Malicious PDF — malware analysis report

Static analysis result for SHA-256 65554018cfffb5a3…

MALICIOUS

PDF

41.6 KB Created: 2021-05-10 18:43:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 4ef148b7460a7a223f7c0ab2bf901767 SHA-1: 6838ef9466f187d41cbfc5e306332b1473cba83d SHA-256: 65554018cfffb5a379c07443fb3d7765cf8f9f4841abd77d36e7f49a4532abeb
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a high-confidence heuristic firing for a game hack lure, directing users to a suspicious URL. The document body, though heavily corrupted, contains text related to game hacks and the malicious URL. The presence of numerous other PDF links on similar topics further supports the malicious intent of this document.

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/hack-coin-master-download-game-hack PDF link annotation
    • https://corbo.ru/images/free-robux-that-actually-works-2021_GM431946152.pdfIn PDF document text
    • https://corbo.ru/images/where-to-get-robux_GM431946152.pdfIn PDF document text
    • https://corbo.ru/images/free-gold-cards-coin-master_GM406889139.pdfIn PDF document text
    • https://corbo.ru/images/roblox-arsenal-hack_GM431946152.pdfIn PDF document text
    • https://corbo.ru/images/easy-robux_GM431946152.pdfIn PDF document text
    • https://corbo.ru/images/free-minecraft-texture-packs_GM479516143.pdfIn PDF document text
    • https://corbo.ru/images/coin-master-free-2021_GM406889139.pdfIn PDF document text
    • https://corbo.ru/images/coin-master-daily-free-spins-25_GM406889139.pdfIn PDF document text
    • https://corbo.ru/images/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://corbo.ru/images/instant-robux_GM431946152.pdfIn PDF document text
    • https://corbo.ru/images/minecraft-114-download_GM479516143.pdfIn PDF document text
    • https://corbo.ru/images/free-roblox-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • https://corbo.ru/images/free-robux-mobile_GM431946152.pdfIn PDF document text
    • https://corbo.ru/images/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://corbo.ru/images/free-robux-generator-2021-no-survey_GM431946152.pdfIn PDF document text
    • https://corbo.ru/images/free-robux-download_GM431946152.pdfIn PDF document text
    • https://corbo.ru/images/how-many-levels-does-coin-master-have_GM406889139.pdfIn PDF document text
    • https://corbo.ru/images/coin-master-100-free-spins-link_GM406889139.pdfIn PDF document text
    • https://corbo.ru/images/coin-master-hack-using-cheat-engine_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_off000047f8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47F8 24916 bytes
SHA-256: 1d755dbcdb2c608782547ee264b9fdc811b36a4600e609e5f89551e43b9d8ecc
font_01_sfnt_off00007fe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FE4 18296 bytes
SHA-256: 5719de20b3226af2bdcbf6ff002d7cecdad7590bfdf105e8aa16a01d29572d54