Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9b09bac5cadd832…

MALICIOUS

PDF

36.0 KB Created: 2021-07-04 12:27:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: bd5b744babb47ce9d556a6a5bc58e857 SHA-1: efb447977c7150a61ab5cb565cb4244eef43ff7c SHA-256: b9b09bac5cadd83237e57416bce999b7dd965cb2e8cd0832a656a62d6eae52eb
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 0.9980

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/406889139/coin-master-free-spins-link-today-blogspot-game-hack PDF link annotation
    • http://nationshield.ae/userfiles/files/roblox-speed-hacks-that-work_GM431946152.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/free-roebucks-com_GM431946152.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/roblox-hacking-weird_GM431946152.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/watch-ads-for-robux_GM431946152.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/hacker-mask-roblox_GM431946152.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/free-robux-2021_GM431946152.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/www-roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/how-to-get-free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/coin-master-20-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/roblox-cheat-engine-bypass-updated-2021-unpatched_GM431946152.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/pokemon-go-free-or-armored-mewtwo_GM1094591345.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/tryrbx-site-free-robux_GM431946152.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/can-i-have-robux_GM431946152.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/coin-master-free-spins-hack-without-human-verification_GM406889139.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/hack-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/fond-dcran-gamer-roblox-hack_GM431946152.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/sondage-for-free-robux_GM431946152.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/how-to-get-free-robux-for-no-money_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
stream_002_off000033f5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x33F5 23048 bytes
SHA-256: 83521802ec186ed5d0483fe3cc6222bbc400cf93d16f6db8257ac42f5c8edb20
font_01_sfnt_off00006800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6800 18988 bytes
SHA-256: 5be1f4e63a68f7f95930536f7900fd499aa82cc302806747a3bcc7f79712d029

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