Malicious PDF — malware analysis report

Static analysis result for SHA-256 3645f4dd3700dbd2…

MALICIOUS

PDF

43.8 KB Created: 2021-05-12 21:31:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 65d331a5c215db0d25b0d8b47516bf12 SHA-1: 4c030f88bfbb38560cd96d383386f1c376e4967d SHA-256: 3645f4dd3700dbd2b8ccc76d8329a6a497fb6d7511033085e2f81b608d1de07a
142 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which are disguised as PDFs related to game hacks and free currency. The primary lure appears to be 'websites-for-robux-game-hack' hosted on netcdn.xyz. The document's structure and content strongly suggest it's part of a link farm designed to drive traffic to potentially malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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/431946152/websites-for-robux-game-hack PDF link annotation
    • http://bemviverclin.com.br/images/coin-master-free-spins-promo-code_GM406889139.pdfIn PDF document text
    • http://bemviverclin.com.br/images/can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://bemviverclin.com.br/images/buxblast-com-robux_GM431946152.pdfIn PDF document text
    • http://bemviverclin.com.br/images/free-coins-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://bemviverclin.com.br/images/how-do-you-hack-minecraft_GM479516143.pdfIn PDF document text
    • http://bemviverclin.com.br/images/coin-master-card-collection-hack_GM406889139.pdfIn PDF document text
    • http://bemviverclin.com.br/images/free-minecraft-alts_GM479516143.pdfIn PDF document text
    • http://bemviverclin.com.br/images/how-to-hack-into-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://bemviverclin.com.br/images/how-to-get-roblox-premium-for-free-2021_GM431946152.pdfIn PDF document text
    • http://bemviverclin.com.br/images/free-spins-and-coins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://bemviverclin.com.br/images/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdfIn PDF document text
    • http://bemviverclin.com.br/images/how-to-get-free-golden-card-in-coin-master_GM406889139.pdfIn PDF document text
    • http://bemviverclin.com.br/images/coin-master-invite-friends-free-spins_GM406889139.pdfIn PDF document text
    • http://bemviverclin.com.br/images/coin-master-hack-without-verify_GM406889139.pdfIn PDF document text
    • http://bemviverclin.com.br/images/www-roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://bemviverclin.com.br/images/how-to-get-free-shields-on-coin-master_GM406889139.pdfIn PDF document text
    • http://bemviverclin.com.br/images/minecraft-ios-mods_GM479516143.pdfIn PDF document text
    • http://bemviverclin.com.br/images/coin-master-free-spins-moonactive_GM406889139.pdfIn PDF document text
    • http://bemviverclin.com.br/images/robux-free-robux_GM431946152.pdfIn PDF document text
    • http://bemviverclin.com.br/images/free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://krnl.rocksIn 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_off00004988.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4988 28100 bytes
SHA-256: d6b72111d2dd86873722e9d72d086210610bd9ab77a349308e886c6b798898e2
font_01_sfnt_off00008896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8896 18436 bytes
SHA-256: a0892a7c6a4df3f32c2c8d55016a82ae07dc296688f989f87a4165413345201d

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