Malicious PDF — malware analysis report

Static analysis result for SHA-256 edc7e5f37869fb65…

MALICIOUS

PDF

35.9 KB Created: 2021-06-28 00:46:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 2e25e3e270074a7fb4c98313edecea0a SHA-1: bfa78538579239b1761cabe3c8f43b34dccaf4b1 SHA-256: edc7e5f37869fb65e941bf41c84ed4eddae572a711e0d462fc4d5d7ef88d6a1d
142 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, 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 0.9980

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/roblox-titanic-free-radi-ov3rmillion-game-hack PDF link annotation
    • https://khavarrooy.com/assets/uploads/pages/files/free-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • https://khavarrooy.com/assets/uploads/pages/files/coin-master-hack-apk-july-29_GM406889139.pdfIn PDF document text
    • https://khavarrooy.com/assets/uploads/pages/files/roblox-redeem-card-codes-free_GM431946152.pdfIn PDF document text
    • https://khavarrooy.com/assets/uploads/pages/files/hacking-apps-for-roblox_GM431946152.pdfIn PDF document text
    • https://khavarrooy.com/assets/uploads/pages/files/roblox-accounts-for-sale-free_GM431946152.pdfIn PDF document text
    • https://khavarrooy.com/assets/uploads/pages/files/como-descargar-coin-master-hackeado_GM406889139.pdfIn PDF document text
    • https://khavarrooy.com/assets/uploads/pages/files/coin-master-apk-hack-2021-ios_GM406889139.pdfIn PDF document text
    • https://khavarrooy.com/assets/uploads/pages/files/minecraft-wurst-client_GM479516143.pdfIn PDF document text
    • https://khavarrooy.com/assets/uploads/pages/files/best-free-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • https://khavarrooy.com/assets/uploads/pages/files/free-spins-coin-master-links-2021_GM406889139.pdfIn PDF document text
    • https://khavarrooy.com/assets/uploads/pages/files/earn-free-robux-for-roblox_GM431946152.pdfIn PDF document text
    • https://khavarrooy.com/assets/uploads/pages/files/coin-master-free-spins-links-2021_GM406889139.pdfIn PDF document text
    • https://khavarrooy.com/assets/uploads/pages/files/coin-master-hack-download-android_GM406889139.pdfIn PDF document text
    • https://khavarrooy.com/assets/uploads/pages/files/coin-master-free-generator_GM406889139.pdfIn PDF document text
    • https://khavarrooy.com/assets/uploads/pages/files/what-do-points-do-in-roblox_GM431946152.pdfIn PDF document text
    • https://khavarrooy.com/assets/uploads/pages/files/free-robux-real-working_GM431946152.pdfIn PDF document text
    • https://khavarrooy.com/assets/uploads/pages/files/free-coins-for-flip-master-online_GM406889139.pdfIn PDF document text
    • https://khavarrooy.com/assets/uploads/pages/files/coin-master-free-cards-link_GM406889139.pdfIn PDF document text
    • https://khavarrooy.com/assets/uploads/pages/files/coin-master-card-link-free_GM406889139.pdfIn PDF document text
    • https://khavarrooy.com/assets/uploads/pages/files/hack-roblox-dragon-ball-rage-2021_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_off0000329e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x329E 22740 bytes
SHA-256: 07c0fa3ad757c650319d62044b74e47b0c1a3a9e45faa9c6d066038fe8daedd3
font_01_sfnt_off000065a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65A6 19596 bytes
SHA-256: c93cce595deaeab426ce619b63741c8f789c782c8001a70d3e18204b167c9147

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