Malicious PDF — malware analysis report

Static analysis result for SHA-256 94c57b26cc0a28a0…

MALICIOUS

PDF

33.3 KB Created: 2021-07-05 17:40:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 6a4264df49af046f72876273351630a0 SHA-1: 82bfd0fb51f86d3aea39cbac1f36a7d31f03d53f SHA-256: 94c57b26cc0a28a02db6e38740eb85fa4effb89cd1a2563822a2c83c6e23d513
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-hack-account-game-hack PDF link annotation
    • http://foo.com.tw/files/sites-for-free-robux_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/free-800-robux_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/how-to-get-free-likes-on-tiktok_GM835599320.pdfIn PDF document text
    • http://foo.com.tw/files/using-cheat-engine-on-roblox_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/free-roblox-gift-card_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/redeem-roblox-virtual-item-free-codes-2021_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/how-to-get-free-robux-ant_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/how-to-hack-roblox-on-phone_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/hpw-tp-change-your-name-in-roblox-for-free-2021_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/bloxburg-hack-roblox-pastebin_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/coin-master-cheats-2021_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/coin-master-free-blogspot_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/free-robux-working_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/roblox-cheat-code-for-admin_GM431946152.pdfIn PDF document text
    • http://foo.com.tw/files/coin-master-free-coins_GM406889139.pdfIn PDF document text
    • http://foo.com.tw/files/how-do-people-make-roblox-hack-tools_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_off00002c6d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2C6D 22996 bytes
SHA-256: 01726652acb71ae837ae6a2b8732e71f192e69a8305ef3d97d02ae583f35561a
font_01_sfnt_off00005fcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FCB 18144 bytes
SHA-256: 5125aa98c5b35abf88d287f9ef78779f445638ea75c3f9a40f4af8ecfd5d1128

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