Malicious PDF — malware analysis report

Static analysis result for SHA-256 4130ead2e5842096…

MALICIOUS

PDF

15.6 KB Created: 2021-07-06 16:08:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 9421da2cc416c59e509f00601b803880 SHA-1: d371c30ebc31163b12002f56a71a75720573ac68 SHA-256: 4130ead2e5842096bbe4023a2e1754cb1736512053fcdbaf264971f713771a57
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that lead to a known malicious redirector infrastructure, specifically advertising 'free Robux generator' and 'game hacks'. The primary lure URL is http://netcdn.tw/app/431946152/free-robux-generator-no-human-verification-2021-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a social engineering attack aimed at tricking users into visiting malicious sites, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 3

  • 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.
  • 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-generator-no-human-verification-2021-game-hack In PDF document text
    • http://www.ma-plast.hr/files/free-robux-hacks-no-verification_GM431946152.pdfIn PDF document text
    • http://www.ma-plast.hr/files/roblox-free-clothes-codes_GM431946152.pdfIn PDF document text
    • https://www.ma-plast.hr/files/free-robux-mobile_GM431946152.pdfIn PDF document text
    • http://www.ma-plast.hr/files/moon-tycoon-roblox-gives-free-robux_GM431946152.pdfIn PDF document text
    • https://www.ma-plast.hr/files/rosie-hacks-caillous-roblox-account_GM431946152.pdfIn PDF document text
    • http://www.ma-plast.hr/files/free-rare-cards-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.ma-plast.hr/files/pubg-uc-voucher-redeem_GM1330123889.pdfIn PDF document text
    • https://www.ma-plast.hr/files/free-games-like-minecraft_GM479516143.pdfIn PDF document text
    • https://www.ma-plast.hr/files/free-stuff-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.ma-plast.hr/files/robux-hack_GM431946152.pdfIn PDF document text
    • http://www.ma-plast.hr/files/free-spin-codes-coin-master_GM406889139.pdfIn PDF document text
    • http://www.ma-plast.hr/files/how-to-buy-anything-from-roblox-c-atalog-for-free_GM431946152.pdfIn PDF document text
    • https://www.ma-plast.hr/files/cr7-test-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.ma-plast.hr/files/free-coin-master-gold-cards_GM406889139.pdfIn PDF document text
    • https://www.ma-plast.hr/files/can-i-get-robux-for-free_GM431946152.pdfIn PDF document text
    • https://www.ma-plast.hr/files/shark-hacks-roblox_GM431946152.pdfIn PDF document text
    • http://www.ma-plast.hr/files/strawberry-roblox-cheat_GM431946152.pdfIn PDF document text
    • http://www.ma-plast.hr/files/how-to-hack-in-roblox-prison-life_GM431946152.pdfIn PDF document text
    • https://www.ma-plast.hr/files/open-coin-master_GM406889139.pdfIn PDF document text
    • http://www.ma-plast.hr/files/free-robux-farm_GM431946152.pdfIn PDF document text