Malicious PDF — malware analysis report

Static analysis result for SHA-256 2854ff9f03ac55ac…

MALICIOUS

PDF

34.2 KB Created: 2021-06-29 20:42:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 380933a402411f514352ff1113386e09 SHA-1: 1239bd411a7b649aa286531c7780d7542638e469 SHA-256: 2854ff9f03ac55ac3f890cdca8f42eddea8dab7b99b06929cb3414266c099171
142 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

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.co/app/431946152/how-to-use-cheat-engine-on-roblox-2021-game-hack PDF link annotation
    • https://pn-tapaktuan.go.id/pustaka/repository/como-hackear-la-cuenta-de-alguien-en-roblox-2021_GM431946152.pdfIn PDF document text
    • https://pn-tapaktuan.go.id/pustaka/repository/minecraft-bedrock-free-download-pc_GM479516143.pdfIn PDF document text
    • https://pn-tapaktuan.go.id/pustaka/repository/wurst-115-2_GM479516143.pdfIn PDF document text
    • https://pn-tapaktuan.go.id/pustaka/repository/how-to-get-free-elite-on-roblox-murder-mystery-2_GM431946152.pdfIn PDF document text
    • https://pn-tapaktuan.go.id/pustaka/repository/free-robux-by-watching-ads_GM431946152.pdfIn PDF document text
    • https://pn-tapaktuan.go.id/pustaka/repository/roblox-adopt-me-free-vbucks_GM431946152.pdfIn PDF document text
    • https://pn-tapaktuan.go.id/pustaka/repository/free-spins-and-coins-coin-master-facebook_GM406889139.pdfIn PDF document text
    • https://pn-tapaktuan.go.id/pustaka/repository/roblox-gamepass-hack_GM431946152.pdfIn PDF document text
    • https://pn-tapaktuan.go.id/pustaka/repository/free-boombox-highschool-2-roblox_GM431946152.pdfIn PDF document text
    • https://pn-tapaktuan.go.id/pustaka/repository/best-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • https://pn-tapaktuan.go.id/pustaka/repository/free-links-to-coin-master_GM406889139.pdfIn PDF document text
    • https://pn-tapaktuan.go.id/pustaka/repository/how-to-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • https://pn-tapaktuan.go.id/pustaka/repository/minecraft-free-edition_GM479516143.pdfIn PDF document text
    • https://pn-tapaktuan.go.id/pustaka/repository/how-to-play-minion-free-tag-roblox_GM431946152.pdfIn PDF document text
    • https://pn-tapaktuan.go.id/pustaka/repository/free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://pn-tapaktuan.go.id/pustaka/repository/rbx-roblox-robux_GM431946152.pdfIn PDF document text
    • https://pn-tapaktuan.go.id/pustaka/repository/free-roblox-game-card-codes_GM431946152.pdfIn PDF document text
    • https://pn-tapaktuan.go.id/pustaka/repository/free-spins-on-coin-master-2021-ios_GM406889139.pdfIn PDF document text
    • https://pn-tapaktuan.go.id/pustaka/repository/pagina-free-robux_GM431946152.pdfIn PDF document text
    • https://pn-tapaktuan.go.id/pustaka/repository/how-to-make-a-modded-minecraft-server-for-free_GM479516143.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_off00002ebf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EBF 21988 bytes
SHA-256: 2f0ede1c94a2831b639b808b768296c63d9508401da15b1fb98cefc745e5d0a2
font_01_sfnt_off00005f51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F51 19444 bytes
SHA-256: f249b2fd61c077a483655254b40270fada98a1dac6a68d1d136664be6c5be735

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