Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3eb94c946687091…

MALICIOUS

PDF

34.7 KB Created: 2021-07-05 14:16:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 6f4e9531d1c4ecb6b58b4bb732baedec SHA-1: 88cde8c7ba8806098f7bbac9bdc6479b4f1289b7 SHA-256: c3eb94c9466870915612d583344c58afcf750ce538b90a3bae293a6b48415453
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/free-minecraft-education-edition-game-hack PDF link annotation
    • https://razredna-nastava.net/files/how-to-get-free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/hackear-prison-life-roblox-2021-pc_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/coin-master-free-spin-daily-link_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/coin-master-free-download-app_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/coin-master-hack-tool-for-pc_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/how-to-get-free-roblox-hack_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/vpn-for-tiktok-free_GM835599320.pdfIn PDF document text
    • https://razredna-nastava.net/files/earn-free-robux_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/how-to-get-free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/robux-come_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/roblox-aimbot-hack-for-nerf-fps_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/cheat-engine-and-roblox_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/jailbreak-roblox-cheat-may-20-2021_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/how-to-get-free-robux-2021-not-fake-ral-2021_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/coin-master-mod-apk-hack_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/free-roblox-svg_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/roblox-royale-high-how-to-get-free-diamonds-2021_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/easy-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/robux-matchcomfree-robux_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/pubg-uc-myanmar_GM1330123889.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_off000032ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32EC 22480 bytes
SHA-256: da1d5fd9b4c5623824d0355d57cc4fc5bf0165b94dbf4814ee4fb7ee08663775
font_01_sfnt_off00006517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6517 18312 bytes
SHA-256: ea04fd3d915771084383886fc7ce1b63e4bd6f30d828a1dfcfd5e13c50d9d279

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