Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba11ff54a2890fd8…

MALICIOUS

PDF

47.9 KB Created: 2021-06-03 14:03:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: b40bd69dad30244b0c46f1fab92967a5 SHA-1: 37355ace14ef1c38281909bae69cf9271494e28c SHA-256: ba11ff54a2890fd81dfea59cc4f7d61df71f17d06c400559940242c1b30db1d0
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/406889139/facebook-coin-master-free-spins-link-game-hack PDF link annotation
    • http://library.gkigadingserpong.org/repository/get-free-robux-today_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-robux-no-anti-bot-verification_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/get-robux-now_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/how-to-get-free-roblox-gift-cards_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-hack-safe_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-robux-no-human-verification-or-survey-or-download_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-spin-coin-master-today_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/minecraft-pocket-apk_GM479516143.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/hack-coin-master-net_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-robux-no-offers_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/lazy-blocks-com-free-robux_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/woman-roblox_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-robux-no-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/todays-free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/hack-coin-master-download-ios_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/rbl-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/coinmaster-gps-user-review-coinmaster-coin-master-hack-pagedemo-index_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-gfx-roblox_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_off00005338.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5338 25288 bytes
SHA-256: 8cbfe13009b34718f8c908f2f90ecad26d62e1a9294e184f72ed46af26a6884e
font_01_sfnt_off00008c18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C18 3524 bytes
SHA-256: fca0247c5773b78fc3c853c3ca665df79492e50b8a2eab8c1800136977cac75b
font_02_sfnt_off0000988e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x988E 18212 bytes
SHA-256: 04111eee9c2a2756cf2b040d38ecbe9c25ace8b6aa6ca53a6765e3abdcc42c50

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