Malicious PDF — malware analysis report

Static analysis result for SHA-256 7badc6f883b658a1…

MALICIOUS

PDF

41.6 KB Created: 2021-05-17 22:01:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 6e8cbb03ad18d0d683fc1a4f870e1892 SHA-1: 307adedffe04670a7f1f09ade5dc80f5ada5dabe SHA-256: 7badc6f883b658a11d1b06f4a79c2e06d60d3ca0c76b7ab60dfe1dc41b603623
142 Risk Score

Malware Insights

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

This PDF document contains numerous links, including one to a 'free generator / game hack' redirector, indicating a lure for users to click on potentially malicious content. The document's structure and embedded links suggest it is part of a link farm designed to drive traffic to scam or malware sites. No scripts were extracted, but the presence of multiple external links and the ML classification strongly suggest malicious intent.

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/link-for-free-spins-on-coin-master-game-hack PDF link annotation
    • https://smark.com.tw/image/data/files/coin-master-free-spins-link-31-march-2021_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/free-robux-app_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/coin-master-free-2021-spin-link-today_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/coin-master-free-spins-hack-but-no-surveys_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/lastrick-com-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/how-to-get-free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/coin-master-game-hacking-tricks_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/how-much-robux-can-you-get-with-1-million-dollars_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/roblox-apk-hack_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/where-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/wurst-hacked-client-112-2_GM479516143.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/coin-master-hacks-for-iphone_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/coin-master-daily-free-spins-25_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/robux-generator-no-verification-needed_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/coin-master-hack-to-get-free-spins_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/free-robux-clothes_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/free-spin-online-tool-coin-master_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/blogspot-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/free-robux-hack-2021_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_off000048b8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48B8 24716 bytes
SHA-256: ce5710385e6135aefd8d0c61217f4168b96ed0f1603c5737a0bc67e4e92f1581
font_01_sfnt_off0000811e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x811E 18056 bytes
SHA-256: 722d781e478cd0d1a4785e673d05427d87221dd2f44d1d4595ffa323240eece4

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