Malicious PDF — malware analysis report

Static analysis result for SHA-256 d81a80423fb69f6c…

MALICIOUS

PDF

42.2 KB Created: 2021-05-12 02:38:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: df7943f14c901c9ca97c2f230721caee SHA-1: 157cf9f7621961f25f7a308c3d1fab1f114a38d0 SHA-256: d81a80423fb69f6c9122ccf83c869ee7ac01d03ccc8ef8254e70788718910dff
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple external links, including one to 'netcdn.xyz' which is flagged as a lure for game hacks. The ML classifier also identified the PDF as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the lure suggest an attempt to redirect the user to a malicious site, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 4

  • 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.
  • 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.xyz/app/406889139/free-spin-today-coin-master-game-hack PDF link annotation
    • https://www.donjastubica.hr/files/free-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.donjastubica.hr/files/master-coin-free-spin_GM406889139.pdfIn PDF document text
    • http://www.donjastubica.hr/files/free-coin-master-coins_GM406889139.pdfIn PDF document text
    • http://www.donjastubica.hr/files/get-me-robux-for-free_GM431946152.pdfIn PDF document text
    • http://www.donjastubica.hr/files/roblox-rape-hack_GM431946152.pdfIn PDF document text
    • http://www.donjastubica.hr/files/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • http://www.donjastubica.hr/files/hackear-coin-master-sin-verificacion_GM406889139.pdfIn PDF document text
    • https://www.donjastubica.hr/files/free-links-coin-master_GM406889139.pdfIn PDF document text
    • https://www.donjastubica.hr/files/how-to-hack-roblox_GM431946152.pdfIn PDF document text
    • https://www.donjastubica.hr/files/free-daily-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.donjastubica.hr/files/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://www.donjastubica.hr/files/how-to-get-free-robux-com_GM431946152.pdfIn PDF document text
    • https://www.donjastubica.hr/files/coin-master-free-2021_GM406889139.pdfIn PDF document text
    • http://www.donjastubica.hr/files/codes-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.donjastubica.hr/files/i-got-hacked-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.donjastubica.hr/files/new-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.donjastubica.hr/files/coin-master-hack-injection_GM406889139.pdfIn PDF document text
    • http://www.donjastubica.hr/files/roblox-free-download_GM431946152.pdfIn PDF document text
    • http://www.donjastubica.hr/files/hack-coin-master-apk-2021_GM406889139.pdfIn PDF document text
    • https://www.donjastubica.hr/files/roblox-free-rubox_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_003_off00004abb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4ABB 24476 bytes
SHA-256: 7ee04e4ccc646f82b283da30db24d6a73ae60dcca182fa4d9beb0108e4d5ba14
font_01_sfnt_off000082c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82C9 18240 bytes
SHA-256: 78c04cb83b3c312ccbbb37a13dd02ec2cfa8937d686ae670a5893e360fd0758d

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