Malicious PDF — malware analysis report

Static analysis result for SHA-256 d394f91b156cbe81…

MALICIOUS

PDF

41.5 KB Created: 2021-05-13 15:30:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a9c0b3c5bffdce1b97a8631fc6d93231 SHA-1: 5c9a515473b8d9eaa7283ad76f4f9ba9fac1492f SHA-256: d394f91b156cbe81f5dbbf16f677e13f5f213fd3f2fd52114f1cce847e590b97
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links that redirect to a known malicious infrastructure, specifically advertising a 'free Robux hack'. The document body and metadata also reference this lure. The presence of these links strongly suggests a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier clean score 0.0149

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/free-robux-hack-no-human-verification-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_off00003654.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3654 26284 bytes
SHA-256: 6523c0d09f637063b8a1a1b28f0e40e4273096a84851e9ffb504c6197eb21600
font_01_sfnt_off00007354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7354 2984 bytes
SHA-256: 889cfc2fd0afa9ea114d6666204c6ce0548d0aae2cba345827d317498c4c06bc
font_02_sfnt_off00007d7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D7F 19392 bytes
SHA-256: 1d62377b61d12158e480e53db837d48a08e9d4c25ae2e11f720ba2bfe69fd7be

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