Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef5c2af36e097107…

MALICIOUS

PDF

34.6 KB Created: 2021-07-03 13:32:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 796c329241644f363e2a69dd20d672e2 SHA-1: c108f742e953e08b2b7b1d500a0cdbf5761297a0 SHA-256: ef5c2af36e09710786550cfd68d94b65fc6e8ed2edb2be34444e3c519716fba2
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' or game hacks. The primary redirector URL, http://netcdn.tw/app/431946152/free-robux-generator-without-human-verification-game-hack, is flagged as malicious. This indicates a social engineering lure designed to lead users to potentially harmful websites, likely for phishing or malware distribution. No scripts were extracted, but the embedded URLs and the nature of the lure strongly suggest a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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-without-human-verification-game-hack In PDF document text
    • http://xenonsvjetla.com/files/coin-master-heaven_GM406889139.pdfIn PDF document text
    • https://www.xenonsvjetla.com/files/roblox-free-skin-maker_GM431946152.pdfIn PDF document text
    • https://www.xenonsvjetla.com/files/free-robux-working_GM431946152.pdfIn PDF document text
    • https://www.xenonsvjetla.com/files/free-minecraft-account-generator_GM479516143.pdfIn PDF document text
    • https://www.xenonsvjetla.com/files/coin-master-tool-hack_GM406889139.pdfIn PDF document text
    • https://www.xenonsvjetla.com/files/free-funny-outfits-roblox_GM431946152.pdfIn PDF document text
    • https://www.xenonsvjetla.com/files/how-to-get-free-robux-on-chromebook_GM431946152.pdfIn PDF document text
    • https://www.xenonsvjetla.com/files/free-spins-coin-master-without-completing-offers_GM406889139.pdfIn PDF document text
    • https://www.xenonsvjetla.com/files/how-to-get-free-robux-easy-no-wait_GM431946152.pdfIn PDF document text
    • https://www.xenonsvjetla.com/files/free-tiktok-followers-no-human-verification-or-survey-2021_GM835599320.pdfIn PDF document text
    • http://xenonsvjetla.com/files/haktuts-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://xenonsvjetla.com/files/free-roblox-from-chaos_GM431946152.pdfIn PDF document text
    • http://xenonsvjetla.com/files/robux-app_GM431946152.pdfIn PDF document text
    • http://xenonsvjetla.com/files/roblox-a_GM431946152.pdfIn PDF document text
    • http://xenonsvjetla.com/files/free-robux-sites-that-work_GM431946152.pdfIn PDF document text
    • http://xenonsvjetla.com/files/roblox-hack-launcher_GM431946152.pdfIn PDF document text
    • http://xenonsvjetla.com/files/i-want-robux_GM431946152.pdfIn PDF document text
    • http://xenonsvjetla.com/files/how-to-get-free-robux-and-tickets_GM431946152.pdfIn PDF document text
    • http://xenonsvjetla.com/files/ho9w-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://xenonsvjetla.com/files/robux-hack-generator_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_off00002f37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F37 22160 bytes
SHA-256: 46d9926f01622358d58b2cadfa7f614316726e8733d851e4aa666760e765914c
font_01_sfnt_off00006061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6061 19700 bytes
SHA-256: e60e9168f8cab27eb8b59583525fe8b5ec14cc0a6d13d4687843cfc281cbaf60

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