Malicious PDF — malware analysis report

Static analysis result for SHA-256 de7dd0f4aca288c2…

MALICIOUS

PDF

44.7 KB Created: 2021-06-11 12:26:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: af7de621a44b8f788111ca22d6ce1d2f SHA-1: ab062000551d49ee2086361e57943ccc26d30522 SHA-256: de7dd0f4aca288c28b1158e8a4857c820eb9f349dc392e1052ecad5bf247550a
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links to external websites, many of which are hosted on domains related to 'free Robux' or 'game hacks'. The ML classifier and the PDF link farm heuristic strongly indicate malicious intent, likely to direct users to scam or phishing pages. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the content suggest a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 4

  • 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.
  • 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 https://netcdn.tw/app/431946152/hack-any-roblox-account-game-hack PDF link annotation
    • http://elibrary.uniyap.ac.id/repository/free-printable-roblox-coloring-pictures_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/fre-robux-now_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/roblox-hack-sin-verificacion-humana_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/bloxy-world-roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/los-mejores-hacks-nuevo-en-roblox-jailbreak-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/roblox-players-for-free_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/how-to-hack-admin-roblox-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/apps-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/robux-gratis-2021-hack_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/how-to-get-free-robux-without-buying-apps_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/how-to-cheat-in-roblox-find-the-doges_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/btools-hacks-roblox-2021-barbaric-gamer-oficial_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/hack-how-to-get-captain-underpants-cape-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/broken-bones-4-hack-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/how-to-get-free-diamonds-on-royale-high-roblox-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/how-to-use-hacks-on-roblox-no-virus_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/free-vip-server-jailbreak-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/roblox-avatar-clothes-free_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/join-this-group-for-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.uniyap.ac.id/repository/robux-cheaten-ohne_GM431946152.pdfIn PDF document text
    • https://Buy.HoaxMC.comIn 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_off000050e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x50E0 25760 bytes
SHA-256: a37ae73bb900521e67276daa13ac919507884af1fc8caeb282f37af5530a2fac
font_01_sfnt_off00008ac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AC1 18604 bytes
SHA-256: 0a7759155c4e248ac785acb746f218b22993ef74c333550161c4046ae57fac4e

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