Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1d700daaf3d2b00…

MALICIOUS

PDF

34.6 KB Created: 2021-07-04 07:59:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 2293d6c1ece0db7f369d2913f7b9b7d9 SHA-1: dce608838215461ba6b84089e7162656fef5b584 SHA-256: e1d700daaf3d2b00e306027fdedfd8462d4c0ed919f954b29208c82bdb2daec8
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.tw/app/431946152/free-roblox-hair-to-wear-game-hack PDF link annotation
    • https://www.thekukkad.com/uploaded_files/userfiles/files/mining-simulator-hack-roblox-cheat-engine_GM431946152.pdfIn PDF document text
    • https://www.thekukkad.com/uploaded_files/userfiles/files/best-free-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • https://www.thekukkad.com/uploaded_files/userfiles/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://www.thekukkad.com/uploaded_files/userfiles/files/how-to-get-free-money-in-adopt-me-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.thekukkad.com/uploaded_files/userfiles/files/how-to-get-bear-face-mask-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://www.thekukkad.com/uploaded_files/userfiles/files/hacks-para-roblox-jailbreak-2021_GM431946152.pdfIn PDF document text
    • https://www.thekukkad.com/uploaded_files/userfiles/files/free-draw-roblox_GM431946152.pdfIn PDF document text
    • https://www.thekukkad.com/uploaded_files/userfiles/files/minecraft-windows-10-edition-hacked-client_GM479516143.pdfIn PDF document text
    • https://www.thekukkad.com/uploaded_files/userfiles/files/free-robux-hack-generator-app_GM431946152.pdfIn PDF document text
    • https://www.thekukkad.com/uploaded_files/userfiles/files/roblox-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • https://www.thekukkad.com/uploaded_files/userfiles/files/free-admin-no-download-roblox_GM431946152.pdfIn PDF document text
    • https://www.thekukkad.com/uploaded_files/userfiles/files/how-to-get-free-5-robux_GM431946152.pdfIn PDF document text
    • https://www.thekukkad.com/uploaded_files/userfiles/files/minecraft-noob-vs-pro-vs-hacker-vs-noob-roblox_GM431946152.pdfIn PDF document text
    • https://www.thekukkad.com/uploaded_files/userfiles/files/free-robux-apk_GM431946152.pdfIn PDF document text
    • https://www.thekukkad.com/uploaded_files/userfiles/files/all-free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • https://www.thekukkad.com/uploaded_files/userfiles/files/get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • https://www.thekukkad.com/uploaded_files/userfiles/files/free-robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • https://www.thekukkad.com/uploaded_files/userfiles/files/coin-master-free-coins-and-spins-link_GM406889139.pdfIn PDF document text
    • https://www.thekukkad.com/uploaded_files/userfiles/files/how-to-get-free-robux-for-free_GM431946152.pdfIn PDF document text
    • https://www.thekukkad.com/uploaded_files/userfiles/files/how-can-u-get-free-robux_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_off000030b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30B1 22344 bytes
SHA-256: fac7d6cac919fac02e3ef000e6eb39450c812d04f9f4c30b75e309bf30d3207b
font_01_sfnt_off0000628e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x628E 18968 bytes
SHA-256: 6830364f4dd1ddd86c6562c867680beb6ccb518dd817f0071f92a4a80892b398

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