Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fbf807bc84c9bd6…

MALICIOUS

PDF

44.5 KB Created: 2021-06-07 19:31:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 4b70bef9130dbfe06018a127695a6615 SHA-1: 3103e9712885dcc8fcb7de9c6a9898c42cda5981 SHA-256: 1fbf807bc84c9bd6ae1cc3e8931d3077a39a57d94d7ec11b1c88a6f9e2ebc3bf
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains multiple links to external websites that offer 'game hacks' and 'free generators', a common lure for malicious downloads or phishing. The presence of a fake CAPTCHA heuristic further suggests an attempt to trick the user into executing a malicious action. While no scripts were directly extracted, the PDF structure and embedded links indicate a high likelihood of leading to a second-stage payload or exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.tw/app/431946152/counter-strike-roblox-offensive-hacks-game-hack PDF link annotation
    • http://rushxpress.de/images/free-minecraft-realm-codes_GM479516143.pdfIn PDF document text
    • http://rushxpress.de/images/coin-master-free-coins-2021_GM406889139.pdfIn PDF document text
    • http://rushxpress.de/images/robuxy-com-generator_GM431946152.pdfIn PDF document text
    • http://rushxpress.de/images/how-to-get-free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://rushxpress.de/images/wurst-hacks_GM479516143.pdfIn PDF document text
    • http://rushxpress.de/images/how-to-get-free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://rushxpress.de/images/how-do-you-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://rushxpress.de/images/free-robux-no-gift-card_GM431946152.pdfIn PDF document text
    • http://rushxpress.de/images/free-coin-master-links_GM406889139.pdfIn PDF document text
    • http://rushxpress.de/images/coin-master-free-spins-link-ios_GM406889139.pdfIn PDF document text
    • http://rushxpress.de/images/badges-central-london-united-kingdom-hack-roblox_GM431946152.pdfIn PDF document text
    • http://rushxpress.de/images/coin-free-spin_GM406889139.pdfIn PDF document text
    • http://rushxpress.de/images/how-to-get-minecraft-for-free-on-iphone_GM479516143.pdfIn PDF document text
    • http://rushxpress.de/images/how-to-earn-robux-in-roblox-free_GM431946152.pdfIn PDF document text
    • http://rushxpress.de/images/minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://rushxpress.de/images/pubg-uc-via-easypaisa_GM1330123889.pdfIn PDF document text
    • http://rushxpress.de/images/make-your-own-minecraft-server-free_GM479516143.pdfIn PDF document text
    • http://rushxpress.de/images/coin-master-free-daily-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://rushxpress.de/images/coin-master-hack-unlimited-spins-apk-download_GM406889139.pdfIn PDF document text
    • http://rushxpress.de/images/roblox-hack-top-model_GM431946152.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_004_off0000527c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x527C 24352 bytes
SHA-256: 15ad3e29178cad171a11ebd1932e65485f534dda0a77a7f4afa3902a0609bf18
font_01_sfnt_off00008a39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A39 18660 bytes
SHA-256: 9b38aabd7dedcdfd227a483f9b55336bbb2e5927d857f0080cbf67b5c8bd1d83

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