Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc63b71ddb7d8ac3…

MALICIOUS

PDF

44.4 KB Created: 2021-06-10 15:07:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 11d3a013f9a8af7ea1634633a590ede4 SHA-1: 39be8516bdc908ff234bce079c30a6b917d49c73 SHA-256: cc63b71ddb7d8ac3b527bc8de6a182f7ec06c27d9164fb1ec97a464b7f846429
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF document contains a lure impersonating Microsoft, promising free Robux and directing users to a link that displays a fake CAPTCHA. This is a common tactic to trick users into clicking malicious links, likely leading to credential harvesting or the download of a second-stage payload. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 6

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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: https://netcdn.tw/app/431946152/how-to-claim-free-robux-games-real-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 https://netcdn.tw/app/431946152/how-to-claim-free-robux-games-real-game-hack PDF link annotation
    • https://akbidprimahusada.ac.id/elibrary/repository/free-robux-codes-2021-pastebin_GM431946152.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary/repository/microsoft-robux_GM431946152.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary/repository/free-coin-spin-daily-link-coin-master_GM406889139.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary/repository/make-robux_GM431946152.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary//repository/coin-master-hacks-free-spins_GM406889139.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary//repository/roblox-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary//repository/free-robux-games-on-roblox_GM431946152.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary/repository/roblox-game-cheats_GM431946152.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary/repository/coin-master-35-16-hack-apk_GM406889139.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary/repository/coin-master-facebook-hack_GM406889139.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary/repository/free-shirt-roblox_GM431946152.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary//repository/coin-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • https://akbidprimahusada.ac.id/elibrary/repository/pastebincom-roblox-robux-hack_GM431946152.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary//repository/real-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary//repository/minecraft-hacked-client-download_GM479516143.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary//repository/how-to-get-free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary/repository/coin-and-spin-link_GM406889139.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary/repository/coin-master-free-spins-2021-link_GM406889139.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary//repository/haktuts-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary//repository/how-much-robux-can-you-get-with-1-million-dollars_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
stream_004_off00004ea4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4EA4 25856 bytes
SHA-256: c4e2336198b96aee7663b0556ec41c84bf6f11f2901a1cd45862b71b3c2ce306
font_01_sfnt_off0000894c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x894C 18860 bytes
SHA-256: 42562c1587d67a559e808dc16e8af920160d31000263b0f50743d93e456816f1

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