Malicious PDF — malware analysis report

Static analysis result for SHA-256 effe5ec857b91e58…

MALICIOUS

PDF

32.1 KB Created: 2021-07-20 07:07:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: b70df63bda0d36fcb8e71a068db2ceb4 SHA-1: 47fe64007809eec55e92852aadc542606c7bbdf4 SHA-256: effe5ec857b91e5861ef09e33c3d6fac3d0370f499ad373c8e021df90c2ae05c
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file 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 0.9900

Heuristics 4

  • 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/how-to-get-minecraft-java-for-free-game-hack PDF link annotation
    • https://www.dealcafe.me/uploaded_files/userfiles/files/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • https://www.dealcafe.me/uploaded_files/userfiles/files/coin-master-free-soins_GM406889139.pdfIn PDF document text
    • https://www.dealcafe.me/uploaded_files/userfiles/files/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • https://www.dealcafe.me/uploaded_files/userfiles/files/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://www.dealcafe.me/uploaded_files/userfiles/files/will-minecraft-dungeons-be-free_GM479516143.pdfIn PDF document text
    • https://www.dealcafe.me/uploaded_files/userfiles/files/free-robux-games-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.dealcafe.me/uploaded_files/userfiles/files/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.dealcafe.me/uploaded_files/userfiles/files/how-to-hack-people-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.dealcafe.me/uploaded_files/userfiles/files/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://www.dealcafe.me/uploaded_files/userfiles/files/coin-master-free-spins-link-2021_GM406889139.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_off00002bbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2BBF 21884 bytes
SHA-256: efb3cfe882acd7077af0dc91687d6827abe8af08bb804cd334e2a3e9800a6aa2
font_01_sfnt_off00005bbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5BBE 18152 bytes
SHA-256: f45ec97da20a8e70f6e7437c3ced33d3bcbd99aef5af4daf3be0ff08d51a9e58

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