Malicious PDF — malware analysis report

Static analysis result for SHA-256 71ed33ceb90de84e…

MALICIOUS

PDF

34.6 KB Created: 2021-07-03 14:13:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 2e5a72eb81fabd04c788fca8bd2db86e SHA-1: 6f265db1b26d76cddbf4c908754bcd4e4a8924b6 SHA-256: 71ed33ceb90de84e98f69a828e114e9fca66a69c59f4f8cc4209777482da8c57
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are related to game hacks and free in-game currency, indicating a lure for users. The heuristic findings confirm this, flagging the document as a 'free generator / game hack' redirector and a 'PDF link farm'. The ML classifier strongly supports the malicious verdict. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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 http://netcdn.tw/app/431946152/how-to-get-free-robux-2021-game-hack PDF link annotation
    • http://www.inoxograde.hr/files/how-to-hack-roblox-account-2021-new-method_GM431946152.pdfIn PDF document text
    • http://www.inoxograde.hr/files/blogspot-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.inoxograde.hr/files/robux-roblox-hack-tools_GM431946152.pdfIn PDF document text
    • http://www.inoxograde.hr/files/free-coins-on-coin-master-generator_GM406889139.pdfIn PDF document text
    • http://www.inoxograde.hr/files/coin-master-hack-to-get-free-spins_GM406889139.pdfIn PDF document text
    • http://www.inoxograde.hr/files/roblox-colouring-in-pages-free_GM431946152.pdfIn PDF document text
    • http://www.inoxograde.hr/files/easy-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.inoxograde.hr/files/how-to-duplicate-coin-master-spin-hack_GM406889139.pdfIn PDF document text
    • http://www.inoxograde.hr/files/free-100-robux_GM431946152.pdfIn PDF document text
    • http://www.inoxograde.hr/files/how-to-get-free-robux-by-playing-games-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.inoxograde.hr/files/free-tiktok-like_GM835599320.pdfIn PDF document text
    • http://www.inoxograde.hr/files/free-minecraft-games-for-kids_GM479516143.pdfIn PDF document text
    • http://www.inoxograde.hr/files/roblox-cheat-engine-admin-commands-hack_GM431946152.pdfIn PDF document text
    • http://www.inoxograde.hr/files/roblox-chat-hacks-grab-knife_GM431946152.pdfIn PDF document text
    • http://www.inoxograde.hr/files/get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.inoxograde.hr/files/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.inoxograde.hr/files/robux-place-rewards_GM431946152.pdfIn PDF document text
    • http://www.inoxograde.hr/files/roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://www.inoxograde.hr/files/roblox-how-to-get-free-clothes_GM431946152.pdfIn PDF document text
    • http://www.inoxograde.hr/files/how-to-hack-someones-roblox-account_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_off00002e36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E36 22632 bytes
SHA-256: 6bc89cd89316c8c8849665dc516930a1a9e032e0d1010b87a15db7d2268b8f07
font_01_sfnt_off000060ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60EE 19384 bytes
SHA-256: 140efaa19506918d6e23c6f72929d04436b836b18eb9dc717a4a442c24a9fe38

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