Malicious PDF — malware analysis report

Static analysis result for SHA-256 c585b6eb903eeb89…

MALICIOUS

PDF

44.6 KB Created: 2021-06-04 00:26:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 061c3c4b5f2c594ebd040d73ed1a3bee SHA-1: c5124405db68fedb589c54c1cc82dba366594cd5 SHA-256: c585b6eb903eeb8942c140ec40feb2925194fbfd17b1a68d22e0eee108e24295
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 0.9865

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 https://netcdn.online/app/479516143/minecraft-hax-download-no-virus-game-hack PDF link annotation
    • http://pustaka.kebudayaan.kemdikbud.go.id/repository/coin-master-free-spins-link-today-haktuts_GM406889139.pdfIn PDF document text
    • http://pustaka.kebudayaan.kemdikbud.go.id/repository/daily-free-spins-coin-master-heaven_GM406889139.pdfIn PDF document text
    • http://pustaka.kebudayaan.kemdikbud.go.id/repository/coin-master-daily-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.kebudayaan.kemdikbud.go.id/repository/pokemon-go-free-download-hack_GM1094591345.pdfIn PDF document text
    • http://pustaka.kebudayaan.kemdikbud.go.id/repository/roblox-robux-generator_GM431946152.pdfIn PDF document text
    • http://pustaka.kebudayaan.kemdikbud.go.id/repository/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.kebudayaan.kemdikbud.go.id/repository/como-hackear-juego-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.kebudayaan.kemdikbud.go.id/repository/funbloxxyz-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.kebudayaan.kemdikbud.go.id/repository/roblox-re_GM431946152.pdfIn PDF document text
    • http://pustaka.kebudayaan.kemdikbud.go.id/repository/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.kebudayaan.kemdikbud.go.id/repository/how-to-get-free-skins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.kebudayaan.kemdikbud.go.id/repository/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.kebudayaan.kemdikbud.go.id/repository/how-do-you-hack-minecraft_GM479516143.pdfIn PDF document text
    • http://pustaka.kebudayaan.kemdikbud.go.id/repository/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • http://pustaka.kebudayaan.kemdikbud.go.id/repository/free-promo-codes-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.kebudayaan.kemdikbud.go.id/repository/coin-master-free-spins-link-no-verification-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.kebudayaan.kemdikbud.go.id/repository/free-coin-master-gifts_GM406889139.pdfIn PDF document text
    • http://pustaka.kebudayaan.kemdikbud.go.id/repository/coin-master-daily-free-spins-link-today-blog_GM406889139.pdfIn PDF document text
    • http://pustaka.kebudayaan.kemdikbud.go.id/repository/free-robux-human-verification_GM431946152.pdfIn PDF document text
    • http://pustaka.kebudayaan.kemdikbud.go.id/repository/how-to-hack-roblox-on-mobile_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000053d9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x53D9 24084 bytes
SHA-256: 7b5eccf892f522e7295738e63750f46f839db3a34281e18da7f7048ef8163f7f
font_01_sfnt_off00008a4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A4A 18772 bytes
SHA-256: c700757df4146bcd75611d33c41ed0aca4ff62925dbc333fb331944c4ea3b8c9

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