Malicious PDF — malware analysis report

Static analysis result for SHA-256 815b77b233e6bbc3…

MALICIOUS

PDF

34.8 KB Created: 2021-07-04 03:19:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: df8595ccd41dde1bc2c0613867f73b7e SHA-1: 1b0ba36a3e1a11106bf4906527c94b7afc0b3067 SHA-256: 815b77b233e6bbc3c68f4d0fc4b18959fa660d99c099b5e13d6cc0e87e0d04aa
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple external links, including one pointing to a 'game hack' lure. The heuristic 'PDF_SEO_LINK_FARM' indicates the presence of a large number of external PDF links, suggesting a link farm or SEO manipulation tactic. The document's content and structure strongly suggest it is designed to redirect users to potentially malicious websites, likely for advertising or further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/get-free-coins-on-coin-master-game-hack PDF link annotation
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/free-minecraft-java-edition_GM479516143.pdfIn PDF document text
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/how-to-hack-project-pokemon-roblox_GM431946152.pdfIn PDF document text
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/coin-master-mod-apk-unlimited-spin-download-free-full-version_GM406889139.pdfIn PDF document text
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/free-robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/avatar-the-last-airbender-roblox_GM431946152.pdfIn PDF document text
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/coin-master-claim-spins_GM406889139.pdfIn PDF document text
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/coin-master-app-for-free-spins_GM406889139.pdfIn PDF document text
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/free-coin-master-spin-app_GM406889139.pdfIn PDF document text
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/how-to-hack-the-plaza-roblox_GM431946152.pdfIn PDF document text
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/how-to-hack-games-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/free-roblox-songs-music_GM431946152.pdfIn PDF document text
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/free-robux-list_GM431946152.pdfIn PDF document text
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/how-to-hack-free-robux-on-ipad_GM431946152.pdfIn PDF document text
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/how-to-get-minecraft-for-free-on-android_GM479516143.pdfIn PDF document text
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/hackear-coin-master_GM406889139.pdfIn PDF document text
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/free-robux-hack-glitch_GM431946152.pdfIn PDF document text
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/coin-master-free-spins-no-survey_GM406889139.pdfIn PDF document text
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/how-to-hack-a-persons-in-roblox_GM431946152.pdfIn PDF document text
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/roblox-hack-com_GM431946152.pdfIn PDF document text
    • http://www.vkinstitute.co.in/uploaded_files/userfiles/files/minecraft-bedrock-for-free_GM479516143.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_off00003282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3282 23104 bytes
SHA-256: 77f143376bb5b9eb9041d9d66bafb65c7f976fedf1d8af6f3efabdb2f9a8605b
font_01_sfnt_off0000666d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x666D 17996 bytes
SHA-256: 84abfb78fff46ba9d1cedccb39989fd511fb56f98da01a72a76aef3ac1dd5f54

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