Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b33566bae2a6cf5…

MALICIOUS

PDF

48.1 KB Created: 2021-06-03 22:05:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: ccb411bc36bd7c121492d81f0e7925d4 SHA-1: 2daa107c466ce0a0e5858b0c0171f270331a9de7 SHA-256: 1b33566bae2a6cf576c04a283426b41df62b597038be8144da65393458bc4d74
142 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.online/app/406889139/coin-master-daily-free-spins-link-march-2021-game-hack PDF link annotation
    • http://www.js100.com/uploads/ckeditor/files/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/minecraft-tiktok-hacks_GM479516143.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/pokemon-go-free-vpn-android_GM1094591345.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-coins-coin-master-no-human-verification_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/how-do-you-hack-roblox_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-heaven-links-free-spins_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/pokemon-go-free-zaragoza_GM1094591345.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-tiktok-views-no-verification_GM835599320.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-minecraft-java-edition-codes_GM479516143.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/how-to-win-free-robux_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-free-spins-hack-but-no-surveys_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/minecraft-free-online-games_GM479516143.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-hack-apk-app_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/how-to-get-free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/microsoft-free-robux_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/how-do-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/pubg-uc-redeem-code-midasbuy_GM1330123889.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-hack-version-download_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/adopt-me-roblox-hacks_GM431946152.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_004_off000052be.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52BE 25432 bytes
SHA-256: 1225088e0278eb4e63400ca0eab84393458782118e6a539e47f9e75a6a45b138
font_01_sfnt_off00008d81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D81 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00009733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9733 19044 bytes
SHA-256: 3f9aae1fdf8799fca0c9fecd68bec18923aee995b2022bf59fb0518bf5a4831a

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