Malicious PDF — malware analysis report

Static analysis result for SHA-256 a57db0991b04137e…

MALICIOUS

PDF

44.3 KB Created: 2021-05-17 07:11:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 6ec881eed99ea68fd3b3db14fceb111e SHA-1: 90041a67cf7655ded46e5eda6a814b819ed6baa9 SHA-256: a57db0991b04137eb3fec4d1d40a8daee7883ef7447abcba92296b081c418ea4
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 https://netcdn.xyz/app/431946152/roblox-hack-codes-game-hack PDF link annotation
    • https://bkpsdm.denpasarkota.go.id/new/public/ckfinder/userfiles/files/how-to-get-free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://bkpsdm.denpasarkota.go.id/new/public/ckfinder/userfiles/files/master-coin-free-spin-daily_GM406889139.pdfIn PDF document text
    • https://bkpsdm.denpasarkota.go.id/new/public/ckfinder/userfiles/files/coin-spin_GM406889139.pdfIn PDF document text
    • https://bkpsdm.denpasarkota.go.id/new/public/ckfinder/userfiles/files/fan-page-coin-master_GM406889139.pdfIn PDF document text
    • https://bkpsdm.denpasarkota.go.id/new/public/ckfinder/userfiles/files/today-coin-master-free-coins-link_GM406889139.pdfIn PDF document text
    • https://bkpsdm.denpasarkota.go.id/new/public/ckfinder/userfiles/files/how-to-get-free-robux-without-verification_GM431946152.pdfIn PDF document text
    • https://bkpsdm.denpasarkota.go.id/new/public/ckfinder/userfiles/files/how-do-i-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://bkpsdm.denpasarkota.go.id/new/public/ckfinder/userfiles/files/coin-master-free-gifts_GM406889139.pdfIn PDF document text
    • https://bkpsdm.denpasarkota.go.id/new/public/ckfinder/userfiles/files/coin-master-free-card-link-today_GM406889139.pdfIn PDF document text
    • https://bkpsdm.denpasarkota.go.id/new/public/ckfinder/userfiles/files/free-spins-coin-master-haktuts_GM406889139.pdfIn PDF document text
    • https://bkpsdm.denpasarkota.go.id/new/public/ckfinder/userfiles/files/june-29-coin-master-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • https://bkpsdm.denpasarkota.go.id/new/public/ckfinder/userfiles/files/coin-master-hack-tool-v1-9-download-free_GM406889139.pdfIn PDF document text
    • https://bkpsdm.denpasarkota.go.id/new/public/ckfinder/userfiles/files/coin-master-free-coins-links-2021_GM406889139.pdfIn PDF document text
    • https://bkpsdm.denpasarkota.go.id/new/public/ckfinder/userfiles/files/minecraft-dungeons-free-download_GM479516143.pdfIn PDF document text
    • https://bkpsdm.denpasarkota.go.id/new/public/ckfinder/userfiles/files/free-spin-card-exchange-coin-master_GM406889139.pdfIn PDF document text
    • https://bkpsdm.denpasarkota.go.id/new/public/ckfinder/userfiles/files/robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • https://bkpsdm.denpasarkota.go.id/new/public/ckfinder/userfiles/files/robux-page_GM431946152.pdfIn PDF document text
    • https://bkpsdm.denpasarkota.go.id/new/public/ckfinder/userfiles/files/free-spins-coin-master-app-ios_GM406889139.pdfIn PDF document text
    • https://bkpsdm.denpasarkota.go.id/new/public/ckfinder/userfiles/files/unlimited-robux-2021_GM431946152.pdfIn PDF document text
    • https://bkpsdm.denpasarkota.go.id/new/public/ckfinder/userfiles/files/how-to-hack-roblox-accounts-for-robux_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
stream_003_off00004b63.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B63 27604 bytes
SHA-256: 3e676ecbb7d428e961d168f1ec7580f93d0798adc1bf0bcfdaa193d3eee4153c
font_01_sfnt_off00008a71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A71 18356 bytes
SHA-256: 248f759c619fe1c96c576728ba71c16d7d0933fc88833f740ae7987d47f6eb68

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