Malicious PDF — malware analysis report

Static analysis result for SHA-256 81cc40da942ee0b0…

MALICIOUS

PDF

35.2 KB Created: 2021-06-22 09:39:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 63ae9191f6e7faadc97caec15f9906e2 SHA-1: dfe8161802dcb2c692a646b78e460df3c0cbdee5 SHA-256: 81cc40da942ee0b071fa6bf2e5d33d7373735461cce9df14ea15edad898902ea
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are hosted on 'limebug.com' and appear to be part of a link farm designed to attract users searching for game hacks and free currency. The primary URL, http://netcdn.co/app/431946152/how-to-get-free-robux-code-easy-free-robux-codes-game-hack, is directly associated with a 'free robux' lure. The presence of a 'PDF_SEO_LINK_FARM' heuristic firing further supports the conclusion that this document is designed for malicious redirection, likely to phishing sites or to initiate further malicious downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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 http://netcdn.co/app/431946152/how-to-get-free-robux-code-easy-free-robux-codes-game-hack PDF link annotation
    • https://limebug.com/media/storage/editor/files/coin-master-free-spins-through-coin-pop_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/free-spins-coin-master-haktuts_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/can-you-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/easy-way-to-get-robux_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/free-robux-codes_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/free-roblox-printables_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/como-hackear-coin-master-sin-verificacion-humana_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/free-roblox-accounts-2021-with-robux_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/free-robux-meme_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/hack-para-poder-hackear-en-roblox-2021_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/irobux-com-free-robux_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/minecraft-free-school_GM479516143.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/minecraft-dungeons-free-download-pc_GM479516143.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/get-free-robux-no-inspect-fake_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/diamond-cheat-roblox_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/apps-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/how-to-get-free-robux-through-ads_GM431946152.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/coin-master-free-spins-deutsch-download-ios-link_GM406889139.pdfIn PDF document text
    • https://limebug.com/media/storage/editor/files/roblox-police-free_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_off00003258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3258 22140 bytes
SHA-256: 2b3906a5aef0a9c3c0a4790898b1ce466fed41e90b3c362006918b14801d2d5b
font_01_sfnt_off0000635d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x635D 19340 bytes
SHA-256: 80554eb038749e886606d6698236e2edcf02ed096d9194cd10705b95466dd481

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