Malicious PDF — malware analysis report

Static analysis result for SHA-256 3440a2dd7b09d950…

MALICIOUS

PDF

42.2 KB Created: 2021-05-16 00:01:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: c1c6b1ec5677d8d394817448daacc5c4 SHA-1: 76687fefae70c811a436cf51585880b37c6b4b2b SHA-256: 3440a2dd7b09d950919ec3076422cad46ccd284b0e9f310d89cddf3c85fee748
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 0.9971

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/cm-free-spins-game-hack PDF link annotation
    • http://cornerstonedurham.com/images/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://cornerstonedurham.com/images/coin-master-blogspot-links_GM406889139.pdfIn PDF document text
    • http://cornerstonedurham.com/images/coin-master-hack-app_GM406889139.pdfIn PDF document text
    • http://cornerstonedurham.com/images/apps-to-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://cornerstonedurham.com/images/minecraft-hacked-client-112-2_GM479516143.pdfIn PDF document text
    • http://cornerstonedurham.com/images/master-free-spin_GM406889139.pdfIn PDF document text
    • http://cornerstonedurham.com/images/free-spins-and-coins-coin-master-links_GM406889139.pdfIn PDF document text
    • http://cornerstonedurham.com/images/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • http://cornerstonedurham.com/images/free-coin_GM406889139.pdfIn PDF document text
    • http://cornerstonedurham.com/images/roblox-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://cornerstonedurham.com/images/free-robux-generator-without-verification_GM431946152.pdfIn PDF document text
    • http://cornerstonedurham.com/images/how-to-make-a-modded-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://cornerstonedurham.com/images/free-robux-no-human-verify_GM431946152.pdfIn PDF document text
    • http://cornerstonedurham.com/images/hack-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://cornerstonedurham.com/images/robuxglobalcom_GM431946152.pdfIn PDF document text
    • http://cornerstonedurham.com/images/ways-to-earn-robux_GM431946152.pdfIn PDF document text
    • http://cornerstonedurham.com/images/wurst-112-2_GM479516143.pdfIn PDF document text
    • http://cornerstonedurham.com/images/kuso-icu-roblox-hack_GM431946152.pdfIn PDF document text
    • http://cornerstonedurham.com/images/how-to-get-free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://cornerstonedurham.com/images/free-minecraft-maps_GM479516143.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_003_off000047e2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47E2 29104 bytes
SHA-256: adee0758bed7367c5662c9f54c5d3a585a4a0729da2ae75212e965ffef4774e2
font_01_sfnt_off000084b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84B7 17672 bytes
SHA-256: c7edaacf3d8891068ee17a427980e4b8712b9880538c2e482dce739b11255869

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