Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ff0843721877d29…

MALICIOUS

PDF

42.8 KB Created: 2021-05-16 03:35:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 9dfecb7dd7ae8f60f3ae5c90752332d5 SHA-1: 82563c63d0e16e72883f4891d31ae8824933eec8 SHA-256: 7ff0843721877d29218e962a782251f98d252ea70e992b57cb1778037465bd84
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a high number of external links, many of which are SEO-optimized to appear as game hack generators. The primary lure is for 'Coin Master' free spins, directing users to a URL that likely hosts malicious content or further redirects. The ML classifier strongly indicated maliciousness, and the PDF structure suggests a link farm designed to attract users searching for game cheats.

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-spins-hacktman-game-hack PDF link annotation
    • https://www.gymun.cz/images/coin-master-daily-free-spin-app_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/roblox-free-skin_GM431946152.pdfIn PDF document text
    • https://www.gymun.cz/images/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • https://www.gymun.cz/images/collect-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/cute-free-hair-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.gymun.cz/images/free-800-robux_GM431946152.pdfIn PDF document text
    • https://www.gymun.cz/images/roblox-hacks-and-cheats_GM431946152.pdfIn PDF document text
    • https://www.gymun.cz/images/coin-master-game-hack-app_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/roblox-free-clothes-hack_GM431946152.pdfIn PDF document text
    • https://www.gymun.cz/images/coin-master-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • https://www.gymun.cz/images/free-roblox-hack-us_GM431946152.pdfIn PDF document text
    • https://www.gymun.cz/images/free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/free-spins-coin-master-unlimited_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/how-to-get-free-robux-without-downloading-apps-2021_GM431946152.pdfIn PDF document text
    • https://www.gymun.cz/images/how-to-get-free-roblox-gift-cards_GM431946152.pdfIn PDF document text
    • https://www.gymun.cz/images/aternos-free-minecraft-server_GM479516143.pdfIn PDF document text
    • https://www.gymun.cz/images/get-free-cards-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.gymun.cz/images/who-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.gymun.cz/images/how-to-get-more-robux-for-free_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_off00004b34.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B34 25032 bytes
SHA-256: 07c9316dff17756eb34a01ffb61c59dbbc10f8086ad8ae354ccaf100b5c03d6e
font_01_sfnt_off000084df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84DF 18316 bytes
SHA-256: 81ba624841fda991c2bdc3cb350b0e83ffc42017d6846da3044474ed4b1b677d

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