Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3e9e753a7dccfc6…

MALICIOUS

PDF

49.6 KB Created: 2021-06-07 00:50:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 1faab59ef75ec771036acae64399702e SHA-1: aa14e49f9a36ec1e2357a880f86817c8eb4b3ed6 SHA-256: d3e9e753a7dccfc65e3ea91228ee193cda7b3ac4ca1dfe80fcdc9d1ea663f597
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.tw/app/431946152/easy-roblox-hacks-for-sword-art-online-game-hack PDF link annotation
    • http://torkelson.se/images/coin-master-free-spin-link-app_GM406889139.pdfIn PDF document text
    • http://torkelson.se/images/free-roblox-accounts-with-robux-2021_GM431946152.pdfIn PDF document text
    • http://torkelson.se/images/daily-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://torkelson.se/images/how-do-you-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://torkelson.se/images/minecraft-for-chromebook-free_GM479516143.pdfIn PDF document text
    • http://torkelson.se/images/how-do-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://torkelson.se/images/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://torkelson.se/images/can-you-make-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://torkelson.se/images/earn-robux_GM431946152.pdfIn PDF document text
    • http://torkelson.se/images/get-free-robux-today_GM431946152.pdfIn PDF document text
    • http://torkelson.se/images/roblox-games-with-free-radio_GM431946152.pdfIn PDF document text
    • http://torkelson.se/images/free-robux-codes-generator_GM431946152.pdfIn PDF document text
    • http://torkelson.se/images/free-minecraft-java-edition-account_GM479516143.pdfIn PDF document text
    • http://torkelson.se/images/pokemon-go-free-install_GM1094591345.pdfIn PDF document text
    • http://torkelson.se/images/free-robux-discord-servers_GM431946152.pdfIn PDF document text
    • http://torkelson.se/images/coin-master-rewards-free-spins_GM406889139.pdfIn PDF document text
    • http://torkelson.se/images/roblox-arsenal-hack-script-pastebin_GM431946152.pdfIn PDF document text
    • http://torkelson.se/images/play-roblox-free-online_GM431946152.pdfIn PDF document text
    • http://torkelson.se/images/robux-free-co_GM431946152.pdfIn PDF document text
    • http://torkelson.se/images/cheats-coin-master-free_GM406889139.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_off0000510a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x510A 26452 bytes
SHA-256: c30f7ddd8060bac892d5fd03ca699aa8acee4e66cb7edb71a403d7ef8a603dd5
font_01_sfnt_off00008ece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8ECE 4064 bytes
SHA-256: 31f04801781efc7afb12ee9ec457ec67b547e0355746c78d4cd07ebbcac56535
font_02_sfnt_off00009ca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9CA5 19088 bytes
SHA-256: 7f0d1a6fc64df63964f63b524fb937065896cb29ccb1f82f8ed2263b66e39e95

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