Malicious PDF — malware analysis report

Static analysis result for SHA-256 53d85d18cfdc4f66…

MALICIOUS

PDF

40.8 KB Created: 2021-05-16 02:33:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 3eaa1a174df8416fca06cc611cd073aa SHA-1: a1142f83876fb00125b443ed30db7616f5187872 SHA-256: 53d85d18cfdc4f6639e6a1fc05e2765cdc360d0cc6debdd1dde7d8248ec10cf2
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 pointing to a "free generator / game hack" lure. The embedded URL, https://netcdn.xyz/app/431946152/free-robux-images-game-hack, is associated with malicious redirector infrastructure. The document body also contains similar text and links, reinforcing the lure. No scripts were extracted, but the primary attack vector appears to be a social engineering lure leading to malicious content.

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-images-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_off00003669.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3669 25692 bytes
SHA-256: ce4355c88660511e451b9d666eef45e794bf21c0c1f4225764817f69d3ca1f99
font_01_sfnt_off0000722d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x722D 2944 bytes
SHA-256: cd6b7c2ccfe71f2727c1a6ef525dd8975ce138e7022f07d8f7690d83125878d5
font_02_sfnt_off00007c58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C58 18792 bytes
SHA-256: a2580c58451f3b1d88c8ceab1016c43f7244c9e681afad5968b7c22bbe0132ae

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