Malicious PDF — malware analysis report

Static analysis result for SHA-256 823dccf5e8403876…

MALICIOUS

PDF

33.2 KB Created: 2021-07-19 21:27:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 12e1825d00a5fc1a4d9d1b44a36fe49a SHA-1: c8d004825744980ada5b7756125e77ace9a14f99 SHA-256: 823dccf5e8403876a1a7c6c63523136bf443eeb744d4411c551a5fe390ee7304
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to redirector infrastructure, specifically advertising 'free Robux generators' and 'game hacks'. The document body explicitly contains the text 'Free Robux Generator Com Roblox Hack' and a call to action to access a Robux generator. The ML classifier also flagged this PDF as malicious. The primary attack pattern involves luring users to malicious websites via deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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 http://netcdn.tw/app/431946152/free-robux-generator-com-roblox-hack-game-hack In PDF document text
    • http://floreswindows.com/images/robux-free-com_GM431946152.pdfIn PDF document text
    • http://floreswindows.com/images/how-can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://floreswindows.com/images/tiktok-likes-free_GM835599320.pdfIn PDF document text
    • http://floreswindows.com/images/how-to-get-minecraft-bedrock-for-free_GM479516143.pdfIn PDF document text
    • http://floreswindows.com/images/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://floreswindows.com/images/freer-pro-tiktok_GM835599320.pdfIn PDF document text
    • http://floreswindows.com/images/coin-master-free-spins-promo-code_GM406889139.pdfIn PDF document text
    • http://floreswindows.com/images/how-to-get-free-robux-without-verifying-2021_GM431946152.pdfIn PDF document text
    • http://floreswindows.com/images/roblox-fly-hack_GM431946152.pdfIn PDF document text
    • http://floreswindows.com/images/how-do-you-get-free-robux-on-roblox_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
font_00_sfnt_off00002c22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C22 22268 bytes
SHA-256: bf741dca79ddcd6d31b3b93a321c5a045688c278bf27b58c3067b5deb819f661
font_01_sfnt_off00005dab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DAB 19036 bytes
SHA-256: e9298e23474107c7b84722852f71881d4055e6a131595fcbba005770bedde36b

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