Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c27893ee11005be…

MALICIOUS

PDF

35.1 KB Created: 2021-07-09 14:32:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 8663e718e59923c293a995c2a7db6167 SHA-1: af25d5f74bd15e35956476a14b50887e6eef74ed SHA-256: 3c27893ee11005be827dbdc706426ef19c235b0eba03df338dd5a6ba81f177a1
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/431946152/free-robux-real-game-hack PDF link annotation
    • https://mobile.connecttravel.com.tw/image/data/files/minecraft-pe-017-0-apk-free-download-android_GM479516143.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/roblox-template-shirt-free-shipping_GM431946152.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/how-to-make-a-free-server-in-minecraft-java_GM479516143.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/coin-master-free-spins-link-cheat_GM406889139.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/how-to-download-minecraft-windows-10-edition-for-free_GM479516143.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/no-human-verification-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/june-29-coin-master-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/free-bedrock-minecraft_GM479516143.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/coin-master-free-spins-and-coins-blogspot_GM406889139.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/free-tiktok-followers-generator_GM835599320.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/how-to-get-free-robux-by-playing-games_GM431946152.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/free-coins-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/taste3-com-roblox-online-hack_GM431946152.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/coin-master-free-cards-link-2021-today_GM406889139.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/roblox-hack-cbro_GM431946152.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/free-robux-hacks-no-verification_GM431946152.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/how-to-download-minecraft-for-free-on-your-phone_GM479516143.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/youtube-cheat-robux_GM431946152.pdfIn PDF document text
    • https://mobile.connecttravel.com.tw/image/data/files/minecraft-windows-10-edition-free-with-java_GM479516143.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
font_00_sfnt_off0000322e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x322E 22632 bytes
SHA-256: 6f06edd20d67db9a2f7baaf38a024f05c2a9e133989ee62b6b949a703fc6538b
font_01_sfnt_off000064d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64D8 18788 bytes
SHA-256: 4bc1fb5241f7d1727492069c2276e888dd2add0fc79522b75a602c51baadbe08

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