Malicious PDF — malware analysis report

Static analysis result for SHA-256 4130b18a368d7c34…

MALICIOUS

PDF

33.8 KB Created: 2021-07-05 21:52:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: cbdd503cca9a2bd3f02493236e7cb97d SHA-1: a5bd8416d8ccffdda808e3d65aed1a626802ae99 SHA-256: 4130b18a368d7c349c9c3c4f3e1d6404ff80e717e7d93f37316fa79bbfb9955c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure related to free Robux and game hacks, as indicated by the document body and critical heuristic firings. It contains multiple links to known malicious redirector infrastructure, such as http://netcdn.tw/app/431946152/roblox-games-that-give-you-free-robux-game-hack, which likely serves as a gateway to further malicious content or downloads. No scripts were extracted from this sample, but the embedded URLs and the nature of the lure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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/roblox-games-that-give-you-free-robux-game-hack In PDF document text
    • http://regiefranchet.fr/userfiles/files/free-robux-2021-android_GM431946152.pdfIn PDF document text
    • http://regiefranchet.fr/userfiles/files/original-roblox_GM431946152.pdfIn PDF document text
    • http://regiefranchet.fr/userfiles/files/coin-master-free-spin-app-2021_GM406889139.pdfIn PDF document text
    • http://regiefranchet.fr/userfiles/files/roblox-new-free-shirt-template_GM431946152.pdfIn PDF document text
    • http://regiefranchet.fr/userfiles/files/my-roblox-avatar_GM431946152.pdfIn PDF document text
    • http://regiefranchet.fr/userfiles/files/roblox-moderators_GM431946152.pdfIn PDF document text
    • http://regiefranchet.fr/userfiles/files/free-robux-stream_GM431946152.pdfIn PDF document text
    • http://regiefranchet.fr/userfiles/files/roblox-tower-battles-money-hack_GM431946152.pdfIn PDF document text
    • http://regiefranchet.fr/userfiles/files/minecraft-mac-free_GM479516143.pdfIn PDF document text
    • http://regiefranchet.fr/userfiles/files/free-robux-no-verification-2021-ios_GM431946152.pdfIn PDF document text
    • http://regiefranchet.fr/userfiles/files/how-to-get-the-doge-package-for-free-roblox_GM431946152.pdfIn PDF document text
    • http://regiefranchet.fr/userfiles/files/free-spins-coin-master-blogspot_GM406889139.pdfIn PDF document text
    • http://regiefranchet.fr/userfiles/files/robux-free-com_GM431946152.pdfIn PDF document text
    • http://regiefranchet.fr/userfiles/files/is-java-minecraft-free_GM479516143.pdfIn PDF document text
    • http://regiefranchet.fr/userfiles/files/300-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://regiefranchet.fr/userfiles/files/roblox-fixed-free-admin-3_GM431946152.pdfIn PDF document text
    • http://regiefranchet.fr/userfiles/files/robux-gainer_GM431946152.pdfIn PDF document text
    • http://regiefranchet.fr/userfiles/files/op-rewards-free-robux_GM431946152.pdfIn PDF document text
    • http://regiefranchet.fr/userfiles/files/hacked-roblox-accounts-list_GM431946152.pdfIn PDF document text
    • http://regiefranchet.fr/userfiles/files/how-to-make-roblox-clothes-for-free_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_off00002e26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E26 21528 bytes
SHA-256: e0cca85076f5bdb34b7f224ce2ae186926d285006172a5a847663db22732da71
font_01_sfnt_off00005d47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D47 19716 bytes
SHA-256: a049f91da2a5f673ee8bdddb66e04ab16341ee881dfe876bfe6c1856da68d744

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