Malicious PDF — malware analysis report

Static analysis result for SHA-256 b88749b539ca60dc…

MALICIOUS

PDF

33.4 KB Created: 2021-07-20 14:35:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: bbdef75cd5363d817a3b28cc20505e63 SHA-1: 217a9a2e7afe53334b3c260f7c8bf625cf6feaa3 SHA-256: b88749b539ca60dceb594e9a1007cafd46865d63e0f253caee1e9222b014c09b
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 0.9942

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 http://netcdn.tw/app/835599320/free-tiktok-views-game-hack PDF link annotation
    • http://casabea.de/images/free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://casabea.de/images/free-spin-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://casabea.de/images/free-robux-cards_GM431946152.pdfIn PDF document text
    • http://casabea.de/images/coin-master-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://casabea.de/images/how-to-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
    • http://casabea.de/images/free-tiktok-followers-no-survey_GM835599320.pdfIn PDF document text
    • http://casabea.de/images/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://casabea.de/images/coin-master-free-spins-today-daily-links_GM406889139.pdfIn PDF document text
    • http://casabea.de/images/minecraft-life-hacks_GM479516143.pdfIn PDF document text
    • http://casabea.de/images/how-to-get-free-robux-without-verification_GM431946152.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
font_00_sfnt_off00002e82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E82 23072 bytes
SHA-256: df07fa6f880dce54c6820bf3cdc1be9924608775245f36de413e8cd6a22b0ff2
font_01_sfnt_off00006223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6223 17752 bytes
SHA-256: fbbed6aa406878393a00abdc0937322fa009c5b8448fdc35bdb3145f27770f26

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