Malicious PDF — malware analysis report

Static analysis result for SHA-256 09ac3971b5d08dbc…

MALICIOUS

PDF

54.0 KB Created: 2021-06-11 01:22:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: bfe952ded567c4db6de197f7527a9f75 SHA-1: 5ea40cb6863389274683f415f7f5fff5b121356e SHA-256: 09ac3971b5d08dbc3ac02f95beec6e232529c23ce00f29fc4b245a0700a44180
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains multiple embedded URLs that lure users with promises of 'free Robux' or game hacks. The primary URL, https://netcdn.tw/app/431946152/html-for-free-robux-game-hack, is directly linked to a heuristic firing indicating a game hack redirector. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest a phishing or malware distribution attempt, likely leveraging a web-based exploit or redirector to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9636

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 https://netcdn.tw/app/431946152/html-for-free-robux-game-hack PDF link annotation
    • http://artistaone.co/userfiles/files/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
    • http://artistaone.co/userfiles/files/coin-master-free-spins-cash_GM406889139.pdfIn PDF document text
    • http://artistaone.co/userfiles/files/free-robux-app_GM431946152.pdfIn PDF document text
    • http://artistaone.co/userfiles/files/hack-to-have-infinite-in-roblox-super-power-training-simulator_GM431946152.pdfIn PDF document text
    • http://artistaone.co/userfiles/files/free-robux-easy_GM431946152.pdfIn PDF document text
    • http://artistaone.co/userfiles/files/actual-free-robux_GM431946152.pdfIn PDF document text
    • http://artistaone.co/userfiles/files/javascript-free-robux_GM431946152.pdfIn PDF document text
    • http://artistaone.co/userfiles/files/how-to-get-minecraft-for-free-on-android_GM479516143.pdfIn PDF document text
    • http://artistaone.co/userfiles/files/coin-master-haktuts_GM406889139.pdfIn PDF document text
    • http://artistaone.co/userfiles/files/pubg-600-uc-in-pakistani-rupees_GM1330123889.pdfIn PDF document text
    • http://artistaone.co/userfiles/files/roblox-jailbreak-hack-download_GM431946152.pdfIn PDF document text
    • http://artistaone.co/userfiles/files/coin-master-free-spins-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • http://artistaone.co/userfiles/files/coin-master-unlimited-coins-hack-apk-download_GM406889139.pdfIn PDF document text
    • http://artistaone.co/userfiles/files/can-you-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • http://artistaone.co/userfiles/files/toolbox-mod_GM479516143.pdfIn PDF document text
    • http://artistaone.co/userfiles/files/how-to-get-minecraft-windows-10-for-free-2021_GM479516143.pdfIn PDF document text
    • http://artistaone.co/userfiles/files/can-you-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://artistaone.co/userfiles/files/free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://artistaone.co/userfiles/files/coin-master-claim-free-spins_GM406889139.pdfIn PDF document text
    • http://artistaone.co/userfiles/files/roblox-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://rblx.landIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005485.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5485 37144 bytes
SHA-256: 571aae44ab81b28ca165c754c1dad17b4bae0e2d95751e077ac0ab0fdd9823b8
font_01_sfnt_off0000a6e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA6E2 2828 bytes
SHA-256: db1860fd79a3f2cbe32e2bada3ba4c68a2d581b7a24294387cd777233cc9cef6
font_02_sfnt_off0000b099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB099 18452 bytes
SHA-256: f1c519e6d75a0cf9c4ce0a909f995cecfb2edd51b93c0e401f20b5faccba4b01

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