Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4e9275891ca3781…

MALICIOUS

PDF

34.9 KB Created: 2021-05-25 07:30:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 159e09da494f65b4e6f8e4d2fae3a77d SHA-1: 69f2331e773a15b5369be40806dfc604c71081c5 SHA-256: d4e9275891ca37811505388a246eb3c9384bb3a9b075491e56b8e63fbd5311a0
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a malicious redirector link, specifically advertising a 'free generator / game hack'. The embedded URL leads to a site known for malicious redirects, likely serving as a lure for users seeking in-game currency or cheats. While no scripts were extracted, the document's structure and embedded URL strongly suggest a phishing or scam attempt to redirect users to a malicious website.

Machine Learning

  • Nyx PDF Classifier clean score 0.0718

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/how-to-get-free-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_002_off00002bea.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2BEA 26168 bytes
SHA-256: daa2fc7ea93ca82be8f33d09efe0f8577be43adfa0ea460025b71ce71c633bbc
font_01_sfnt_off00006757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6757 18280 bytes
SHA-256: 2eeeedfcb2f224ab556fa0ab031baeab03f86dcbcf90e3baaaf5b6d88536dec3

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