Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecd7f4fde0d379e2…

MALICIOUS

PDF

34.5 KB Created: 2021-07-06 02:19:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a478a5600fef9ce01cfd55a87623f3ae SHA-1: 1292e1d9aa9816863658366fd31842a35e8179a6 SHA-256: ecd7f4fde0d379e2c8c7018ff61767ec912b689c57d94b73ead07490be32422c
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/minecraft-free-download-unblocked-game-hack PDF link annotation
    • http://library.futureuniversity.com/repository/get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/roblox-voo-hack-com_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/free-op-minecraft-servers_GM479516143.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/how-to-hack-coin-master-spin-ios_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/prison-vs-pro-vs-hacker-roblox_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/roblox-hack-game_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/coin-master-free-coins-twitter_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/coin-master-free-spins-link-2021-app_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/how-to-get-free-roebucks-in-roblox-2021_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/roblox-galaxy-shirt-free-shipping_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/tiktok-free-song_GM835599320.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/free-account-roblox-2021_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/getrobux-me-roblox-online-hack_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/coin-master-free-spins-activegamer_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/coin-master-daily-gift-free-spins-and-coins-link-today_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/roblox-online-free_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/hack-coin-master-for-android_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/free-robux-script_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_off00003118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3118 22088 bytes
SHA-256: a4a184dad494959c82bb07613142f0eb6191ba366c776477d60bf84b7ac39646
font_01_sfnt_off000061b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61B2 19092 bytes
SHA-256: b89de8ec978c760e16c728bf26098254cc88868f8675788ef266acc2a2d3d026

Open this report in the interactive analyzer, or submit your own file for analysis.