Malicious PDF — malware analysis report

Static analysis result for SHA-256 50691995723010c2…

MALICIOUS

PDF

48.5 KB Created: 2021-06-03 15:34:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a3c515f40c5e28eac5286a65c9182d39 SHA-1: 89542662d6c57cd017d373eee431f4799847b495 SHA-256: 50691995723010c23b6d754ee42189b315cd5c32feec1cfb62d39c90f7a5be4d
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 0.9796

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 https://netcdn.online/app/431946152/free-robux-no-verification-game-hack PDF link annotation
    • https://www.jcn.co.uk/uploads/files/files/robuxmatchcom-free-robux_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/free-robux-games-that-actually-work_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/download-coin-master-hack-mod-apk_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/how-do-i-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/free-robux-2021_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/how-to-get-free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/coin-master-card-collection-hack_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/roblox-jailbreak-hack_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/oprewards-com-robux_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/free-minecraft-accounts-reddit_GM479516143.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/blox-pink-robux-free_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/how-to-change-your-name-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/how-to-hack-people-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/free-rare-cards-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/roblox-land-free-robux_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/earn-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/free-robux-codes-not-used_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/how-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000053f3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x53F3 25740 bytes
SHA-256: 5d6a48d1510c14420ffb13a48a90b03c3093c184da049d05b8d0b4c9b13a37c7
font_01_sfnt_off00008ff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FF5 2908 bytes
SHA-256: e28d2c57f35643e2026f86c34ac3bb63cba74be3f6c066e81aba6d285e5a121b
font_02_sfnt_off000099ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x99EF 18600 bytes
SHA-256: 361892a278de990f6dfe9fe9f512a0ec39aeba1740037781b92f32c6ad2b5051

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