Malicious PDF — malware analysis report

Static analysis result for SHA-256 b70eff22c3de5d38…

MALICIOUS

PDF

43.4 KB Created: 2021-05-16 16:45:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 0452fcee97e6987762151fab4c0e30c0 SHA-1: 217e71af534194085f85784b758b8e7f06d633fc SHA-256: b70eff22c3de5d38c2b4dae099b76d31bb9e2396cf119d3163efcda18a179404
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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/479516143/how-to-get-free-skins-in-minecraft-game-hack PDF link annotation
    • http://www.riverkennet.org/uploads/files/files/free-robux-hacks-no-verification_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/roblox-free-followers_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/unlimited-robux_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/rbxfree-com-free-robux_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/coin-master-free-spins-link-facebook-page_GM406889139.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/free-spins-coin-master-2021-no-verification_GM406889139.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/free-robux-com-no-verification_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/i-need-robux_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/can-you-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/code-free-robux_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/claimrbx-free-robux_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/minecraft-pe-apk-free-download_GM479516143.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/coin-master-hack-apk-online_GM406889139.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/earn-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/free-robux-no-apps_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/how-to-get-free-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/real-robux-generator_GM431946152.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/coin-master-online-hack-link_GM406889139.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/coin-master-fb-free-spins-link_GM406889139.pdfIn PDF document text
    • http://www.riverkennet.org/uploads/files/files/how-do-you-get-free-pet-food-in-coin-master_GM406889139.pdfIn PDF document text
    • https://discord.ggIn 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_off00004dfa.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4DFA 25560 bytes
SHA-256: 29179f044a8db44b65d8e62b087613f402a0249227841f48da18a4bfc0c0a5d7
font_01_sfnt_off00008836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8836 18044 bytes
SHA-256: 6cc59c28d5557832b1af72f7b0f143d8adff3a85e9aacd177c0586c4e7a11f45

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