Malicious PDF — malware analysis report

Static analysis result for SHA-256 d62156674fc74e44…

MALICIOUS

PDF

33.8 KB Created: 2021-06-26 06:26:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 128a484991a4d0b3506320b7449f22da SHA-1: ed75d9d71624bafb11748bb3118cfd8e227c7f4a SHA-256: d62156674fc74e44bebe4823fdf76dd8c14b8a4c5dd771b19e7f09485123b82a
122 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 brand-impersonation credential phishing. The file 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

  • 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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: http://netcdn.co/app/431946152/free-robux-real-no-hack-game-hack.
  • 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/free-robux-real-no-hack-game-hack PDF link annotation
    • http://library.ulb.ac.id/repository/feburary-22-btools-hack-roblox_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/cocaine-roblox-hack_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/coin-master-cheat-codes_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/hack-robux-free-pastebin-no-subscribe_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/roblox-font-free_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-roblox-items-generator_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/cheats-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/blogger-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/blonde-hair-roblox-free_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/how-to-get-free-minecraft-alts_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/abd-roblox_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/easy-roblox-today_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-minecraft-realms-to-join_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/free-robux-promo-codes-october-2021_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/case-clicker-cheats-roblox-2021_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/minecraft-free-no-download_GM479516143.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/make-free-robux_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id//repository/watch-ads-for-robux_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/synlapse-roblox-free-download_GM431946152.pdfIn PDF document text
    • http://library.ulb.ac.id/repository/facebook-coin-master_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_off00002d56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D56 22320 bytes
SHA-256: b802eee75f08f3ee95dec71f8baa306d1d5618be25e793126c066a758536c7e2
font_01_sfnt_off00005f45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F45 18960 bytes
SHA-256: 3fdb6384b414e6bed4f7c2d63d1ef93c27408a4bf8cac021bf2266af238b1afd

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