Malicious PDF — malware analysis report

Static analysis result for SHA-256 abc5afa52c63718a…

MALICIOUS

PDF

34.0 KB Created: 2021-07-03 22:39:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: def9d84ce116de5f08e5a63471db6595 SHA-1: 53d4939d2e4a0c6bdbbe24f820034c95d1c0a4ac SHA-256: abc5afa52c63718a3d3e409e9a69fad3a969db5df3bbcdabaa5f394f5a7e9334
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF document contains a lure for 'free Robux' and game hacks, directing users to a suspicious URL. This indicates a social engineering tactic to trick users into visiting a potentially malicious site. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. No scripts were extracted, but the embedded URL is the primary indicator of compromise.

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/431946152/free-robux-roblox-hack-no-human-verification-game-hack PDF link annotation
    • https://resmed.ear.com.tw/image/data/files/wwwhaktutsin-2021-08-coinmasterfreespinandcoinlinkhtml-m-1_GM406889139.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/free-coin-master-spin-app_GM406889139.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/free-daily-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/minecraft-win-10-free_GM479516143.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/gamehunters-coin-master_GM406889139.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/cheat-files-download-roblox_GM431946152.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/pokemon-go-free-box-march-2021_GM1094591345.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/minecraft-pe-hack-client_GM479516143.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/coin-master-free-chip_GM406889139.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/kids-games-free-roblox-download_GM431946152.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/coin-master-heaven-free-spins-link_GM406889139.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/roblox-hack-apk-2021_GM431946152.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/roblox-hack-apk-pc-download_GM431946152.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/coin-master-heaven-daily-free-spins_GM406889139.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/roblox-build-a-boat-for-treasure-cross-hack_GM431946152.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/robuxhub-net_GM431946152.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/minecraft-building-hacks_GM479516143.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/coin-master-100-spin-slot_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_off00002f0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F0E 21812 bytes
SHA-256: 0d842ffc3496cd3a5ee9209395e8f9f1061ea055a9b4bff652fe669fa7e70e2d
font_01_sfnt_off00005f25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F25 19392 bytes
SHA-256: 017e90a68126551e0c5977e45fdddb63d4e002009043c64b2d57361f084fc4d5

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