Malicious PDF — malware analysis report

Static analysis result for SHA-256 a40d68ea9515f696…

MALICIOUS

PDF

35.1 KB Created: 2021-06-28 21:46:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 2779325f10badea5a272d363020d38e7 SHA-1: 110b6539204ffff7ec7cd2570f72def7db361b43 SHA-256: a40d68ea9515f69620b1e9a218dada9376745c8a585ee5590d9739cb53a169ce
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-hacked-client-2021-game-hack PDF link annotation
    • http://lib.mappifhui.org/repository/the-free-prize-giveaway-obby-roblox_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/minecraft-pe-016-0-apk-download-free_GM479516143.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/minecraft-free-ios-2021_GM479516143.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/free-robux-hack_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/daily-free-spin-coin-master-link_GM406889139.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/robux-hack-inspect_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/how-to-get-cheat-engine-to-work-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/instant-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/www-free-robux-for-roblox_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/free-spin-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/robux-hack-download-pc_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/what-games-on-roblox-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/coin-master-game-free-spin_GM406889139.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/minecraft-hack-2021_GM479516143.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/comment-avoir-des-robus-sur-roblox-hack_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/roblox-unlimited-money-hack-jailbreak_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/how-do-you-get-free-robux-on-tablet_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/autospin-hack-roblox-pastebin_GM431946152.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/how-to-get-minecraft-for-free-on-xbox_GM479516143.pdfIn PDF document text
    • http://lib.mappifhui.org/repository/youtube-roblox-free-robux-without-downloads-legit-2021-urban420-network_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_off0000305c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x305C 22672 bytes
SHA-256: ac6f7745228ee28b5e3e3c5c058b5790abf15523fda9fbe05ff86351bf3a3f3b
font_01_sfnt_off000062ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62AD 19456 bytes
SHA-256: 2cea8ca51b1522f6e2d3c03896d838c1e083069c8202b70be1f6c6af9725b2d8

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