Malicious PDF — malware analysis report

Static analysis result for SHA-256 da4e381d46da616d…

MALICIOUS

PDF

43.1 KB Created: 2021-05-14 20:21:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: a95784314e8e2fad2c40edface8bd6f9 SHA-1: 1d52881b99e0a311714f66b368698dece6a72bea SHA-256: da4e381d46da616d9f9dfd1ef7c2a0164d150d2406220c301b6dfda124774347
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 0.9971

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/coin-master-free-spins-link-today-blogspot-game-hack PDF link annotation
    • http://sfsbm.org/images/free-robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • http://sfsbm.org/images/https-iosgodscom-topic-20214coinmasterhack_GM406889139.pdfIn PDF document text
    • http://sfsbm.org/images/how-do-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://sfsbm.org/images/coin-master-daily-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://sfsbm.org/images/free-foxy-food-coin-master_GM406889139.pdfIn PDF document text
    • http://sfsbm.org/images/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://sfsbm.org/images/free-robux-com-roblox_GM431946152.pdfIn PDF document text
    • http://sfsbm.org/images/get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://sfsbm.org/images/coin-master-hack-game-download-ios_GM406889139.pdfIn PDF document text
    • http://sfsbm.org/images/coin-master-hack-version-2021-download_GM406889139.pdfIn PDF document text
    • http://sfsbm.org/images/free-robux-real-2021_GM431946152.pdfIn PDF document text
    • http://sfsbm.org/images/free-robux-real-working_GM431946152.pdfIn PDF document text
    • http://sfsbm.org/images/levvvel-coin-master_GM406889139.pdfIn PDF document text
    • http://sfsbm.org/images/hack-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://sfsbm.org/images/coin-master-gameplay_GM406889139.pdfIn PDF document text
    • http://sfsbm.org/images/coin-master-coins_GM406889139.pdfIn PDF document text
    • http://sfsbm.org/images/how-to-get-minecraft-for-free-on-xbox-360_GM479516143.pdfIn PDF document text
    • http://sfsbm.org/images/coin-master-free-spins-promo-code_GM406889139.pdfIn PDF document text
    • http://sfsbm.org/images/free-spin-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://sfsbm.org/images/coin-master-free-cards_GM406889139.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
stream_003_off000048a2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48A2 26160 bytes
SHA-256: 886d947a8da1577cd017ad663bb54c7400d35ab241ad15d2dda6299c71b0ea73
font_01_sfnt_off000083e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83E9 18988 bytes
SHA-256: 1a94c2a9bc7d67929b2b5125a5437c33a0f1d263f98c1f8ab91c7c8b0822f9c3

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