Malicious PDF — malware analysis report

Static analysis result for SHA-256 38edfc82dfae3edb…

MALICIOUS

PDF

42.9 KB Created: 2021-05-12 12:04:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: c82eed38e3b9d21454d8077e63bcc678 SHA-1: 8be39579cc127359ba242fc9629c7aa263ed151b SHA-256: 38edfc82dfae3edbf7a0f77633f2dc3aefd79954a3f5773cca639af6ed6ecdf3
142 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, 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 0.9971

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 https://netcdn.xyz/app/431946152/roblox-free-robux-com-game-hack PDF link annotation
    • https://creationegyptco.com/userfiles/files/hack-master-coin-pc_GM406889139.pdfIn PDF document text
    • https://creationegyptco.com/userfiles/files/coin-master-hack-with-lucky-patcher_GM406889139.pdfIn PDF document text
    • https://creationegyptco.com/userfiles/files/coin-master-free-spins-hack-download_GM406889139.pdfIn PDF document text
    • https://creationegyptco.com/userfiles/files/coin-master-daily-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://creationegyptco.com/userfiles/files/free-coin-master-spins-for-today_GM406889139.pdfIn PDF document text
    • https://creationegyptco.com/userfiles/files/free-coins-for-flip-master_GM406889139.pdfIn PDF document text
    • https://creationegyptco.com/userfiles/files/free-robux-groups-2021_GM431946152.pdfIn PDF document text
    • https://creationegyptco.com/userfiles/files/how-can-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://creationegyptco.com/userfiles/files/free-robux-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://creationegyptco.com/userfiles/files/hack-spin-coin-master_GM406889139.pdfIn PDF document text
    • https://creationegyptco.com/userfiles/files/androeed-ru-minecraft_GM479516143.pdfIn PDF document text
    • https://creationegyptco.com/userfiles/files/can-you-make-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://creationegyptco.com/userfiles/files/coin-master-free-spin-codes_GM406889139.pdfIn PDF document text
    • https://creationegyptco.com/userfiles/files/www-claim-gg-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • https://creationegyptco.com/userfiles/files/guide--coin-master-free-tips_GM406889139.pdfIn PDF document text
    • https://creationegyptco.com/userfiles/files/get-more-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://creationegyptco.com/userfiles/files/how-to-make-a-free-server-in-minecraft-java_GM479516143.pdfIn PDF document text
    • https://creationegyptco.com/userfiles/files/free-spins-and-coins-coin-master-app_GM406889139.pdfIn PDF document text
    • https://creationegyptco.com/userfiles/files/can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • https://creationegyptco.com/userfiles/files/how-do-you-get-roebucks_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_off00004999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4999 26640 bytes
SHA-256: cb47aa0237ea4f0f0005d7f1d9d689297cd92b23d25b3221ffc5f439e85ba53c
font_01_sfnt_off0000855b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x855B 18348 bytes
SHA-256: ea71f63ad969ac354b647f6e6da4581b14ed625e24a3109b04dcf91fda1e68c2

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