.itc-nekretnine.hr/files/free-robux-no-verification-2021-ios_GM431946152.pdfIn PDF document text
    • https://www.itc-nekretnine.hr/files/is-minecraft-bedrock-edition-free_GM479516143.pdfIn PDF document text
    • https://www.itc-nekretnine.hr/files/rbx-free-roblox_GM431946152.pdfIn PDF document text
    • https://www.itc-nekretnine.hr/files/bad-minecraft-free_GM479516143.pdfIn PDF document text
    • https://www.itc-nekretnine.hr/files/hack-to-get-the-legendary-pet-in-adopt-me-roblox_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_off000031ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31AC 21804 bytes
SHA-256: 21997185a814aecdf59bb516797dfa6f3bdd80b59016515a85ba44d54faa65e4
font_01_sfnt_off00006169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6169 19248 bytes
SHA-256: cfee841a5dae106b2cf9b4cdd4f4599820923438d7b3e36504f4b087b21eb8e1

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