Malicious PDF — malware analysis report

Static analysis result for SHA-256 490e87af637faae8…

MALICIOUS

PDF

34.7 KB Created: 2021-06-29 16:52:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: e3a57f2938147bb2eebab3772301b3e4 SHA-1: 485d4f628a4462bcef83efbf4d56185f3fc18d2c SHA-256: 490e87af637faae84c6f0d3419c4a41d14ad642bf343aee4dbe7fa6986f2684d
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/roblox-cheat-shinobi-game-hack PDF link annotation
    • http://library.atim.ac.id/repository/roblox-ban-account-hacked_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/how-can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/how-to-hack-roblox-players-2021_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/roblox-booga-booga-hacks-no-script-needed_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/how-to-get-free-robux-fast_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/how-to-do-speed-hack-on-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/download-coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://library.atim.ac.id/repository/free-spins-coin-master-unlimited_GM406889139.pdfIn PDF document text
    • http://library.atim.ac.id/repository/how-to-hack-roblox-speed_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/roblox-i-dont-feel-so-good-simulator-hack_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/earn-free-robux-for-roblox_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/koszulki-roblox-free_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/roblox-hack-me_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/cheatotg-roblox_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/how-to-get-free-robux-games_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/how-to-get-free-robux-easy-2021_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/tiktok-free-no-sign-in_GM835599320.pdfIn PDF document text
    • http://library.atim.ac.id/repository/objet-gratuit-roblox-hack_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/coin-master-free-coins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://library.atim.ac.id/repository/free-robux-working_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_off00002f89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F89 23092 bytes
SHA-256: f5655344b56df2d6a7ab24767a70da649a17ec66253feef59c22bab4123ed72d
font_01_sfnt_off00006347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6347 18876 bytes
SHA-256: 2fd5bee26763a81e3d8ecc3cb8c6777fdbf4df1462d5abf63981406db095192e

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