Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dc351c78cf56375…

MALICIOUS

PDF

33.8 KB Created: 2021-07-03 13:36:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 42141f454fee5d0810521b096c4bf69d SHA-1: 51711e808382f5d866f38b79c0a2e11d6cd3940b SHA-256: 9dc351c78cf56375d4117e1bc3e4248a3d0a4a36986038485adac0e43835ee2e
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document employs a lure related to game hacks and free virtual currency to entice users. It contains a high number of external links, many pointing to other PDFs hosted on similar domains, suggesting a link farm or SEO manipulation tactic. The primary URL http://netcdn.tw/app/431946152/roblox-promo-codes-for-free-robux-game-hack is a key indicator of the malicious intent.

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/roblox-promo-codes-for-free-robux-game-hack PDF link annotation
    • http://perpustakaan.pa-jember.go.id/repository/hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pa-jember.go.id/repository/facebook-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://perpustakaan.pa-jember.go.id/repository/how-to-get-free-robux-by-doing-surveys_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pa-jember.go.id/repository/born-to-hack-roblox-group-logo_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pa-jember.go.id/repository/mcpe-master-coin-hack-apk_GM406889139.pdfIn PDF document text
    • http://perpustakaan.pa-jember.go.id/repository/comandos-para-free-admin-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pa-jember.go.id/repository/sendspace-cheat-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pa-jember.go.id/repository/hack-para-roblox-de-romper-pardedes_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pa-jember.go.id/repository/code-free-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pa-jember.go.id/repository/how-to-get-free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pa-jember.go.id/repository/how-do-you-hack-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pa-jember.go.id/repository/i-will-hack-and-not-kill-parent-roblox-group_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pa-jember.go.id/repository/roblox-polo-ralph-lauren-free-shirt_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pa-jember.go.id/repository/minecraft-redeem-code-free_GM479516143.pdfIn PDF document text
    • http://perpustakaan.pa-jember.go.id/repository/cm-spins_GM406889139.pdfIn PDF document text
    • http://perpustakaan.pa-jember.go.id/repository/minecraft-hack-client-download_GM479516143.pdfIn PDF document text
    • http://perpustakaan.pa-jember.go.id/repository/how-do-you-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pa-jember.go.id/repository/free-roblox-girl-clothes_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pa-jember.go.id/repository/create-a-roblox-account-free-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pa-jember.go.id/repository/roblox-free-downloadf_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_off00002de9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DE9 21956 bytes
SHA-256: e9bcc5690e763f9cda2bfc63bf7c2ffefa70b42305f74faf52d04c3b8fd28c55
font_01_sfnt_off00005e37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E37 19380 bytes
SHA-256: f599988ad614928277529a5070f43d57f30efd84bc389ab6e612c4c8b358aa39

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