Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f9dca0356224de8…

MALICIOUS

PDF

49.2 KB Created: 2021-06-07 01:34:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 7d6e21f8b5b075a248666da322978f4b SHA-1: 9fbc8893626fc0ac79dc9b13562fbb6350a06eea SHA-256: 8f9dca0356224de82d7145eba1f1a699a479303b1df2921a5e555b75a2d9a27a
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 0.9796

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/roblox-pal-hair-free-game-hack PDF link annotation
    • http://medinup.pt/images/free-robux-no-verification-needed_GM431946152.pdfIn PDF document text
    • http://medinup.pt/images/free-roblox-clothes-for-your-avatar_GM431946152.pdfIn PDF document text
    • http://medinup.pt/images/hack-card-collection-coin-master_GM406889139.pdfIn PDF document text
    • http://medinup.pt/images/how-to-hack-people-on-roblox_GM431946152.pdfIn PDF document text
    • http://medinup.pt/images/free-roblox-hair-codes_GM431946152.pdfIn PDF document text
    • http://medinup.pt/images/free-robux-generator-no-verification_GM431946152.pdfIn PDF document text
    • http://medinup.pt/images/is-minecraft-free_GM479516143.pdfIn PDF document text
    • http://medinup.pt/images/actual-free-robux_GM431946152.pdfIn PDF document text
    • http://medinup.pt/images/roblox-hack-ga_GM431946152.pdfIn PDF document text
    • http://medinup.pt/images/orewards-com-free-robux_GM431946152.pdfIn PDF document text
    • http://medinup.pt/images/free-roblox-card_GM431946152.pdfIn PDF document text
    • http://medinup.pt/images/roblox-jailbreak-hack_GM431946152.pdfIn PDF document text
    • http://medinup.pt/images/coin-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://medinup.pt/images/buy-robux-free_GM431946152.pdfIn PDF document text
    • http://medinup.pt/images/free-minecraft-wallpaper_GM479516143.pdfIn PDF document text
    • http://medinup.pt/images/spin-coin-master-free_GM406889139.pdfIn PDF document text
    • http://medinup.pt/images/coin-master-sound-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://medinup.pt/images/how-to-get-hacks-on-roblox_GM431946152.pdfIn PDF document text
    • http://medinup.pt/images/free-tiktok-video_GM835599320.pdfIn PDF document text
    • http://medinup.pt/images/free-robux-2021_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000050ae.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50AE 30284 bytes
SHA-256: 42f1b8a17f65b54051b9e2ec8050126e0b225acb68b378ca02a28f892d8fb750
font_01_sfnt_off000093b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x93B0 2844 bytes
SHA-256: baad2f3f6808f4af03fa9398e38c580c8d846f7f773a947d8cc1f39b2753d31a
font_02_sfnt_off00009d72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9D72 18452 bytes
SHA-256: 395b26d34c3b44d046bdefbd6bfcb5172d198460dac8daa2dbab75d0bec518eb