Malicious PDF — malware analysis report

Static analysis result for SHA-256 1db5b5e2c187a165…

MALICIOUS

PDF

33.6 KB Created: 2021-06-28 04:14:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 5996edcdd284cd48ecc12968307ca304 SHA-1: d3981f02b289f796fac2134a10b5cc6cf12d2c5f SHA-256: 1db5b5e2c187a165c667a2acbdc2b0bcf620a231cf0be1ecbece335ef50555ca
182 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. It uses a password-protected-archive lure. 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 6

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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-galleons-hack-game-hack PDF link annotation
    • http://library.ulb.ac.id/repository/roblox-jailbreak-noclip-cheat-engine_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/coin-master-jackpot-hack_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-robux-without-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/free-coin-master-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-spins-coin-master-links-2021_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-spin-coin-master-new-link_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-robux-with-no-survey_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/coin-master-hack-download-apk_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/roblox-hack-no-survey-no-password-no-download_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/roblox-jailbreak-cash-hack_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-tiktok-followers-without-human-verification-2021_GM835599320.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/how-to-get-minecraft-for-free-on-mac_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-hack-using-insert-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-bandana-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/roblox-hack-gui-script-pastebin_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/roblox-adonis-admin-hack_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/roblox-com-free-stuff_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-get-robux-for-free-on-a-comuter_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/rbx-free-robux_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_off00002d32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D32 22436 bytes
SHA-256: 5587b1b2787e78f1b01dbae24c300e4ef319efb9a17c0d02f3829b26b4f7e3e7
font_01_sfnt_off00005f2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F2C 18656 bytes
SHA-256: b123ef7693739aa56357af6f3b73c079e51fb3b3c4834976ed5064be467956e0

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