Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bdfd309441fb516…

MALICIOUS

PDF

27.7 KB Created: 2021-06-25 23:47:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 039cfbea9b10a8cbe52b1ca436c34279 SHA-1: 0953fb6aab4e5fe586f9e6527ecbcc7deb1731fe SHA-256: 3bdfd309441fb51632e59c568c5877a3f6c3805192312737cc0fc7c5045123d4
210 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a lure for a 'free generator / game hack' and displays a fake CAPTCHA, aiming to trick the user into clicking a link. This link, http://netcdn.co/app/431946152/roblox-free-items-hack-2021-game-hack, leads to known malicious redirector infrastructure. The document's structure and content suggest it is designed to facilitate the download or execution of a second-stage payload, likely through social engineering tactics.

Machine Learning

  • Nyx PDF Classifier clean score 0.0330

Heuristics 6

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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
  • 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/roblox-free-items-hack-2021-game-hack In 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_001_off000016ed.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x16ED 21668 bytes
SHA-256: 759c3041d5a13d6f5a204f0c4993d8e9f2e671c141ffeaa3281b5ee93634c616
font_01_sfnt_off000046bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x46BC 19588 bytes
SHA-256: d3d691a0c2bb346fca836648dbf481b7891d6a4159afd9d9f017686df1efd814

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