Malicious PDF — malware analysis report

Static analysis result for SHA-256 3df9bd56ce063520…

MALICIOUS

PDF

46.1 KB Created: 2021-06-03 13:28:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: b0573eb44d1d7f28d1bc2771e6df4a82 SHA-1: a5ee16dd56b84715c71c3ee43f83db433fc70052 SHA-256: 3df9bd56ce063520fb311c351074547f575faa94f5ee9a91e4cfc2c699443d4c
122 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. It uses a password-protected-archive lure. The file 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 0.9864

Heuristics 5

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/431946152/easy-way-to-get-free-robux-game-hack PDF link annotation
    • http://www.library.gkigadingserpong.org/repository/free-roblox-no-password_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/do-coin-master-hacks-work_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/pubg-uc-official-price_GM1330123889.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/how-to-get-free-robux-without-verification-or-surveys_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/hacked-roblox-accounts-list_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/coin-master-free-spins-app_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/blox-world-free-robux_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/coinmaster-gps-user-review-coinmaster-coin-master-hack-pagedemo-index_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/how-to-get-free-stuff-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-robux-no-password_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/coin-master-links-to-free-spins_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/coin-master-free-chip_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/unlimited-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-hack-spins-and-coins-unlimited-free-download_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/how-to-get-minecraft-windows-10-edition-for-free_GM479516143.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/how-to-hack-roblox-accounts-passwords_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/how-to-earn-robux_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-free-spin-bonus_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-free-spin-2912-2021_GM406889139.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_004_off000053e1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x53E1 26444 bytes
SHA-256: 8b7b39b709df6fd95c38565d3f774846e1fdf4da819f99aff6621c87065ef040
font_01_sfnt_off0000900d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x900D 18724 bytes
SHA-256: ff2b5f5648817baecf5754646eae61914eefadf3856a555e8e6cbc13d6b08405

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