Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c11f70012d474cc…

MALICIOUS

PDF

46.9 KB Created: 2021-05-12 04:42:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: c0db161d6d7213a427a0ecc1badb9d79 SHA-1: 54a0848f8e13cefdb81442b6627c7367c56abd07 SHA-256: 8c11f70012d474cc990d4a0d09be5196957f81d2963333a8d0100ea541aba92d
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses a fake-CAPTCHA lure. 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 0.8948

Heuristics 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.xyz/app/406889139/free-attacks-coin-master-game-hack PDF link annotation
    • http://www.valenciamaids.com/userfiles/files/free-robux-websites-that-actually-work_GM431946152.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/earn-robux-websites_GM431946152.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/static-moonactive-net-rewards_GM406889139.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/coin-master-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/free-robux-generator-no-survey-no-download-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/rbx-sites_GM431946152.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/download-coin-master-hack-tool-v1-9_GM406889139.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/coinmaster-free-cards_GM406889139.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/moon-active_GM406889139.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/minecraft-free-download-iphone_GM479516143.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/free-robux-obby_GM431946152.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/download-coin-master-apk-hack_GM406889139.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/coin-master-free-spins-that-really_GM406889139.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/roblox-login-hack_GM431946152.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/coin-master-free-spins-link-today-new_GM406889139.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/roblox-free-no-download_GM431946152.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/robux-giver_GM431946152.pdfIn PDF document text
    • http://www.valenciamaids.com/userfiles/files/free-robux-on-phone_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_003_off00004dbc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4DBC 26616 bytes
SHA-256: bcd346d545bc401d023be9fd25109162770159a77b0a9bdc90fbe04b13b84c00
font_01_sfnt_off00008c6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C6E 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off0000961f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x961F 17880 bytes
SHA-256: 20084e12e1caf1d14627ac7af16b157ed4b772c86f666b3cc0713bbb3e371b2a

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