Malicious PDF — malware analysis report

Static analysis result for SHA-256 effa3f51cbab9d02…

MALICIOUS

PDF

36.6 KB Created: 2021-05-15 06:31:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 6503aa7e00221d7bc0f38732cd5e9149 SHA-1: 7af9db78abcd5d2642284dbae733b7e5829293b6 SHA-256: effa3f51cbab9d024bc1ff00a99c7f95e063e5d8351b60e35f2331daf8c916a3
170 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it's a lure for game hacks and uses a malicious redirector. It also displays a fake CAPTCHA to trick the user into interacting with the document. The primary malicious URL identified is a redirector likely used to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier clean score 0.0272

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/roblox-robux-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_off00003197.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3197 25448 bytes
SHA-256: 4490811099a09c5eda2babc1d1ac1cb88403bcf34eabc94daa4f086bd2208098
font_01_sfnt_off00006bd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BD9 18836 bytes
SHA-256: 178e21c935189b9ae8d2771aa00877be99b32284632f745c9af091a94ae26d65

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