Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ec639fa7d502118…

MALICIOUS

PDF

42.4 KB Created: 2021-05-14 17:17:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 403a49abea7a0fc49c17aa9b48f64dd1 SHA-1: f10512df1907a446b0009fdc4ca0e03c4841f89f SHA-256: 3ec639fa7d5021180d9cd620e28e5cf52148ee9d637db6d8206f327bd83189d3
142 Risk Score

Malware Insights

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

This PDF document contains numerous links, identified as a link farm, that redirect to websites offering game hacks and free currency. The primary lure appears to be related to 'Robux' and 'Coin Master' exploits. The document's structure and embedded links suggest an attempt to drive traffic to potentially malicious sites, likely for phishing or malware distribution.

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/google-how-do-you-get-robux-game-hack PDF link annotation
    • https://www.gymun.cz/images/free-spins-coin-master-unlimited_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/how-to-make-a-minecraft-pe-server-for-free_GM479516143.pdfIn PDF document text
    • https://www.gymun.cz/images/minecraft-items_GM479516143.pdfIn PDF document text
    • https://www.gymun.cz/images/free-robux-generator-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://www.gymun.cz/images/coin-master-daily-free-spin-app_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/free-spin-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/hack-coin-master-online-without-human-verification_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/haktuts-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/free-robux-just-enter-username_GM431946152.pdfIn PDF document text
    • https://www.gymun.cz/images/coin-master-hack-tool-generator_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • https://www.gymun.cz/images/free-roblox-hair-boy_GM431946152.pdfIn PDF document text
    • https://www.gymun.cz/images/coin-master-daily-free-spins-25_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/show-me-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.gymun.cz/images/where-can-i-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/how-to-get-minecraft-for-free-on-iphone-2021_GM479516143.pdfIn PDF document text
    • https://www.gymun.cz/images/coin-master-free-spins-whatsapp-link_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/free-robux-without-verify_GM431946152.pdfIn PDF document text
    • https://www.gymun.cz/images/how-to-get-free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • https://www.gymun.cz/images/robuxmatch-com-free-robux_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_003_off000048dd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48DD 24548 bytes
SHA-256: 6038e7961a940fdea8a784dde4dd3c87824bd7c818f6c5b9b1afb3723e72e453
font_01_sfnt_off0000817d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x817D 18812 bytes
SHA-256: feb1a9118afec68bc04581c8785d3317eaa63f31aad7b08e8712898c0d5a9a77

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