Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a6b5733a6091548…

MALICIOUS

PDF

50.4 KB Created: 2021-06-08 16:25:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 481228a25d131fd9e000959a8d2d636f SHA-1: dcc319a63daafa392dfa63b5fd9a4534140bed91 SHA-256: 1a6b5733a6091548abbfec74400b5d4122e39585501ce9cab2924254176569ef
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 0.9769

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.tw/app/431946152/how-to-ban-people-on-roblox-without-cheat-engine-commands-game-hack PDF link annotation
    • https://www.extrifit.com/uploads/ckfinder/userfiles/files/roblox-hack-999999-robux-cheat-engine_GM431946152.pdfIn PDF document text
    • https://www.extrifit.com/uploads/ckfinder/userfiles/files/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.extrifit.com/uploads/ckfinder/userfiles/files/coin-master-hack-blog_GM406889139.pdfIn PDF document text
    • https://www.extrifit.com/uploads/ckfinder/userfiles/files/games-on-roblox-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://www.extrifit.com/uploads/ckfinder/userfiles/files/coin-master-free-cards-link-2021_GM406889139.pdfIn PDF document text
    • https://www.extrifit.com/uploads/ckfinder/userfiles/files/hack-coin-master-no-human-verification_GM406889139.pdfIn PDF document text
    • https://www.extrifit.com/uploads/ckfinder/userfiles/files/roblox-weight-lifting-simulator-3-infinite-strength-hack-script_GM431946152.pdfIn PDF document text
    • https://www.extrifit.com/uploads/ckfinder/userfiles/files/how-to-make-a-group-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://www.extrifit.com/uploads/ckfinder/userfiles/files/roblox-rewards-site_GM431946152.pdfIn PDF document text
    • https://www.extrifit.com/uploads/ckfinder/userfiles/files/get-free-spins-link-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.extrifit.com/uploads/ckfinder/userfiles/files/roblox-old-avatar_GM431946152.pdfIn PDF document text
    • https://www.extrifit.com/uploads/ckfinder/userfiles/files/moonactive-free-spins-link_GM406889139.pdfIn PDF document text
    • https://www.extrifit.com/uploads/ckfinder/userfiles/files/roblox-install-free_GM431946152.pdfIn PDF document text
    • https://www.extrifit.com/uploads/ckfinder/userfiles/files/minecraft-free-apk-java-edition_GM479516143.pdfIn PDF document text
    • https://www.extrifit.com/uploads/ckfinder/userfiles/files/free-robux-on-phone_GM431946152.pdfIn PDF document text
    • https://www.extrifit.com/uploads/ckfinder/userfiles/files/claim-robux_GM431946152.pdfIn PDF document text
    • https://www.extrifit.com/uploads/ckfinder/userfiles/files/free-robux-gift-card_GM431946152.pdfIn PDF document text
    • https://www.extrifit.com/uploads/ckfinder/userfiles/files/free-roblox-clothes-codes_GM431946152.pdfIn PDF document text
    • https://www.extrifit.com/uploads/ckfinder/userfiles/files/coin-master-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • https://www.extrifit.com/uploads/ckfinder/userfiles/files/fake-robux-codes_GM431946152.pdfIn PDF document text
    • https://collectrobux.coIn 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_004_off00005722.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5722 26184 bytes
SHA-256: 5e5813e5ec1fbb9865fc7d906d10c09639cbeacac1edfc3d0570994df42adf0c
font_01_sfnt_off00009376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9376 2896 bytes
SHA-256: 0f10adbf105d053971010bc1f17c4dd55814d599674c84f75a6eb4cb46a9c89b
font_02_sfnt_off00009d6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9D6D 19956 bytes
SHA-256: 04a2d2a95872d31988389bad6e287094486a405acb79e059f706d71c003dedc9