Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3e9e67b1354f48d…

MALICIOUS

PDF

34.9 KB Created: 2021-06-28 14:51:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: c4726cea8e7205beaa8e7f02f3e413c8 SHA-1: bfc4c7646b0fb1e0f107aa2f545e0290a0aa0ca1 SHA-256: f3e9e67b1354f48d2966a047c7e028964f7a4eed0deb4b3672107a808efbf867
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains multiple embedded URLs, with a primary focus on 'game hack' and 'free generator' lures, impersonating brands like Facebook. The heuristic 'PDF_GAME_HACK_REDIRECT_LURE' and 'SE_BRAND_CREDENTIAL_PHISH' strongly indicate a phishing or credential harvesting attempt. The ML classifier also flagged this PDF as malicious with high confidence. No scripts were extracted, but the document's structure and embedded links suggest it is designed to trick users into visiting malicious sites, likely for credential theft or to download further malware.

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/adfly-hack-roblox-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/adfly-hack-roblox-game-hack PDF link annotation
    • http://library.itekes-bali.ac.id/repository/coinmaster-spin-ml-free_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/how-to-get-verified-on-tiktok-for-free_GM835599320.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/mcpe-master-unlimited-coins-hack-apk_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/coin-master-heaven-links-free-spins_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/pubg-uc-olx_GM1330123889.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/roblox-ro-ghoul-hack-rc_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/hack-robux-hack-hack_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/flame-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/roblox-mobile-hack_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-robux-no-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/how-to-get-free-robux-no-videos_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/all-of-the-free-roblox-clothes_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/coin-master-free-coins-and-spins-link_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-robux-generator-without-human-verification_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-robux-dont-earn_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/minecraft-pe-apk-free-download_GM479516143.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/console-free-roblox_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/good-roblox-hacks-that-can-effect-other-players_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-coins-coin-master-link_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/how-do-you-get-admin-by-hacking-roblox_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_off000030ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30EF 22636 bytes
SHA-256: 2474dd65b3c9dbf422d00122525c53f1175a1ac38bc68de706155df2dfd7232c
font_01_sfnt_off00006322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6322 19012 bytes
SHA-256: bc5e7ca926fd856ff7c452dcc9a3b89dd8cdc7508d713b5ed2d86ec0529a262d

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