Malicious PDF — malware analysis report

Static analysis result for SHA-256 383dafc5c317743e…

MALICIOUS

PDF

42.1 KB Created: 2021-05-14 12:37:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 11bdd7adcb9bebe72d6ac3568b03ba2c SHA-1: 59e9ca9ac0db8c08d192aa16354ff53974c5ec45 SHA-256: 383dafc5c317743e032feaddef8f26b38f8bd9200486b95fcc7691623582457b
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 SEO-optimized to appear as game hack guides. The primary URL, 'https://netcdn.xyz/app/406889139/coin-master-hack-spin-generator-game-hack', suggests a lure for game-related cheats. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of links designed to manipulate search results, likely leading to malicious sites. No scripts were extracted, but the document's structure and embedded URLs strongly suggest it's a phishing or malware distribution lure.

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/coin-master-hack-spin-generator-game-hack PDF link annotation
    • http://kovroff.com.ua/images/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://kovroff.com.ua/images/how-to-get-minecraft-for-free-on-mobile_GM479516143.pdfIn PDF document text
    • http://kovroff.com.ua/images/free-spins-coin-master-2021-no-verification_GM406889139.pdfIn PDF document text
    • http://kovroff.com.ua/images/coin-master-free-spins-hack-iphone_GM406889139.pdfIn PDF document text
    • http://kovroff.com.ua/images/coin-master-hack-ios-apk_GM406889139.pdfIn PDF document text
    • http://kovroff.com.ua/images/how-to-get-free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://kovroff.com.ua/images/coins-master-hack_GM406889139.pdfIn PDF document text
    • http://kovroff.com.ua/images/free-robux-no-verify-2021_GM431946152.pdfIn PDF document text
    • http://kovroff.com.ua/images/free-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://kovroff.com.ua/images/coin-master-free-card-link-today_GM406889139.pdfIn PDF document text
    • http://kovroff.com.ua/images/roblox-exploit-scripts_GM431946152.pdfIn PDF document text
    • http://kovroff.com.ua/images/minecraft-multiplayer-free_GM479516143.pdfIn PDF document text
    • http://kovroff.com.ua/images/free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://kovroff.com.ua/images/rbxoffers-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://kovroff.com.ua/images/how-to-get-free-robux-without-verification-or-surveys_GM431946152.pdfIn PDF document text
    • http://kovroff.com.ua/images/how-to-download-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://kovroff.com.ua/images/hack-coin-master-with-lucky-patcher_GM406889139.pdfIn PDF document text
    • http://kovroff.com.ua/images/get-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://kovroff.com.ua/images/coin-master-hack-cheat-generator-d_GM406889139.pdfIn PDF document text
    • http://kovroff.com.ua/images/minecraft-hacks-ps4_GM479516143.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_off00004b7b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B7B 24440 bytes
SHA-256: 5a2db273c39dc4a8859b17fd7687c4daa79faa6a6199da0d64fb6582c60afc45
font_01_sfnt_off00008334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8334 17892 bytes
SHA-256: fb469e3bf9035f41b30956febb327ba05298378f8328666f03cb40abfa022080

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