Malicious PDF — malware analysis report

Static analysis result for SHA-256 adcc1b4679ad1305…

MALICIOUS

PDF

34.7 KB Created: 2021-06-20 11:10:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: c3d9b10adc006c6a1fd134886e85a50c SHA-1: 79d6719846b9453fb47f49f87e48d6121ff5b83b SHA-256: adcc1b4679ad13050de6962d7a08b689e95f9e103fd58d7f54eb89cb8c192814
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.co/app/431946152/get-more-robux-game-hack PDF link annotation
    • https://www.st-johns-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-cheat-to-get-free-spins_GM406889139.pdfIn PDF document text
    • https://www.st-johns-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/how-to-get-verified-on-tiktok-for-free-2021_GM835599320.pdfIn PDF document text
    • https://www.st-johns-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/bloxawards-com-earn-free-robux_GM431946152.pdfIn PDF document text
    • https://www.st-johns-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-hack-apk-35-8_GM406889139.pdfIn PDF document text
    • https://www.st-johns-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/minecraft-multiplayer-free_GM479516143.pdfIn PDF document text
    • https://www.st-johns-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/how-do-i-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.st-johns-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-official-fan-page_GM406889139.pdfIn PDF document text
    • https://www.st-johns-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/roblox-free-clothes-hack_GM431946152.pdfIn PDF document text
    • https://www.st-johns-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-hack-blog_GM406889139.pdfIn PDF document text
    • https://www.st-johns-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://www.st-johns-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/free-robux-hack-us-2021_GM431946152.pdfIn PDF document text
    • https://www.st-johns-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-apk-hack-2021_GM406889139.pdfIn PDF document text
    • https://www.st-johns-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/claim-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.st-johns-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/promo-codes-for-free-stuff-roblox-2021_GM431946152.pdfIn PDF document text
    • https://www.st-johns-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/free-minecraft-server-maker_GM479516143.pdfIn PDF document text
    • https://www.st-johns-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/free-minecraft-realm-codes_GM479516143.pdfIn PDF document text
    • https://www.st-johns-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/bloxpage-free-robux_GM431946152.pdfIn PDF document text
    • https://www.st-johns-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/100-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://www.st-johns-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/robux-free-co_GM431946152.pdfIn PDF document text
    • https://www.st-johns-stafford.staffs.sch.uk/admin/ckfinder/userfiles/files/free-roblox-accounts-with-robux-2021_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_off00003162.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3162 22288 bytes
SHA-256: 234fbc4a24c8ef782a8ec3d55b87e3fb9d2af234407d80d20dd86294270eab5c
font_01_sfnt_off000062df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62DF 18852 bytes
SHA-256: b803333033a1d948a3e2070f5da6cc90ff41f413c00fb3b83224e61e6ba756dc

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