Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ee86517fc75fc5b…

MALICIOUS

PDF

35.1 KB Created: 2021-05-10 12:07:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 95686a9b4ecc6abf802f4a66ac177de0 SHA-1: c1879054b97b3352fdfd39cfe18b6b22e23f858d SHA-256: 1ee86517fc75fc5bfd305458c8bf625feb56f157d3d688382a93bd5ae6ce5ef7
170 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a critical heuristic firing for a malicious redirector link, specifically pointing to a "free generator / game hack" lure for Roblox. This link is designed to trick users into clicking it, likely leading to further malicious content or downloads. The presence of a fake CAPTCHA heuristic further supports the social engineering aspect of this attack, aiming to coerce the user into interaction.

Machine Learning

  • Nyx PDF Classifier clean score 0.0306

Heuristics 5

  • 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
  • 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 https://netcdn.xyz/app/431946152/hacks-para-roblox-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_003_off00002ffd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2FFD 24268 bytes
SHA-256: 14a0d8ff09c42cb0e965d2d7fe2a11e6a299a6cc1636a3e26f6ff2e9b26e228e
font_01_sfnt_off0000678d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x678D 18336 bytes
SHA-256: 2c3591d0816fe2ec07885ff461cab1f1278707ef551a51e26631ad2b93349e2a

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