Malicious PDF — malware analysis report

Static analysis result for SHA-256 acb5891f2aa53b83…

MALICIOUS

PDF

36.2 KB Created: 2021-05-11 06:05:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 17f6bfaefa483cbb36ab288aa66766ae SHA-1: a9c6f8b6e11e1d00e0ee0c52058b60d827dc215f SHA-256: acb5891f2aa53b836fe628392dcd33d53f3d64ff9c69d82351238dd4759a47e8
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a critical heuristic firing for a redirector lure, specifically advertising a 'free Robux generator' for Roblox. The embedded URL, https://netcdn.xyz/app/431946152/free-robux-generator-com-roblox-hack-game-hack, is flagged as malicious. While no scripts were explicitly extracted, the PDF structure and the nature of the lure suggest an attempt to direct users to a malicious site, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier clean score 0.0302

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-generator-com-roblox-hack-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_003_off00003125.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3125 24848 bytes
SHA-256: 7f18c2e011c6a4ef26e7f0b0461e5be41b78f43e796a535de3a2efbd3069c055
font_01_sfnt_off00006aa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AA0 18852 bytes
SHA-256: 4f913a2277500713712aa6cd09c4e12b5f8093088fb24eab89a43b1b22929045