Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc0fad21b658840a…

MALICIOUS

PDF

34.6 KB Created: 2021-07-09 02:19:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 38e91ecd55888efcfb4415d2abc0731f SHA-1: e4d10caa274ad4b0194713981df97d68c05e7ccd SHA-256: dc0fad21b658840a9a3d9e01aad39d23f77f32b0e896c7cc3cf8f8991cbe4e6f
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. 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 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/406889139/how-to-get-free-coins-in-coin-master-game-hack PDF link annotation
    • https://www.furtherstudies.my/uploaded_files/userfiles/files/app-free-robux-pc_GM431946152.pdfIn PDF document text
    • https://www.furtherstudies.my/uploaded_files/userfiles/files/what-is-e-free-in-roblox_GM431946152.pdfIn PDF document text
    • https://www.furtherstudies.my/uploaded_files/userfiles/files/roblox-highschool-how-to-get-free-gear_GM431946152.pdfIn PDF document text
    • https://www.furtherstudies.my/uploaded_files/userfiles/files/roblox-hack-bad-behaviour_GM431946152.pdfIn PDF document text
    • https://www.furtherstudies.my/uploaded_files/userfiles/files/how-can-i-free-robux-on-roblox-games_GM431946152.pdfIn PDF document text
    • https://www.furtherstudies.my/uploaded_files/userfiles/files/coin-master-apk_GM406889139.pdfIn PDF document text
    • https://www.furtherstudies.my/uploaded_files/userfiles/files/hacking-for-account-roblox_GM431946152.pdfIn PDF document text
    • https://www.furtherstudies.my/uploaded_files/userfiles/files/free-robux-generator-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://www.furtherstudies.my/uploaded_files/userfiles/files/hack-server-vip-roblox_GM431946152.pdfIn PDF document text
    • https://www.furtherstudies.my/uploaded_files/userfiles/files/free-robux-without-human-verification-2021-or-survey_GM431946152.pdfIn PDF document text
    • https://www.furtherstudies.my/uploaded_files/userfiles/files/how-to-get-stuff-that-cost-coins-free-mpe-master_GM406889139.pdfIn PDF document text
    • https://www.furtherstudies.my/uploaded_files/userfiles/files/free-robux-generator-no-survey-mac_GM431946152.pdfIn PDF document text
    • https://www.furtherstudies.my/uploaded_files/userfiles/files/cheat-engine-robux-adress_GM431946152.pdfIn PDF document text
    • https://www.furtherstudies.my/uploaded_files/userfiles/files/free-stuff-in-roblox-catalog-2021_GM431946152.pdfIn PDF document text
    • https://www.furtherstudies.my/uploaded_files/userfiles/files/claim-free-robux-now_GM431946152.pdfIn PDF document text
    • https://www.furtherstudies.my/uploaded_files/userfiles/files/free-minecraft-skins-java_GM479516143.pdfIn PDF document text
    • https://www.furtherstudies.my/uploaded_files/userfiles/files/games-that-give-free-robux_GM431946152.pdfIn PDF document text
    • https://www.furtherstudies.my/uploaded_files/userfiles/files/free-robux-2021-working_GM431946152.pdfIn PDF document text
    • https://www.furtherstudies.my/uploaded_files/userfiles/files/how-to-get-free-robux-2-15-2021_GM431946152.pdfIn PDF document text
    • https://www.furtherstudies.my/uploaded_files/userfiles/files/pastebin-free-robux-hack-2021_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_002_off0000319d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x319D 22992 bytes
SHA-256: f4bd4f340aa11d5c0e257499cd385adfea7c1d94fdf88be6dd6550aba7710c34
font_01_sfnt_off000064f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64F4 18164 bytes
SHA-256: 9fab875a536b983537b9433768b1ea3e5c55ad95c87001a66781b974c182b662

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