Malicious PDF — malware analysis report

Static analysis result for SHA-256 337400dcdfd36cbb…

MALICIOUS

PDF

47.7 KB Created: 2021-06-11 04:00:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 7c0d8286571dd3f888b0d698b7a769af SHA-1: 12036aab890112315d302b599694944be5d31058 SHA-256: 337400dcdfd36cbb5ce56af179065787cbd66eeee13cd9d927b96295196251b2
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 0.9832

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.tw/app/431946152/free-roblox-recorder-game-hack PDF link annotation
    • http://autoskola-scp.com/files/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://autoskola-scp.com/files/free-robux-easy-and-fast_GM431946152.pdfIn PDF document text
    • http://autoskola-scp.com/files/coin-master-free-cards-link_GM406889139.pdfIn PDF document text
    • http://autoskola-scp.com/files/hackear-coin-master-sin-verificacion_GM406889139.pdfIn PDF document text
    • http://autoskola-scp.com/files/how-to-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://autoskola-scp.com/files/prestonplayz-hacked-my-roblox-account_GM431946152.pdfIn PDF document text
    • http://autoskola-scp.com/files/how-to-host-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://autoskola-scp.com/files/pubg-uc-yollama_GM1330123889.pdfIn PDF document text
    • http://autoskola-scp.com/files/robux-com-free-robux_GM431946152.pdfIn PDF document text
    • http://autoskola-scp.com/files/codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://autoskola-scp.com/files/minecraft-java-server-hosting-free_GM479516143.pdfIn PDF document text
    • http://autoskola-scp.com/files/minecraft-free-install_GM479516143.pdfIn PDF document text
    • http://autoskola-scp.com/files/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://autoskola-scp.com/files/robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://autoskola-scp.com/files/coin-master-free_GM406889139.pdfIn PDF document text
    • http://autoskola-scp.com/files/how-to-hack-roblox-on-mobile_GM431946152.pdfIn PDF document text
    • http://autoskola-scp.com/files/free-coin-master-spin-daily-link_GM406889139.pdfIn PDF document text
    • http://autoskola-scp.com/files/minecraft-images-free_GM479516143.pdfIn PDF document text
    • http://autoskola-scp.com/files/coin-master-links-to-get-free-spins_GM406889139.pdfIn PDF document text
    • http://autoskola-scp.com/files/hack-download_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
stream_004_off000052cc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52CC 29456 bytes
SHA-256: 355eb22a613d02bba4773399c979cdb27d86f164f454770cf7fe1b26e45e2736
font_01_sfnt_off000093f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x93F5 19652 bytes
SHA-256: e5dfb4995f13affb3a8d2ccf43ce3dd6cc47bec7b87142fc0ccfe0f131cfcb34

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