Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fbe0f59fa798fac…

MALICIOUS

PDF

33.8 KB Created: 2021-07-09 18:10:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: aacebc3092a9565d1dcda5db58710f0a SHA-1: 0f6a8fa8d2400204e06049735cb877f6ae64739f SHA-256: 0fbe0f59fa798fac45da1220d4f92573ff850a64e16a8b45bf89bbb78f4b3459
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links, including one identified as a malicious redirector, that lead to sites offering game hacks and free currency. The document body explicitly mentions 'Free Robux Without Survey' and includes numerous URLs related to game exploits and generators. The primary malicious link is http://netcdn.tw/app/431946152/free-robux-without-survey-game-hack, which is associated with known malicious redirector infrastructure.

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/free-robux-without-survey-game-hack In PDF document text
    • http://windhorsetrek.com/userfiles/files/free-roblox-clothes-templates_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/coin-master-hack-download-ios_GM406889139.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/flip-master-free-coins_GM406889139.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/www-bandicam-com-free-robux_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/free-robux-2021_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/free-robux-glitch-2021_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/card-hack-in-coin-master_GM406889139.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/military-base-roblox-free-model_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/free-robux-gift-card-generator_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/how-to-get-free-pet-food-on-coin-master_GM406889139.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/hack-to-get-the-legendary-pet-in-adopt-me-roblox_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/minecraft-windows-10-free-code_GM479516143.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/www-coin-master_GM406889139.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/game-toolbox_GM479516143.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/robux-sites_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/coin-master-free-generator_GM406889139.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/minecraft-name-tag-hacks_GM479516143.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/roblox-free-rubox_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/free-robux-without-survey_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_off00002d6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D6B 21720 bytes
SHA-256: 1313061ee0dc2e944172e5f848c6760391f2711e79537ebba83bcd73e6c93fa9
font_01_sfnt_off00005d72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D72 19600 bytes
SHA-256: ea618dc0ac89057573f0900fc77451ab5142be89e827617cc4892c329dfdb229

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