Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cb832bffefa3212…

MALICIOUS

PDF

35.4 KB Created: 2021-07-06 08:30:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 42ccd5a121ef8a6827caf871a5a507e8 SHA-1: 8f785dca4274c086f1a3ba620ae32424c567b218 SHA-256: 6cb832bffefa3212b572f2cf8981f71ff03f0e562b6f99d7a24238868245fe10
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/479516143/can-i-play-minecraft-for-free-game-hack PDF link annotation
    • https://vieclamjapan.com/upload/files/best-free-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/roblox-hacks-mega_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/minecraft-maps-pe-free-download_GM479516143.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/free-download-roblox-infinite-jump-real_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/coin-master-free-spins-haktuts_GM406889139.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/how-to-hack-roblox-high-school-2_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/how-to-hack-someones-roblox-account-2021_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/how-can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/tiktok-free-robux-codes_GM835599320.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/how-to-hack-into-someones-roblox-account_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/free-tiktok-accounts-and-passwords_GM835599320.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/free-spins-coin-master-twitter_GM406889139.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/roblox-hack-scripts-admin_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/roblox-legendary-football-vip-server-free-2021_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/free-robux-hacks-no-verification_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/roblox-hack-stage-samim-sinim-youtube-aid_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/robux-hack-generator-without-human-verification_GM431946152.pdfIn PDF document text
    • https://vieclamjapan.com/upload/files/how-to-get-free-unlimited-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3368 23200 bytes
SHA-256: 16c1cf57796b1fb8b1106d864a7172729970117f27db383fa7bfa21e2cd5aae8
font_01_sfnt_off00006783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6783 18408 bytes
SHA-256: 22e68a0867652c0803059ede6b7bd21e7baaf57de2707374363b6777f36fc467

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