Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2c3e9131b8c44e1…

MALICIOUS

PDF

44.2 KB Created: 2021-05-16 09:39:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 23cdbedcf8fa4d8bd44576ab78b1c56c SHA-1: 11f4ca310852c6938f55c421c1b1000eabc20bad SHA-256: c2c3e9131b8c44e148900f43908df83118b8dec82b11efc66d314784e59dc04e
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 0.9648

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/406889139/spin-coin-master-hack-game-hack PDF link annotation
    • https://www.tw-storage.com.tw/upload/files/minecraft-apk-free-download-016-0_GM479516143.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/roblox-free-wings_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/how-to-hack-robux_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/free-spins-on-coin-master-game_GM406889139.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/body-roblox_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/free-robux-easy-and-fast_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/roblox-hacks-and-cheats_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/free-robux-hack-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/how-to-download-wurst_GM479516143.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/master-coin-free-spin-daily_GM406889139.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/free-robux-cards_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/twitter-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/how-to-get-free-robux-without-verifying-2021_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/free-robux-picture_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/coin-master-village-3_GM406889139.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/oprewards-com-robux_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/robux-com-free_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/give-me-free-robux_GM431946152.pdfIn PDF document text
    • https://www.tw-storage.com.tw/upload/files/free-spins-coin-master-links-thursday-november-28-2021_GM406889139.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_off00004951.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4951 24996 bytes
SHA-256: 24fbf8b24a1659bc60dca99eafb25e3adaaae80440557819067f61a4e7021129
font_01_sfnt_off00008187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8187 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00008b39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B39 17892 bytes
SHA-256: a3a1b04a82279d9b81c305d9015fdfbc4eb608af79be49bd49bec6a16d15ba5c