Malicious PDF — malware analysis report

Static analysis result for SHA-256 28f6c4d23dab2bcb…

MALICIOUS

PDF

45.1 KB Created: 2021-06-07 06:51:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 254cef4ce5d6776724c39ba0290ff284 SHA-1: fa0a739e4234b50586086fd081715a449eb7b6d4 SHA-256: 28f6c4d23dab2bcb051f46d7be14a3e41021c948a9bb69a5edda8376c9e351a2
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 0.9865

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 https://netcdn.tw/app/431946152/how-to-hack-into-roblox-and-get-robux-game-hack PDF link annotation
    • https://razredna-nastava.net/files/free-roblox-accounts-with-builders-club_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/coin-master-spin-cheat_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/minecraft-on-computer-free_GM479516143.pdfIn PDF document text
    • http://razredna-nastava.net/files/robux-free-com_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/coin-master-32-mod-hack-apk-download_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/free-robux-websites-that-actually-work_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/download-minecraft-free-hiapphere_GM479516143.pdfIn PDF document text
    • https://razredna-nastava.net/files/roblox-free-vip-server_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/coin-master-free-spin-and-coins-fbid-links_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/free-spins-for-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/coin-master-free-coins-and-spins-daily_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/free-roblox-clothes-2021_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/how-to-get-minecraft-for-free-on-mobile_GM479516143.pdfIn PDF document text
    • https://razredna-nastava.net/files/coin-master-rewards_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/a-lot-of-robux_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/coins-master-hacks_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/free-spins_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/apps-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/how-to-get-hacks-on-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
stream_004_off00005109.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5109 25676 bytes
SHA-256: 8050e7193cd11e109598cf3b864f01b5b4ef147e712ee7785039ecdcd09a1f16
font_01_sfnt_off00008c11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C11 18764 bytes
SHA-256: 2fe81bd1a03d7614afa7c3bb4ba49ebfbd9058e1a1f3aace97d399df2b1d55fd

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