Malicious PDF — malware analysis report

Static analysis result for SHA-256 057e7d8a681e6310…

MALICIOUS

PDF

41.5 KB Created: 2021-05-17 09:05:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 3678db9fd0b7c11874ecba5d042a645e SHA-1: fac572876db71f2df6bb18edbf029d4df339f85f SHA-256: 057e7d8a681e6310eb2f07b0d93cb9f1de30a213981e41dbb47eb52b1d3892fd
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically promoting "free Robux" and "game hacks" to lure users. The primary redirector, https://netcdn.xyz/app/431946152/rbxfree-com-free-robux-game-hack, is a critical finding. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a social engineering attack aimed at driving traffic to potentially malicious sites. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://netcdn.xyz/app/431946152/rbxfree-com-free-robux-game-hack In PDF document text
    • http://kundentest.de/images/coin-master-hack-app-link_GM406889139.pdfIn PDF document text
    • http://kundentest.de/images/how-to-hack-coin-master-game_GM406889139.pdfIn PDF document text
    • http://kundentest.de/images/microsoft-free-robux_GM431946152.pdfIn PDF document text
    • http://kundentest.de/images/links-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://kundentest.de/images/free-robux-scams_GM431946152.pdfIn PDF document text
    • http://kundentest.de/images/how-to-make-a-minecraft-server-for-free-java_GM479516143.pdfIn PDF document text
    • http://kundentest.de/images/wurst-112_GM479516143.pdfIn PDF document text
    • http://kundentest.de/images/roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://kundentest.de/images/roblox-mobile-hack_GM431946152.pdfIn PDF document text
    • http://kundentest.de/images/coin-master-shield-hack_GM406889139.pdfIn PDF document text
    • http://kundentest.de/images/coin-master-spin-and-coins-free_GM406889139.pdfIn PDF document text
    • http://kundentest.de/images/can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://kundentest.de/images/free-robux-app_GM431946152.pdfIn PDF document text
    • http://kundentest.de/images/free-robux-group_GM431946152.pdfIn PDF document text
    • http://kundentest.de/images/free-roblox-characters_GM431946152.pdfIn PDF document text
    • http://kundentest.de/images/robux-in_GM431946152.pdfIn PDF document text
    • http://kundentest.de/images/mcpe-master-coin-hack-apk_GM406889139.pdfIn PDF document text
    • http://kundentest.de/images/free-spins-on-coin-master-link_GM406889139.pdfIn PDF document text
    • http://kundentest.de/images/coin-master-attack-hack_GM406889139.pdfIn PDF document text
    • http://kundentest.de/images/coin-master-daily-free-spins-and-coins_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_off000047f3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47F3 24544 bytes
SHA-256: f2ba893c3dfa52013cac60ba76e6462a0ab07df0c8903559aa37da336877024f
font_01_sfnt_off00007ff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FF3 18276 bytes
SHA-256: 3458f47f0b0e4c5d178391a23bbf01d917f000ba7933fbc297d15d2e5240f022

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