Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac1b81f7be9957cb…

MALICIOUS

PDF

35.1 KB Created: 2021-06-29 15:58:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 9236bc7bd39026d39cc74acc134ca8b6 SHA-1: 0127d8037a58fbf198a9c06b14510cd3c165f550 SHA-256: ac1b81f7be9957cb3513fd73c5eabe8e4baa1af2635d02ca1699e9c7c4dab296
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.co/app/431946152/roblox-fly-cheat-engine-2021-game-hack PDF link annotation
    • http://perpustakaan-stikesmsb.com/repository/buy-robux-free_GM431946152.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/free-coins-coin-master-no-human-verification_GM406889139.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/rthe-wild-west-roblox-when-is-going-to-be-free_GM431946152.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/spin-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/roblox-full-version-free-download_GM431946152.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/coin-master-hack-tool-v1-9-download-free_GM406889139.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/free-roblox-2021-unlimited-codes-for-kids_GM431946152.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/how-do-i-get-free-robux-in-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/coin-master-free-spins-promo-code_GM406889139.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/roblox-free-robux-place_GM431946152.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/how-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/free-roblox-hack_GM431946152.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/how-do-you-get-free-robux-in-roblox-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/do-the-obby-for-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/coin-master-free-download-app_GM406889139.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/free-items-hack-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/roblox-promocodes-hack-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/free-robux-codes-tha-rwork_GM431946152.pdfIn PDF document text
    • http://perpustakaan-stikesmsb.com/repository/want-free-robux-now_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_off00002f38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F38 22836 bytes
SHA-256: 2861b5ff39c555378b19412144b757912607deb0a78a3eab29446db8f8daeb1f
font_01_sfnt_off0000624e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x624E 19620 bytes
SHA-256: 3f5a8434cc1816aa6ae1044d751be67e70aed874a4d7e16fb603a8fe45fe0171

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