Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5a1c10d1dc63e1f…

MALICIOUS

PDF

38.9 KB Created: 2021-05-12 21:02:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: b16f90cb02fcfa15568f69f27c58b364 SHA-1: d22f64c455c36f2ae4cceb3d326f6f772caf7a71 SHA-256: b5a1c10d1dc63e1f37cbe5892cea6dd1399a6cd7ce6217957ea58afae9665e87
170 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains multiple heuristics indicating a malicious redirector link and a fake CAPTCHA lure. The primary embedded URL, https://netcdn.xyz/app/431946152/roblox-robux-game-hack, is associated with malicious redirector infrastructure. The document body also contains text related to 'Roblox Robux' and a call to action for a generator, reinforcing the lure. The overall goal appears to be tricking the user into visiting the malicious URL under the guise of obtaining in-game currency.

Machine Learning

  • Nyx PDF Classifier clean score 0.0128

Heuristics 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/roblox-robux-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_off00003241.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3241 25748 bytes
SHA-256: d6018ddf98a0f98da8f20e428b5e215c2f91e9fc700057802b9a26b2cf91d70b
font_01_sfnt_off00006da4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DA4 2832 bytes
SHA-256: 77ae1c4cffa647a8fd533dfa4102e94364989f9e80b9cd131876e9d1005899a2
font_02_sfnt_off00007755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7755 17924 bytes
SHA-256: 85e3be4e3e2e58a235542e1db776439a3ce81e3e8a81a438b582233699a3a0dc

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