Malicious PDF — malware analysis report

Static analysis result for SHA-256 b51e9f97451e80a9…

MALICIOUS

PDF

39.9 KB Created: 2021-05-18 00:46:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 93f2af3de9eebe0e9c33b0f2a7a700b6 SHA-1: 237404f51a4501bf2675c0b143b369ca950f1dfd SHA-256: b51e9f97451e80a91f192278f0cc7da13f4d2d5ccfa4544f6ce203c99920846e
130 Risk Score

Malware Insights

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

The PDF document contains a lure for a 'free generator / game hack' which links to known malicious redirector infrastructure. The embedded URL, https://netcdn.xyz/app/431946152/free-robux-cards-game-hack, is identified as a malicious redirector. This suggests the document's primary purpose is to trick users into visiting this malicious site, likely as a step in a phishing or malware distribution chain.

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/free-robux-cards-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_off00003507.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3507 25464 bytes
SHA-256: 2533f2fe02a5dfe4dff095e63b4f0bfe4691153a95b451a2325a3e3146a4c424
font_01_sfnt_off00007066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7066 2824 bytes
SHA-256: 45bf821f81e84f4aa8d8374f492b182b36404f38b462c7dc471deaad6ab5c104
font_02_sfnt_off00007a13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A13 18416 bytes
SHA-256: 79c56a0f23d4fc34690a575a065be14b64911c3c5a3331038291264b4b7107af

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