Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5b374dba6d00022…

MALICIOUS

PDF

35.2 KB Created: 2021-07-04 08:31:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 1cbd0398281a820158e7cc0cd1ac210c SHA-1: d101ade1670ed39aa9b90cd73e88edaaadc90112 SHA-256: c5b374dba6d000229fd33882cbce925a01a1798ac205ebe30e66b135023d3ebb
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/431946152/how-to-get-free-robux-2021-easy-game-hack PDF link annotation
    • https://bioscience.kyst.com.tw/image/data/files/minecraft-free-demo_GM479516143.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/roblox-how-to-get-shirt-for-free_GM431946152.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/coin-master-hacks-xyz_GM406889139.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/free-robux-inspect-pastebin_GM431946152.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/coin-master-game-hack_GM406889139.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/coin-master-free-spin-realme-products_GM406889139.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/how-can-i-get-free-coinsn-coin-master_GM406889139.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/simplysarc_GM479516143.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/free-roblox-accounts-not-taken_GM431946152.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/moonactive-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/coin-master-links-free-spins_GM406889139.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/how-to-get-free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/legit-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/free-roblox-executor-201_GM431946152.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/how-to-hack-coin-master-cheat-engine_GM406889139.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/blue-shirt-roblox-free_GM431946152.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/how-to-get-free-robux-without-verification_GM431946152.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/roblox-cheat-codes_GM431946152.pdfIn PDF document text
    • https://bioscience.kyst.com.tw/image/data/files/roblox-how-to-get-a-shirt-for-free-with-bc_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_off00003036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3036 22768 bytes
SHA-256: eac3c5eb1cc8f322f55dd6ab569b7b0ac58260580fe3ad36da3cb25e6c7b6131
font_01_sfnt_off000062ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62EF 19568 bytes
SHA-256: 54573245d87bf425d09f38ae69d600f60ea89f6a8aa7cff0a6b46d42a5179ab9

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