Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9ac682f51fbd232…

MALICIOUS

PDF

33.3 KB Created: 2021-07-08 21:17:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 5ce834b89cc8046dbe7d828e8d92c645 SHA-1: 83df4222cef8d345f2a9671897a68d0d148a04e3 SHA-256: d9ac682f51fbd232599b8806cfdbef4e4c30ca761622d2b1842bf9229b99683e
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.tw/app/431946152/is-roblox-free-on-pc-game-hack PDF link annotation
    • https://hotelyetihome.com/userfiles/files/free-roblox-app_GM431946152.pdfIn PDF document text
    • https://hotelyetihome.com/userfiles/files/how-to-get-minecraft-pe-for-free_GM479516143.pdfIn PDF document text
    • https://hotelyetihome.com/userfiles/files/hack-coin-master-no-verification_GM406889139.pdfIn PDF document text
    • https://hotelyetihome.com/userfiles/files/coin-master-gold-cards-free_GM406889139.pdfIn PDF document text
    • https://hotelyetihome.com/userfiles/files/hacks-to-insert-in-roblox-console_GM431946152.pdfIn PDF document text
    • https://hotelyetihome.com/userfiles/files/roblox-ip-tracker-hack_GM431946152.pdfIn PDF document text
    • https://hotelyetihome.com/userfiles/files/free-robux-2021_GM431946152.pdfIn PDF document text
    • https://hotelyetihome.com/userfiles/files/coin-master-cheat-codes-free_GM406889139.pdfIn PDF document text
    • https://hotelyetihome.com/userfiles/files/free-printable-minecraft-coloring-pages_GM479516143.pdfIn PDF document text
    • https://hotelyetihome.com/userfiles/files/20210-robux_GM431946152.pdfIn PDF document text
    • https://hotelyetihome.com/userfiles/files/roblox-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://hotelyetihome.com/userfiles/files/get-roblox-stuff-card-free_GM431946152.pdfIn PDF document text
    • https://hotelyetihome.com/userfiles/files/minecraft-tower-defense-hacked_GM479516143.pdfIn PDF document text
    • https://hotelyetihome.com/userfiles/files/roblox-booga-booga-hack-installieren-deutsch_GM431946152.pdfIn PDF document text
    • https://hotelyetihome.com/userfiles/files/coin-master-free-spin-bonus_GM406889139.pdfIn PDF document text
    • https://hotelyetihome.com/userfiles/files/coin-master-32-android-mod-hack-apk-download_GM406889139.pdfIn PDF document text
    • https://hotelyetihome.com/userfiles/files/how-to-get-free-coins-in-mcpe-master_GM406889139.pdfIn PDF document text
    • https://hotelyetihome.com/userfiles/files/minecraft-realms-free_GM479516143.pdfIn PDF document text
    • https://hotelyetihome.com/userfiles/files/free-robux-no-apps-or-surveys_GM431946152.pdfIn PDF document text
    • https://hotelyetihome.com/userfiles/files/coin-master-coins_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
font_00_sfnt_off00002dc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DC6 21768 bytes
SHA-256: 11e136cbb4d49739136fd37d567de85b70d8e7dff19fc22f020ee1e2057ce1e0
font_01_sfnt_off00005dc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DC6 18804 bytes
SHA-256: 3dd3efe1b23c7876eb0e6362499b06481da0ce89f8867ccdf7f013bd29495768

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