Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d4b4d9ccd514a97…

MALICIOUS

PDF

44.5 KB Created: 2021-05-15 10:51:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 7548ad5ec8f0502a3f244dca62027814 SHA-1: c3b614a1e05f234d4ae3340f5d40618b7a05d8e0 SHA-256: 7d4b4d9ccd514a97ef6817e437b8edd95e995b293431dbf2a92b2ffecf68d3e8
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 0.9632

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/hack-coin-master-no-verification-game-hack PDF link annotation
    • https://farkas.de/images/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://farkas.de/images/coin-master-hack-2021-iphone_GM406889139.pdfIn PDF document text
    • https://farkas.de/images/7-year-old-roblox_GM431946152.pdfIn PDF document text
    • https://farkas.de/images/roblox-avatar-girl_GM431946152.pdfIn PDF document text
    • https://farkas.de/images/how-to-get-free-skins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://farkas.de/images/coin-master-free-link-daily_GM406889139.pdfIn PDF document text
    • https://farkas.de/images/how-to-get-free-roebucks-without-verification_GM431946152.pdfIn PDF document text
    • https://farkas.de/images/how-to-get-free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://farkas.de/images/coin-master-mod-version-free-download-v344_GM406889139.pdfIn PDF document text
    • https://farkas.de/images/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://farkas.de/images/roblox-hack-client_GM431946152.pdfIn PDF document text
    • https://farkas.de/images/free-robux-hack-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://farkas.de/images/coin-master-hack-tool-v1-9-apk_GM406889139.pdfIn PDF document text
    • https://farkas.de/images/free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • https://farkas.de/images/minecraft-mobile-free_GM479516143.pdfIn PDF document text
    • https://farkas.de/images/free-coin-spin_GM406889139.pdfIn PDF document text
    • https://farkas.de/images/minecraft-building-hacks_GM479516143.pdfIn PDF document text
    • https://farkas.de/images/coin-master-event-hack_GM406889139.pdfIn PDF document text
    • https://farkas.de/images/coin-master-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • https://farkas.de/images/village-3-coin-master_GM406889139.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
font_00_sfnt_off00004a8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4A8F 24292 bytes
SHA-256: 6d2172de776277c46f13d3f398634642f27c4b95a00edea2924865af30973629
font_01_sfnt_off00008243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8243 2920 bytes
SHA-256: 601c50867a41b9362538ff18e5f9479a0f9badf698aaf1eb7e88469c11719db7
font_02_sfnt_off00008c5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C5C 17848 bytes
SHA-256: 9aea3c3bd6d72a301cebd4b8c3a59d28c82f5f14f1d448acc55e037e8952ee0a

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