Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c8b59516a353e6c…

MALICIOUS

PDF

35.1 KB Created: 2021-07-09 00:32:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: b660ec377d330d107c37fc9f085f3831 SHA-1: e5c5762da6e446eb29ce760d0e7b3bdbb0ce6a1c SHA-256: 1c8b59516a353e6c2b720c834be432b282269978face7a99104bf59e703dea4d
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-chip-game-hack PDF link annotation
    • https://sinos.net/_common/admin/scripts/ckfinder/userfiles/files/coin-master-daily-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • https://sinos.net/_common/admin/scripts/ckfinder/userfiles/files/best-free-fps-games-on-roblox_GM431946152.pdfIn PDF document text
    • https://sinos.net/_common/admin/scripts/ckfinder/userfiles/files/can-you-earn-robux-for-free-anymore_GM431946152.pdfIn PDF document text
    • https://sinos.net/_common/admin/scripts/ckfinder/userfiles/files/lazyblocks-com-free-robux_GM431946152.pdfIn PDF document text
    • https://sinos.net/_common/admin/scripts/ckfinder/userfiles/files/free-robux-no-verification-needed_GM431946152.pdfIn PDF document text
    • https://sinos.net/_common/admin/scripts/ckfinder/userfiles/files/how-to-hack-a-roblox-account-easy_GM431946152.pdfIn PDF document text
    • https://sinos.net/_common/admin/scripts/ckfinder/userfiles/files/coin-master-daily-spin-free_GM406889139.pdfIn PDF document text
    • https://sinos.net/_common/admin/scripts/ckfinder/userfiles/files/coin-master-free-coins-no-human-verification_GM406889139.pdfIn PDF document text
    • https://sinos.net/_common/admin/scripts/ckfinder/userfiles/files/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • https://sinos.net/_common/admin/scripts/ckfinder/userfiles/files/free-robux-just-click_GM431946152.pdfIn PDF document text
    • https://sinos.net/_common/admin/scripts/ckfinder/userfiles/files/coin-master-rewards-free-spins_GM406889139.pdfIn PDF document text
    • https://sinos.net/_common/admin/scripts/ckfinder/userfiles/files/coin-master-34-4-free-download_GM406889139.pdfIn PDF document text
    • https://sinos.net/_common/admin/scripts/ckfinder/userfiles/files/coin-master-gold-cards-hack_GM406889139.pdfIn PDF document text
    • https://sinos.net/_common/admin/scripts/ckfinder/userfiles/files/pokemon-go-free-remote-raid-pass-february-2021_GM1094591345.pdfIn PDF document text
    • https://sinos.net/_common/admin/scripts/ckfinder/userfiles/files/hack-my-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://sinos.net/_common/admin/scripts/ckfinder/userfiles/files/free-coin-spin-daily-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://sinos.net/_common/admin/scripts/ckfinder/userfiles/files/is-minecraft-free-on-pc_GM479516143.pdfIn PDF document text
    • https://sinos.net/_common/admin/scripts/ckfinder/userfiles/files/minecraft-114-4-download_GM479516143.pdfIn PDF document text
    • https://sinos.net/_common/admin/scripts/ckfinder/userfiles/files/how-to-get-free-stuff-from-the-catalog-on-roblox_GM431946152.pdfIn PDF document text
    • https://sinos.net/_common/admin/scripts/ckfinder/userfiles/files/free-roblox-girl-clothes_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_off000032ab.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x32AB 23076 bytes
SHA-256: 5edde25a2cb1a37ec3c1b6247648fa0e7ea5a4a34f4bc08de3368260486ac2e1
font_01_sfnt_off00006699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6699 18340 bytes
SHA-256: 8ade81e28ce8b37bbf8c6334d153083f90bbf230f38b0c74cd71ceca923da60d

Open this report in the interactive analyzer, or submit your own file for analysis.