Malicious PDF — malware analysis report

Static analysis result for SHA-256 b63f50cd8feecc90…

MALICIOUS

PDF

47.6 KB Created: 2021-06-03 06:53:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 1ef3dea484427167ca74089845e0bfd0 SHA-1: 189616619c728dee78846172200eec8871ab9820 SHA-256: b63f50cd8feecc900b92005a8599495be7b0a03f98013d0b67609442abec40dd
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 0.9769

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.online/app/431946152/john-doe-roblox-hacker-game-hack PDF link annotation
    • http://library.gkigadingserpong.org/repository/roblox-free-robux-website_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/flame-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-hack-software-download_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-robux-by-watching-ads_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/25-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/roblox-hack-me_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/spin-free-coin-master_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/best-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-roblox-clothes-girl_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/www-roblox-com-robux-free_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/pokemon-go-free-legendary-hack_GM1094591345.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-robux-no-verification-needed_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/minecraft-ps4-code-free_GM479516143.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-robux-real-2021_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/robux-free-c_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/how-to-get-free-roblox_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/how-to-get-hacks-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/como-sacar-buen-puntaje-en-juego-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-gold-cards-coin-master_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/minecraft-kill-aura_GM479516143.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_off00005079.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5079 25608 bytes
SHA-256: 6e0394441dbe52b3d825e1e39e8ce4a3499bb174abd23acb5a73fab2e9416a9e
font_01_sfnt_off00008baa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BAA 2948 bytes
SHA-256: 2e2bdc01c196facafdc9a678064e3c030b47411ab496801555aec4f7dbafd1f8
font_02_sfnt_off000095e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x95E0 18680 bytes
SHA-256: fd443decf8178cd51ee717e0f89bd27a56480e9e0f5488a79ceaa3e76e017fae

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