Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bddb4638f254cc0…

MALICIOUS

PDF

42.6 KB Created: 2021-05-16 13:42:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: e21acf648ad4e562f59473bf599f6c61 SHA-1: 29d4be46e69827d6afc3600feb25afb5dd4eb6d1 SHA-256: 4bddb4638f254cc099ef77bdf333f5c08a500a5b9ea0cf75d32e40c7ed752fd2
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/406889139/coin-master-free-coin-and-spin-app-game-hack PDF link annotation
    • https://www.sitiwebjoomla.it/images/free-coins-on-coin-master-without-verification_GM406889139.pdfIn PDF document text
    • https://www.sitiwebjoomla.it/images/play-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • https://www.sitiwebjoomla.it/images/coin-master-daily-free-rewards_GM406889139.pdfIn PDF document text
    • https://www.sitiwebjoomla.it/images/coin-master-free-link-daily_GM406889139.pdfIn PDF document text
    • https://www.sitiwebjoomla.it/images/how-to-get-free-mods-in-minecraft_GM479516143.pdfIn PDF document text
    • https://www.sitiwebjoomla.it/images/coin-master-free-spins-hack-without-human-verification_GM406889139.pdfIn PDF document text
    • https://www.sitiwebjoomla.it/images/free-gfx-roblox_GM431946152.pdfIn PDF document text
    • https://www.sitiwebjoomla.it/images/free-robux-games-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.sitiwebjoomla.it/images/coin-master-free-spins-link-facebook_GM406889139.pdfIn PDF document text
    • https://www.sitiwebjoomla.it/images/robux-fun-hack_GM431946152.pdfIn PDF document text
    • https://www.sitiwebjoomla.it/images/how-to-make-free-robux_GM431946152.pdfIn PDF document text
    • https://www.sitiwebjoomla.it/images/coin-master-free-spinv1-0apkpure-com-apk_GM406889139.pdfIn PDF document text
    • https://www.sitiwebjoomla.it/images/toolbox-for-minecraft-ios_GM479516143.pdfIn PDF document text
    • https://www.sitiwebjoomla.it/images/coin-master-daily-free-spins_GM406889139.pdfIn PDF document text
    • https://www.sitiwebjoomla.it/images/free-spins-for-coin-master-app_GM406889139.pdfIn PDF document text
    • https://www.sitiwebjoomla.it/images/hey-google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.sitiwebjoomla.it/images/what-games-give-you-robux_GM431946152.pdfIn PDF document text
    • https://www.sitiwebjoomla.it/images/robux-hack-generator_GM431946152.pdfIn PDF document text
    • https://www.sitiwebjoomla.it/images/coin-master-daily-free-spins-and-coins-link_GM406889139.pdfIn PDF document text
    • https://www.sitiwebjoomla.it/images/free-spin-link-for-coin-master_GM406889139.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_003_off00004b52.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B52 25384 bytes
SHA-256: 2b5f80e2501317bbd9cf5e448019d943f2e15f027dd2face887abc12d53c0581
font_01_sfnt_off000084ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84AB 18060 bytes
SHA-256: f77ee24e01944806ea28e16fd73427a54f7109e241804df06ce657d8c6d11cfb

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