Malicious PDF — malware analysis report

Static analysis result for SHA-256 236f872f91bf1d23…

MALICIOUS

PDF

34.8 KB Created: 2021-06-25 16:25:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: afe3bd50c1cbe05a75688d69a0268462 SHA-1: 0cf5e9811aae27c16f7cba95248ed0f05c0770d2 SHA-256: 236f872f91bf1d2304e80ade8a6b019dc12c44019abdac5d3c77d3774f7e5bcc
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs that lead to redirectors, which are associated with malicious activity. The document body explicitly mentions 'free Robux' and 'game hack', indicating a lure for users interested in such topics. The presence of these links and the lure suggest the document is designed to redirect users to potentially harmful websites, likely for further exploitation or malware delivery.

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.co/app/431946152/earn-rixty-codes-for-free-robux-game-hack In PDF document text
    • http://itc-nekretnine.hr/files/free-admin-on-roblox-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://www.itc-nekretnine.hr/files/how-to-get-roblox-money_GM431946152.pdfIn PDF document text
    • https://www.itc-nekretnine.hr/files/easy-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://itc-nekretnine.hr/files/how-to-get-minecraft-pe-for-free_GM479516143.pdfIn PDF document text
    • https://www.itc-nekretnine.hr/files/dailyrobux_GM431946152.pdfIn PDF document text
    • https://www.itc-nekretnine.hr/files/free-online-minecraft-server_GM479516143.pdfIn PDF document text
    • https://www.itc-nekretnine.hr/files/minecraft-free-download-apk-softonic_GM479516143.pdfIn PDF document text
    • https://www.itc-nekretnine.hr/files/rblx-city-free-robux_GM431946152.pdfIn PDF document text
    • http://itc-nekretnine.hr/files/coin-master-unlimited-spins-hack_GM406889139.pdfIn PDF document text
    • https://www.itc-nekretnine.hr/files/earn-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://itc-nekretnine.hr/files/free-robux-generator-without-human-verification_GM431946152.pdfIn PDF document text
    • http://itc-nekretnine.hr/files/free-robux-giveaway_GM431946152.pdfIn PDF document text
    • https://www.itc-nekretnine.hr/files/hack-to-protect-village-on-coin-master_GM406889139.pdfIn PDF document text
    • http://itc-nekretnine.hr/files/how-to-change-roblox-name-for-free_GM431946152.pdfIn PDF document text
    • http://itc-nekretnine.hr/files/coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://itc-nekretnine.hr/files/how-to-win-free-robux_GM431946152.pdfIn PDF document text
    • https://www.itc-nekretnine.hr/files/coin-master-daily-spin-link_GM406889139.pdfIn PDF document text
    • http://itc-nekretnine.hr/files/how-to-hack-roblox-to-get-lots-of-robux_GM431946152.pdfIn PDF document text
    • https://www.itc-nekretnine.hr/files/free-robux-giver-2021_GM431946152.pdfIn PDF document text
    • https://www.itc-nekretnine.hr/files/free-robux-codes_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_off00003048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3048 22380 bytes
SHA-256: 1ff3ba2d02372104f75bf4f0f8eb687f2c6d8f69c791178ca89d6e844068cd98
font_01_sfnt_off0000623d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x623D 19296 bytes
SHA-256: bc01c2e3b18a7fb76f169dfc095bb202d6e1d3c54f8180967b2d6b54750c2d2b

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