Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef5ab77c75d20eaf…

MALICIOUS

PDF

41.1 KB Created: 2021-05-11 02:42:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 284113d221e397647798c585fe66436a SHA-1: 0eda525a11b1ce4c760c013d53c811e8366bb75d SHA-256: ef5ab77c75d20eaff119ec1e594d9ba277b71eb9ecc08b56acc4555fb98a53f4
130 Risk Score

Malware Insights

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

The PDF contains embedded links that are identified as malicious redirectors, specifically targeting users with a lure related to 'Roblox Website Robux' and a 'game hack generator'. The document body and heuristics indicate a clear intent to trick the user into clicking these links, likely leading to further malicious content or downloads. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier clean score 0.0125

Heuristics 4

  • 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.
  • 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-website-robux-game-hack In 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_003_off000035cf.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x35CF 26592 bytes
SHA-256: 3127eda43cb175b113b393497109d262362a43ade9c4dfd5a159404742b5f182
font_01_sfnt_off00007232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7232 3916 bytes
SHA-256: 848a4fda411ca301b137e4e4f0df75b03cd3e2ed808d98f2a4afb57dc183a5a3
font_02_sfnt_off00007f0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F0C 18348 bytes
SHA-256: cc91b2fc9b75ec06329357e94e6432728e351a563ac2c83234cad17065899ff2

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