Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5f43cd9177fce8d…

MALICIOUS

PDF

34.7 KB Created: 2021-07-06 17:23:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: ffe583a664712406701e2ab1d97dcc85 SHA-1: 0cc9ee8d3e1cf915898687efe25df0cf9d486f94 SHA-256: c5f43cd9177fce8dacc6f0d24a484e0ff3ccdd19bff70202b40c705c58c1ec28
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document uses a lure related to 'free Robux' and 'game hacks' to entice users. It contains an embedded URL, http://netcdn.tw/app/431946152/free-robux-without-survey-game-hack, which is flagged as a redirector and associated with malicious activity. The ML classifier strongly indicates maliciousness, and the overall pattern suggests a phishing or scam attempt designed to lead users to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.tw/app/431946152/free-robux-without-survey-game-hack PDF link annotation
    • https://library.uigm.ac.id/repository/coin-master-app-for-free-spins_GM406889139.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/free-robux-promo-code-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/free-robux-reedem-game_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/roblox-bio-hack_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/how-to-get-robux-on-roblox-free-2021_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/how-to-hack-into-someones-roblox-account_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/can-you-buy-roblox-accountsu-get-alone-for-free-roblox_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/roblox-community-free-robux_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/roblox-how-to-sell-items-for-free_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/how-to-get-free-robux-easy-2021_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/roblox-xbox360-download-free_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/freer-pro-tiktok_GM835599320.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/free-robux-get-now_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/roblox-cheats-mac_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/instagram-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/roblox-free-hack-robux-2021_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/pubg-uc-generator-without-verification_GM1330123889.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/roblox-how-to-make-ur-self-look-good-for-free_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/how-to-change-your-username-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/free-robux-generatorf_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_off00002fac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FAC 22196 bytes
SHA-256: cdfa77d995471a08dfa8ddbf0c21879332745e95fe4fdff29d5b25d5020ec864
font_01_sfnt_off000060ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60ED 19600 bytes
SHA-256: ea618dc0ac89057573f0900fc77451ab5142be89e827617cc4892c329dfdb229

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