Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6801b1e3845e236…

MALICIOUS

PDF

44.6 KB Created: 2021-05-16 11:45:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: cbc0246b1a91027cf9b692c92c2deb7a SHA-1: 684a4805c9fb431383b663dbef1ded7d63f3cf67 SHA-256: b6801b1e3845e23680199aeed9084414767b451bd7cf3676a743e6d98d8f698c
142 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many of which point to websites offering game hacks and generators. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass external link farm, suggesting a tactic to drive traffic to potentially malicious or scam-related content. The ML classifier also flagged this PDF as malicious with high confidence. The primary attack pattern appears to be luring users to external sites through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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/479516143/can-you-host-a-minecraft-server-for-free-game-hack PDF link annotation
    • http://i-koinoxrista.gr/images/coin-master-hack-xyz_GM406889139.pdfIn PDF document text
    • http://i-koinoxrista.gr/images/free-spin-coin-master-apk_GM406889139.pdfIn PDF document text
    • http://i-koinoxrista.gr/images/free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://i-koinoxrista.gr/images/coin-master-apk-hack-2021-ios_GM406889139.pdfIn PDF document text
    • http://i-koinoxrista.gr/images/hack-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://i-koinoxrista.gr/images/coin-master-game-2021-free-spin-link_GM406889139.pdfIn PDF document text
    • http://i-koinoxrista.gr/images/free-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://i-koinoxrista.gr/images/where-can-i-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://i-koinoxrista.gr/images/free-robux-no-human-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://i-koinoxrista.gr/images/coin-master-hack-mod-game-download_GM406889139.pdfIn PDF document text
    • http://i-koinoxrista.gr/images/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://i-koinoxrista.gr/images/what-is-a-minecraft-client_GM479516143.pdfIn PDF document text
    • http://i-koinoxrista.gr/images/free-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • http://i-koinoxrista.gr/images/coin-master-hack-mod-apk-android-1_GM406889139.pdfIn PDF document text
    • http://i-koinoxrista.gr/images/what-games-on-roblox-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://i-koinoxrista.gr/images/how-to-get-free-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://i-koinoxrista.gr/images/how-to-get-free-robux-for-real_GM431946152.pdfIn PDF document text
    • http://i-koinoxrista.gr/images/roblox-download_GM431946152.pdfIn PDF document text
    • http://i-koinoxrista.gr/images/can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://i-koinoxrista.gr/images/minecraft-windows-10-free-with-java_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004886.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4886 26356 bytes
SHA-256: b5ea76b32b22339e1ea824b19f06080c0615d5bb722af8ab19aaaf7f6db19d3e
font_01_sfnt_off00008257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8257 2940 bytes
SHA-256: eb230542719c96b42e3fd8bb01e35f13ebd5f02629049da3a58e7fd7607bf48a
font_02_sfnt_off00008c66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C66 18124 bytes
SHA-256: 8e5dc60291529a08b56c91f5b02c83709fd9076ee9043487047b9c72fda07db8

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