Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff0aa62f1533b60b…

MALICIOUS

PDF

51.9 KB Created: 2021-06-03 22:00:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: a4ab2e2b38dd34930c8543f89278508c SHA-1: 97c5789f6e27aea72a4b4c9edeee6b8352678d86 SHA-256: ff0aa62f1533b60ba787fa767c6a7ea496b99f287cc1b4cb05547ba5c1cf6a8c
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a lure for game hacks, directing users to a suspicious URL. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content, likely for malware delivery or credential harvesting. The ML classifier strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9657

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.online/app/406889139/how-to-hack-coin-master-with-root-game-hack PDF link annotation
    • http://www.js100.com/uploads/ckeditor/files/bux-free-robux_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-village-4_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/you-promised-my-son-free-robux_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/www-free-robux-com_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/classic-minecraft-net-hacks_GM479516143.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/how-to-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-tiktok-fans-no-human-verification-or-downloading-apps_GM835599320.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/links-for-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/how-to-hack-to-get-robux_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/minecraft-pocket-edition-hack_GM479516143.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/how-to-hack-coin-master-with-root_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-link-for-spins_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/how-to-earn-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/how-to-hack-a-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-robux-no-scam_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-roblox-injector_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/clean-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-hack-app-2021_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-coins-and-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000056f3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x56F3 24968 bytes
SHA-256: c08c446c0b081df792fe9ea083bccdf4ccd3adcbf1e7aa52351d02c32f09d229
font_01_sfnt_off0000901f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x901F 4128 bytes
SHA-256: e19229282826e6d52caa26c8375af19ab77bd3f57048dc578a6e669876579f2d
font_02_sfnt_off00009e42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9E42 2788 bytes
SHA-256: 6fd7c7f447d66842f81aa8cf197935b17f22157d0c7e9f95622df1b5b4ddf530
font_03_sfnt_off0000a831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA831 18244 bytes
SHA-256: 637569eb8644e62c1f2e57bc91b52f312ba00adc0fcd5632e53c8f2fa316043a

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