Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b86b7cad90aa012…

MALICIOUS

PDF

33.7 KB Created: 2021-07-01 05:13:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 79cd930ee5e62e341fc373d50e183a5d SHA-1: 805fe359e5ef1adb4f579d8ecf66e65d8884ea53 SHA-256: 7b86b7cad90aa012ccd78e24f41ccafa49478a1672585d5da831587d7a82c115
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a known malicious redirector infrastructure, disguised as offers for free game currency or hacks. The primary lure URL is http://netcdn.co/app/431946152/free-robux-on-ipad-game-hack. This suggests the document is designed to trick users into visiting malicious sites, likely for credential harvesting or further malware delivery.

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.co/app/431946152/free-robux-on-ipad-game-hack In PDF document text
    • https://xhse.vn/public/upload/files/how-to-make-a-free-model-on-roblox_GM431946152.pdfIn PDF document text
    • https://xhse.vn/public/upload/files/jj-hacks-roblox_GM431946152.pdfIn PDF document text
    • https://xhse.vn/public/upload/files/roblox-money-hack-jailbreak-download_GM431946152.pdfIn PDF document text
    • https://xhse.vn/public/upload/files/i-love-free-robux_GM431946152.pdfIn PDF document text
    • https://xhse.vn/public/upload/files/roblox-hack-account-bugmenot-wiki_GM431946152.pdfIn PDF document text
    • https://xhse.vn/public/upload/files/earn-free-robux_GM431946152.pdfIn PDF document text
    • https://xhse.vn/public/upload/files/coin-master-free-spins-hack-link_GM406889139.pdfIn PDF document text
    • https://xhse.vn/public/upload/files/robux-hacks-2021_GM431946152.pdfIn PDF document text
    • https://xhse.vn/public/upload/files/how-to-get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://xhse.vn/public/upload/files/coin-master-hack-apk-ios-download_GM406889139.pdfIn PDF document text
    • https://xhse.vn/public/upload/files/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • https://xhse.vn/public/upload/files/totally-free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • https://xhse.vn/public/upload/files/roblox-hack-apk-robux_GM431946152.pdfIn PDF document text
    • https://xhse.vn/public/upload/files/roblox-mods-free_GM431946152.pdfIn PDF document text
    • https://xhse.vn/public/upload/files/to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://xhse.vn/public/upload/files/how-to-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • https://xhse.vn/public/upload/files/roblox-army-robux_GM431946152.pdfIn PDF document text
    • https://xhse.vn/public/upload/files/orewards-com-free-robux_GM431946152.pdfIn PDF document text
    • https://xhse.vn/public/upload/files/coin-master-15-free-spin-link-of-last-5-days_GM406889139.pdfIn PDF document text
    • https://xhse.vn/public/upload/files/free-robux-fast-ponits_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_off00002d82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D82 22060 bytes
SHA-256: d12fb12cadcadaef815b543348d9e35207c79de810aba7170d7b3b82a1bdd1f9
font_01_sfnt_off00005e61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E61 19068 bytes
SHA-256: 67e53c85bca0a69857880cc13847ac6002be1334b1a281a29b6a7cf4a4c37e3d