Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa7cc8b52fc9bafa…

MALICIOUS

PDF

42.3 KB Created: 2021-05-20 04:08:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: e989cbfc016231acaa37115f27f9f0fd SHA-1: 302289a742be37f00208b0277614ec33025c654a SHA-256: fa7cc8b52fc9bafa7fb4e641e7f57f7e92321766d42070b7c64ca51eeabf8f5f
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/431946152/free-roblox-gift-card-codes-game-hack PDF link annotation
    • http://rushxpress.de/images/how-to-make-your-own-minecraft-pe-server-for-free_GM479516143.pdfIn PDF document text
    • http://rushxpress.de/images/free-robux-generator-2021-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://rushxpress.de/images/coin-master-free-spins-link-ios_GM406889139.pdfIn PDF document text
    • http://rushxpress.de/images/robux-get-com_GM431946152.pdfIn PDF document text
    • http://rushxpress.de/images/free-robux-come_GM431946152.pdfIn PDF document text
    • http://rushxpress.de/images/free-robux-gift-card-codes-2021_GM431946152.pdfIn PDF document text
    • http://rushxpress.de/images/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://rushxpress.de/images/robux-download_GM431946152.pdfIn PDF document text
    • http://rushxpress.de/images/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://rushxpress.de/images/free-robux-place_GM431946152.pdfIn PDF document text
    • http://rushxpress.de/images/free-robux-just-enter-username_GM431946152.pdfIn PDF document text
    • http://rushxpress.de/images/coin-game_GM406889139.pdfIn PDF document text
    • http://rushxpress.de/images/coin-master-free-cards_GM406889139.pdfIn PDF document text
    • http://rushxpress.de/images/free-robux-no-gift-card_GM431946152.pdfIn PDF document text
    • http://rushxpress.de/images/daily-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://rushxpress.de/images/coin-master-daily-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • http://rushxpress.de/images/minecraft-fly-hack_GM479516143.pdfIn PDF document text
    • http://rushxpress.de/images/master-coin-free-link_GM406889139.pdfIn PDF document text
    • http://rushxpress.de/images/old-roblox-accounts-for-free_GM431946152.pdfIn PDF document text
    • http://rushxpress.de/images/coin-master-free-spin-and-coin-link-haktuts-hacking-news_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_off0000477a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x477A 25360 bytes
SHA-256: c7559f63ead24e30ac6f56ed909bff6b019145c1d14de6439955a7d4bc9d9226
font_01_sfnt_off000081ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81EE 18572 bytes
SHA-256: ffbc77db5113ad0b7fd344ce16d81dafdbf0c64cd7df39142b32362cc1b263a9

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