Malicious PDF — malware analysis report

Static analysis result for SHA-256 02dc690de359926a…

MALICIOUS

PDF

39.0 KB Created: 2021-05-10 11:33:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: f460bce16049802cc07051b2a8a91e7b SHA-1: 5b21f46cb936ab9297c71736f0d7da42f632efa4 SHA-256: 02dc690de359926ac31be9c8aa00da9262ea6c02cd5220b1c87b14641f1aa144
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple heuristics indicating it is a malicious redirector, specifically targeting users interested in 'free Robux' for Roblox. The primary malicious URL, https://netcdn.xyz/app/431946152/how-to-get-free-robux-on-roblox-2021-game-hack, is repeatedly referenced and presented as a call-to-action. While no scripts were explicitly extracted, the PDF structure and embedded content strongly suggest a social engineering lure designed to drive traffic to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier clean score 0.0128

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-on-roblox-2021-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_off00003198.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3198 24104 bytes
SHA-256: 91414f93a1e3498f61a00691f3b14462b026128c0b0f6af869e0f52bf833305c
font_01_sfnt_off00006875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6875 5596 bytes
SHA-256: 9a13c2580265a78e8a7257496a31ee0055738af7e20a5661c2902efe4bf05ce5
font_02_sfnt_off0000751d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x751D 18756 bytes
SHA-256: 57ee29ca2df633c9559bea9da81b447a7ef2e0dffb4d388bdd233aaad46b31ec

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