Malicious PDF — malware analysis report

Static analysis result for SHA-256 3626b2edc8e4cde1…

MALICIOUS

PDF

33.5 KB Created: 2021-06-27 22:34:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: df1dcdff527694e8d894b46ab413abc3 SHA-1: d662d0140408b6d545360ef392d9a984b5abb6cc SHA-256: 3626b2edc8e4cde11158be9d5fba87a32796ef1a975413cec13dad5658e5c718
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.co/app/431946152/roblox-hacks-kostenlos-game-hack PDF link annotation
    • https://elearning.mtsn5blitar.com/__statics/gudangsoal/files/coin-master-heaven-free-spins-today_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn5blitar.com/__statics/gudangsoal/files/robux-com-free_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn5blitar.com/__statics/gudangsoal/files/free-roblox-script-executor_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn5blitar.com/__statics/gudangsoal/files/free-spin-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn5blitar.com/__statics/gudangsoal/files/how-to-get-free-minecoins-in-minecraft_GM479516143.pdfIn PDF document text
    • https://elearning.mtsn5blitar.com/__statics/gudangsoal/files/free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn5blitar.com/__statics/gudangsoal/files/coin-master-hack-version_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn5blitar.com/__statics/gudangsoal/files/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn5blitar.com/__statics/gudangsoal/files/how-to-get-free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn5blitar.com/__statics/gudangsoal/files/coin-master-daily-free-spins-link-app_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn5blitar.com/__statics/gudangsoal/files/pop-slots-free-vegas-casino-slot-machine-game-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn5blitar.com/__statics/gudangsoal/files/free-tiktok-likes_GM835599320.pdfIn PDF document text
    • https://elearning.mtsn5blitar.com/__statics/gudangsoal/files/coin-master-hack-mod-apk-2021_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn5blitar.com/__statics/gudangsoal/files/minecraft-games-to-play-for-free_GM479516143.pdfIn PDF document text
    • https://elearning.mtsn5blitar.com/__statics/gudangsoal/files/roblox-hack-me-robux_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn5blitar.com/__statics/gudangsoal/files/how-to-get-guns-in-roblox-hack_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn5blitar.com/__statics/gudangsoal/files/give-me-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn5blitar.com/__statics/gudangsoal/files/pubg-uc-daraz_GM1330123889.pdfIn PDF document text
    • https://elearning.mtsn5blitar.com/__statics/gudangsoal/files/coin-master-free-spins-hack_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn5blitar.com/__statics/gudangsoal/files/roblox-codes-to-get-free-items_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
font_00_sfnt_off00002e79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E79 21916 bytes
SHA-256: 875360fbf5a7b6f5ce48267b18fba55ca907107edd0e099dc7015b54ca73278c
font_01_sfnt_off00005eaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EAA 18760 bytes
SHA-256: 8070ae77558c384a6e4690b1f361a729acca411648f47c977341124bf44f267e

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