Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1b94f3e67dd2ef6…

MALICIOUS

PDF

44.7 KB Created: 2021-06-09 07:08:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: ca46839ae27fd2849affb4757aff5399 SHA-1: 22594d6589782827756b3958544f3e9c51909f5f SHA-256: a1b94f3e67dd2ef680340a00c8deb9f3d88e877f46b59d115040aa7753e9236f
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. 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 0.9865

Heuristics 4

  • 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.tw/app/431946152/best-free-roblox-items-game-hack PDF link annotation
    • http://www.smkrekayasa-dps.sch.id/new/public/ckfinder/userfiles/files/minecraft-free-minecraft_GM479516143.pdfIn PDF document text
    • http://www.smkrekayasa-dps.sch.id/new/public/ckfinder/userfiles/files/where-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.smkrekayasa-dps.sch.id/new/public/ckfinder/userfiles/files/free-spins-and-coins-from-coin-master-game_GM406889139.pdfIn PDF document text
    • http://www.smkrekayasa-dps.sch.id/new/public/ckfinder/userfiles/files/roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://www.smkrekayasa-dps.sch.id/new/public/ckfinder/userfiles/files/how-to-get-free-spins-on-coin-master-2021-links_GM406889139.pdfIn PDF document text
    • http://www.smkrekayasa-dps.sch.id/new/public/ckfinder/userfiles/files/more-robux_GM431946152.pdfIn PDF document text
    • http://www.smkrekayasa-dps.sch.id/new/public/ckfinder/userfiles/files/minecraft-hacked-client-bedrock_GM479516143.pdfIn PDF document text
    • http://www.smkrekayasa-dps.sch.id/new/public/ckfinder/userfiles/files/coin-master-15-free-spin-link-of-last-5-days_GM406889139.pdfIn PDF document text
    • http://www.smkrekayasa-dps.sch.id/new/public/ckfinder/userfiles/files/google-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.smkrekayasa-dps.sch.id/new/public/ckfinder/userfiles/files/free-roblox-clothes_GM431946152.pdfIn PDF document text
    • http://www.smkrekayasa-dps.sch.id/new/public/ckfinder/userfiles/files/cheats-for-getting-robux_GM431946152.pdfIn PDF document text
    • http://www.smkrekayasa-dps.sch.id/new/public/ckfinder/userfiles/files/coin-master-unlimited-spin-hack-mod-apk_GM406889139.pdfIn PDF document text
    • http://www.smkrekayasa-dps.sch.id/new/public/ckfinder/userfiles/files/roblox-hack-generator_GM431946152.pdfIn PDF document text
    • http://www.smkrekayasa-dps.sch.id/new/public/ckfinder/userfiles/files/how-to-hack-in-arsenal_GM431946152.pdfIn PDF document text
    • http://www.smkrekayasa-dps.sch.id/new/public/ckfinder/userfiles/files/coin-master-daily-free-spins_GM406889139.pdfIn PDF document text
    • http://www.smkrekayasa-dps.sch.id/new/public/ckfinder/userfiles/files/bux-life-free-robux_GM431946152.pdfIn PDF document text
    • http://www.smkrekayasa-dps.sch.id/new/public/ckfinder/userfiles/files/roblox-login-hack_GM431946152.pdfIn PDF document text
    • http://www.smkrekayasa-dps.sch.id/new/public/ckfinder/userfiles/files/free-robux-mod_GM431946152.pdfIn PDF document text
    • http://www.smkrekayasa-dps.sch.id/new/public/ckfinder/userfiles/files/minecraft-images-free_GM479516143.pdfIn PDF document text
    • http://www.smkrekayasa-dps.sch.id/new/public/ckfinder/userfiles/files/free-roblox-accounts-with-robux-that-work-2021_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_004_off0000525f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x525F 24868 bytes
SHA-256: f3a7ceb9710f4bf0f27b7273d5118d530ec22a037a3e36ad7623de0e580983cd
font_01_sfnt_off00008c0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C0E 18312 bytes
SHA-256: a5662c79a0401749e14234f4b416297098739e1b64a8d77c926f91b847e60d97

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