Malicious PDF — malware analysis report

Static analysis result for SHA-256 efef396e6319a66b…

MALICIOUS

PDF

34.6 KB Created: 2021-07-04 01:54:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 1e0cec02825d6f2ac574c38ecb5cbe90 SHA-1: 48c5a57f6df1e41b2a16711b2dbdaf439b0592ce SHA-256: efef396e6319a66b3f1d95aabc063da5230ed9f8183c069e357fe95ebbc551fd
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a heuristic firing for a 'free generator / game hack' lure, directing users to a suspicious URL. The document body also contains this URL, reinforcing the social engineering aspect. The ML classifier strongly indicates maliciousness. The primary attack vector appears to be a phishing attempt via a malicious attachment, leading to a redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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/minecraft-windows-10-free-game-hack PDF link annotation
    • https://flyingchalks.com/ckfinder/userfiles/files/free-tix-and-robux-website_GM431946152.pdfIn PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/minecraft-bedrock-free-server-hosting_GM479516143.pdfIn PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/roblox-sued_GM431946152.pdfIn PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/code-roblox-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/coin-master-free-spin-codes_GM406889139.pdfIn PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/how-to-get-free-robux-using-startingploit_GM431946152.pdfIn PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/how-to-install-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/roblox-free-item-codes-2021_GM431946152.pdfIn PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/minecraft-mods-download-free_GM479516143.pdfIn PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/coin-master-card-hack-app_GM406889139.pdfIn PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/roblox-broken-bones-4-cheat-engine_GM431946152.pdfIn PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/roblox-promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/how-to-get-minecoins-in-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/roblox-free-1-million-robux_GM431946152.pdfIn PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/game-toolbox_GM479516143.pdfIn PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/how-to-hack-roblox-2021_GM431946152.pdfIn PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/how-to-speed-hack-on-roblox-without-cheat-engine-2021_GM431946152.pdfIn PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/free-robux-hacker-us_GM431946152.pdfIn PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/cara-cheat-roblox-mining-simulator_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_off0000322e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x322E 22088 bytes
SHA-256: 175f62f7efa7e7731f57f67d1b575f4da231347e1eafd7248c425444195dfd31
font_01_sfnt_off000062e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62E6 18812 bytes
SHA-256: 64384bfcc58c1bbdf03ee3f883a0be16d7cce96ae7e77f1df9d799b764379cfd

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