Malicious PDF — malware analysis report

Static analysis result for SHA-256 41a9aa16c49ccb10…

MALICIOUS

PDF

37.3 KB Created: 2021-07-04 02:33:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 1c15de7e962d042f5f89eedffe377fbc SHA-1: 87f5edafeede0c90b5d67800d7133d1dd201dbf5 SHA-256: 41a9aa16c49ccb1043048ba981107145d3180809530e91fafd4f685858d22e34
142 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are SEO-optimized pages offering game hacks and cheats for popular games like Coin Master and Roblox. The primary link directs to a page titled 'coin-master-32-mod-hack-unlimited-game-hack', indicating a lure for users seeking unauthorized game modifications. This pattern suggests a phishing or scam attempt to drive traffic to potentially malicious or ad-filled sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/coin-master-32-mod-hack-unlimited-game-hack PDF link annotation
    • https://ezgolfer.com.tw/image/data/files/how-to-get-free-coins-in-coin-master-game_GM406889139.pdfIn PDF document text
    • https://ezgolfer.com.tw/image/data/files/how-to-get-free-robux-on-a-website_GM431946152.pdfIn PDF document text
    • https://ezgolfer.com.tw/image/data/files/pubg-uc-new-freepik_GM1330123889.pdfIn PDF document text
    • https://ezgolfer.com.tw/image/data/files/free-robux-inspect-tool-needed_GM431946152.pdfIn PDF document text
    • https://ezgolfer.com.tw/image/data/files/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://ezgolfer.com.tw/image/data/files/pop-slots-free-vegas-casino-slots-machine-game-coin-master_GM406889139.pdfIn PDF document text
    • https://ezgolfer.com.tw/image/data/files/coin-master-free-daily-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://ezgolfer.com.tw/image/data/files/free-robux-no-verification-needed_GM431946152.pdfIn PDF document text
    • https://ezgolfer.com.tw/image/data/files/free-minecraft-alt-accounts_GM479516143.pdfIn PDF document text
    • https://ezgolfer.com.tw/image/data/files/minecraft-pe-free-apk_GM479516143.pdfIn PDF document text
    • https://ezgolfer.com.tw/image/data/files/coin-master-free-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • https://ezgolfer.com.tw/image/data/files/minecraft-windows-10-edition-free_GM479516143.pdfIn PDF document text
    • https://ezgolfer.com.tw/image/data/files/free-350-robux_GM431946152.pdfIn PDF document text
    • https://ezgolfer.com.tw/image/data/files/roblox-free-redeem-cards-2021_GM431946152.pdfIn PDF document text
    • https://ezgolfer.com.tw/image/data/files/minecraft-116-apk-download_GM479516143.pdfIn PDF document text
    • https://ezgolfer.com.tw/image/data/files/roblox-rewards_GM431946152.pdfIn PDF document text
    • https://ezgolfer.com.tw/image/data/files/roblox-murder-mytery-2-hack-script_GM431946152.pdfIn PDF document text
    • https://ezgolfer.com.tw/image/data/files/comment-hacker-les-map-roblox_GM431946152.pdfIn PDF document text
    • https://ezgolfer.com.tw/image/data/files/how-do-you-get-free-clothes-on-roblox_GM431946152.pdfIn PDF document text
    • https://ezgolfer.com.tw/image/data/files/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00003628.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3628 24052 bytes
SHA-256: 8bd994d49d30e33a707ac6e47f3aee1858450506473c228124da06beeb2164bf
font_01_sfnt_off00006d20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D20 18996 bytes
SHA-256: 37ed63e74a535a76445230d9c7f377bd7b9b2eaccd5f624491c1f2f15b22ef77

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