Malicious PDF — malware analysis report

Static analysis result for SHA-256 d035c16a616f35cd…

MALICIOUS

PDF

45.6 KB Created: 2021-05-16 07:31:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: a0f4483b2108c49778b8091bf998dba0 SHA-1: bcf11ea4b1261cf67bd0ab58f676f799b0289a77 SHA-256: d035c16a616f35cd8b92cf30d60b20e127110e9d77b3e5bbfa8f38cdb3c2d5d1
142 Risk Score

Malware Insights

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

This PDF document contains numerous links to external websites, many of which are presented as game hacks or generators for popular mobile games. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of such links, suggesting a malicious attempt to redirect users to potentially harmful sites. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9507

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-hack-mod-apk-download-game-hack PDF link annotation
    • https://kaospartai-murah.com/ckfinder/userfiles/files/free-robux-place_GM431946152.pdfIn PDF document text
    • https://kaospartai-murah.com/ckfinder/userfiles/files/best-minecraft-hacked-client-2021_GM479516143.pdfIn PDF document text
    • https://kaospartai-murah.com/ckfinder/userfiles/files/spin-coin_GM406889139.pdfIn PDF document text
    • https://kaospartai-murah.com/ckfinder/userfiles/files/how-to-hack-a-minecraft-server-and-make-yourself-op_GM479516143.pdfIn PDF document text
    • https://kaospartai-murah.com/ckfinder/userfiles/files/how-do-i-get-robux_GM431946152.pdfIn PDF document text
    • https://kaospartai-murah.com/ckfinder/userfiles/files/hack-coin-master-mod-apk_GM406889139.pdfIn PDF document text
    • https://kaospartai-murah.com/ckfinder/userfiles/files/coin-master-free-coin-and-spin-app_GM406889139.pdfIn PDF document text
    • https://kaospartai-murah.com/ckfinder/userfiles/files/reddit-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://kaospartai-murah.com/ckfinder/userfiles/files/coin-master-links-free-spins_GM406889139.pdfIn PDF document text
    • https://kaospartai-murah.com/ckfinder/userfiles/files/coin-master-daily-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://kaospartai-murah.com/ckfinder/userfiles/files/how-to-become-a-hacker-in-roblox_GM431946152.pdfIn PDF document text
    • https://kaospartai-murah.com/ckfinder/userfiles/files/coin-master-cheat-engine-hack_GM406889139.pdfIn PDF document text
    • https://kaospartai-murah.com/ckfinder/userfiles/files/roblox-robux-generator_GM431946152.pdfIn PDF document text
    • https://kaospartai-murah.com/ckfinder/userfiles/files/coin-master-free-daily-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://kaospartai-murah.com/ckfinder/userfiles/files/coin-master-hacks-no-surveys_GM406889139.pdfIn PDF document text
    • https://kaospartai-murah.com/ckfinder/userfiles/files/coin-master-free-spins-facebook_GM406889139.pdfIn PDF document text
    • https://kaospartai-murah.com/ckfinder/userfiles/files/roblox-script-hack_GM431946152.pdfIn PDF document text
    • https://kaospartai-murah.com/ckfinder/userfiles/files/coin-master-free-spin-download_GM406889139.pdfIn PDF document text
    • https://kaospartai-murah.com/ckfinder/userfiles/files/coin-master-free-spins-link-download_GM406889139.pdfIn PDF document text
    • https://kaospartai-murah.com/ckfinder/userfiles/files/free-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004d1a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D1A 24288 bytes
SHA-256: 362d79c0a552a41e3163bb05b0982efd3a8f43d2bf4363e8435315410e77f663
font_01_sfnt_off000084c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84C2 2920 bytes
SHA-256: 601c50867a41b9362538ff18e5f9479a0f9badf698aaf1eb7e88469c11719db7
font_02_sfnt_off00008edc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EDC 18472 bytes
SHA-256: 4c2b378107411dd89e89d15d6fc14f40e4cc39fe2ce380ce578c72ff76b0796b

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