Malicious PDF — malware analysis report

Static analysis result for SHA-256 25c1b117a41e9410…

MALICIOUS

PDF

45.5 KB Created: 2021-05-14 07:32:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: d1774779f7492609d9818a796aa148b1 SHA-1: 7c0c1c26d5a90b1d8ba4e0f61e0c586717c2e43c SHA-256: 25c1b117a41e94105f3125bd344a79ce1e1bc638080e262d084df3cc4ba1a76b
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file 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 0.9507

Heuristics 4

  • 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/479516143/minecraft-building-hacks-game-hack PDF link annotation
    • http://umksn.pl/images/daily-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://umksn.pl/images/free-custom-minecraft-skins_GM479516143.pdfIn PDF document text
    • http://umksn.pl/images/free-robux-no-human-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://umksn.pl/images/how-to-get-free-robux-instantly_GM431946152.pdfIn PDF document text
    • http://umksn.pl/images/how-to-get-free-robux-on-mobile_GM431946152.pdfIn PDF document text
    • http://umksn.pl/images/roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://umksn.pl/images/robux-gainer_GM431946152.pdfIn PDF document text
    • http://umksn.pl/images/free-robux-no-email_GM431946152.pdfIn PDF document text
    • http://umksn.pl/images/coin-master-3533-android-hack_GM406889139.pdfIn PDF document text
    • http://umksn.pl/images/kuso-icu-roblox-hack_GM431946152.pdfIn PDF document text
    • http://umksn.pl/images/roblox-com-free_GM431946152.pdfIn PDF document text
    • http://umksn.pl/images/coin-master-deals_GM406889139.pdfIn PDF document text
    • http://umksn.pl/images/coin-master-links-to-get-free-spins_GM406889139.pdfIn PDF document text
    • http://umksn.pl/images/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://umksn.pl/images/coin-master-games-hack_GM406889139.pdfIn PDF document text
    • http://umksn.pl/images/how-to-play-coin-master_GM406889139.pdfIn PDF document text
    • http://umksn.pl/images/how-to-get-free-roblox-gift-cards_GM431946152.pdfIn PDF document text
    • http://umksn.pl/images/free-robux-website_GM431946152.pdfIn PDF document text
    • http://umksn.pl/images/coin-master-hack-generator-tool_GM406889139.pdfIn PDF document text
    • http://umksn.pl/images/minecraft-hacked-client-bedrock_GM479516143.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_003_off00004a26.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A26 25468 bytes
SHA-256: 2bded5f4b3e0c8363fbd8be9be3e23e7a03063cfdb6e62937cf654528249ff06
font_01_sfnt_off000083c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83C6 3092 bytes
SHA-256: 3811f2fb1880daf4953efcc9c7427d9b438bced237490b00be4a6ec3ecea79e0
font_02_sfnt_off00008e71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E71 18628 bytes
SHA-256: 03be4b6b10a4c687c6c89c16a3bf013511456428a76c01e3ee63370f4522cf94

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