Malicious PDF — malware analysis report

Static analysis result for SHA-256 19aef4dd029dd1cf…

MALICIOUS

PDF

34.7 KB Created: 2021-06-18 23:44:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: b8df58940999a5cd0017e4f5c526f94c SHA-1: dfee1982d4b5236d5ac6aed6847f4338c8e182f2 SHA-256: 19aef4dd029dd1cf164378fee4a0fba29ffac0abebb7fa6305a09dc26ba43d8a
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/murder-island-hack-roblox-script-game-hack PDF link annotation
    • http://perpus.stmik-im.ac.id/repository/how-to-get-free-robux-no-scam_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/roblox-free-catalog-items-2021_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/free-tiktok-accounts-and-passwords_GM835599320.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/coin-master-hack-tool-pc-download_GM406889139.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/coin-master-free-spins-generator_GM406889139.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/dragon-ball-ultimate-roblox-hack_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/best-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/coin-master-free-link-blogspot_GM406889139.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/how-to-get-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/how-to-get-free-robux-by-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/coin-master-free-shield-link_GM406889139.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/free-commands-for-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/robux-generator-without-human-verification_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/roblox-hack-2021-apk_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/haktuts-coin-master-today_GM406889139.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/minecraft-hacks-xbox_GM479516143.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/coin-master-real-free-spins_GM406889139.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/free-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/free-minecraft-addons_GM479516143.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/free-robux-no-gift-card_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
font_00_sfnt_off00002da2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DA2 22928 bytes
SHA-256: a3240382b0af853a1ddb6c15649b57c60b297a9c55ee1114806f1c64708f6578
font_01_sfnt_off000060ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60ED 19568 bytes
SHA-256: 3e6d31a4392be4a42b4ffde5f29273062b91ab4a7ff6042bab7b10676ad97fff

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