Malicious PDF — malware analysis report

Static analysis result for SHA-256 9940238f220256f3…

MALICIOUS

PDF

35.3 KB Created: 2021-07-06 04:47:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: d5f7d2ebab28474d650918c62ab21cdf SHA-1: eacf2e6baff0d22d48bf16081e22c65401de8254 SHA-256: 9940238f220256f34fca9fa33cde391ab8e3efe2b6b2ebf3a5a19c0351fe273c
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous embedded links, identified as a link farm, that redirect to websites offering game hacks and generators. The primary lure appears to be related to 'Master Coin Free Spin Daily' and 'Roblox' hacks. The ML classifier strongly indicated maliciousness, and the presence of many external links suggests a phishing or malware distribution attempt. No scripts were extracted, but the document's structure and content point towards social engineering to drive traffic to potentially malicious 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/master-coin-free-spin-daily-game-hack PDF link annotation
    • http://www.glabintl.com/uploaded_files/userfiles/files/minecraft-maps-pe-free-download_GM479516143.pdfIn PDF document text
    • http://www.glabintl.com/uploaded_files/userfiles/files/free-robux-picture_GM431946152.pdfIn PDF document text
    • http://www.glabintl.com/uploaded_files/userfiles/files/how-to-hack-emojis-in-roblox_GM431946152.pdfIn PDF document text
    • http://www.glabintl.com/uploaded_files/userfiles/files/hack-to-find-people-ingame-in-roblox-cheat_GM431946152.pdfIn PDF document text
    • http://www.glabintl.com/uploaded_files/userfiles/files/minecraft-download-free-download_GM479516143.pdfIn PDF document text
    • http://www.glabintl.com/uploaded_files/userfiles/files/how-to-get-java-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://www.glabintl.com/uploaded_files/userfiles/files/get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.glabintl.com/uploaded_files/userfiles/files/show-me-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.glabintl.com/uploaded_files/userfiles/files/roblox-hacking-simulator-codes_GM431946152.pdfIn PDF document text
    • http://www.glabintl.com/uploaded_files/userfiles/files/how-to-get-free-robux-for-kids_GM431946152.pdfIn PDF document text
    • http://www.glabintl.com/uploaded_files/userfiles/files/coin-master-hack-apk-july-2021_GM406889139.pdfIn PDF document text
    • http://www.glabintl.com/uploaded_files/userfiles/files/coin-master-game-free-play-online_GM406889139.pdfIn PDF document text
    • http://www.glabintl.com/uploaded_files/userfiles/files/free-fortnite-dances-roblox_GM431946152.pdfIn PDF document text
    • http://www.glabintl.com/uploaded_files/userfiles/files/roblox-hack-999999-robux-ios_GM431946152.pdfIn PDF document text
    • http://www.glabintl.com/uploaded_files/userfiles/files/how-to-speed-hack-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.glabintl.com/uploaded_files/userfiles/files/www-roblox-com-robux-free_GM431946152.pdfIn PDF document text
    • http://www.glabintl.com/uploaded_files/userfiles/files/how-to-get-free-roebucks_GM431946152.pdfIn PDF document text
    • http://www.glabintl.com/uploaded_files/userfiles/files/free-robux-no-human-verification-generator_GM431946152.pdfIn PDF document text
    • http://www.glabintl.com/uploaded_files/userfiles/files/free-roblox-hair-to-wear_GM431946152.pdfIn PDF document text
    • http://www.glabintl.com/uploaded_files/userfiles/files/get-free-spins-on-coin-master_GM406889139.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_002_off00003239.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3239 23140 bytes
SHA-256: 3b7f2cf0e8198c57ac71f7432edbd99e320845f583650eac9429b4f7bdd7b309
font_01_sfnt_off00006680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6680 18596 bytes
SHA-256: 115892fac058e21728dd73f14dd50efb9625691fb0bdc47d6e9343c2bb96a73b

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