Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b737a91f9b669b7…

MALICIOUS

PDF

34.5 KB Created: 2021-07-06 00:13:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: a890c288e6fbcf24468887c2d4b2cec8 SHA-1: 6e64479b837b7a9a36d7bb1d6019d279899b48f2 SHA-256: 4b737a91f9b669b78f67ffba245a9978a383c35945fbc2b02e280a73a9b2532c
82 Risk Score

Malware Insights

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

The PDF document contains a high-severity heuristic indicating it links to a game hack lure. The document body and extracted URLs reinforce this, pointing to sites offering 'free generators' or 'hacks' for popular games. The primary malicious URL identified is http://netcdn.tw/app/406889139/hack-coin-master-343-apk-game-hack, which likely serves as a redirector to a malicious payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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/hack-coin-master-343-apk-game-hack PDF link annotation
    • http://librarysenior.com/repository/is-minecraft-earth-free_GM479516143.pdfIn PDF document text
    • http://librarysenior.com/repository/roblox-redeem-code-free-2021_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/are-robux-generators-safe_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/hacker-decal-roblox_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/how-to-get-free-items-on-roblox_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/roblox-free-clothes-hack_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/http-coin-master-hack-club_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/pokemon-go-free-coins-generator_GM1094591345.pdfIn PDF document text
    • http://librarysenior.com/repository/coin-master-free-spins-11-01-2021_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/redeem-roblox-card-free_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/free-coin-spin-daily-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/roblox-free-skin_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/coin-master-fun-free-spins_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/free-robux-obby_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/http-bitly-coin-master-free-2021-spins_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/coin-master-spin-link-today-free_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/roblox-hack-com_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/coin-master-500-free-spins_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/roblox-earn-robux_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/cheat-roblox-2021-la-dernier-misajoure_GM431946152.pdfIn PDF document text
    • https://www.urcouponsdeal.com/2019/03/coin-master-free-spin-and-coin-links.htmlIn 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
font_00_sfnt_off0000317b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x317B 22504 bytes
SHA-256: 39ccdaac16a1b21b9243a399d47b1cbf0826348504da7181be9565fa4ab63068
font_01_sfnt_off00006392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6392 18416 bytes
SHA-256: 71d2f8e68c1f2ddfa4df4e7d7e9f9d2f4e9296d26332e2415442221fc5a89d52

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