Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebb90bde4853b05d…

MALICIOUS

PDF

38.1 KB Created: 2021-05-12 23:13:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: e591565b5dfb8676d78e0dc658fd9cd6 SHA-1: d541fbabf5e76c7743ccca7034b3216cc9957af0 SHA-256: ebb90bde4853b05d2c056acf1cddc743fb9466bcb32139df2375e7e2d1570f6a
170 Risk Score

Malware Insights

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

The PDF document contains a malicious link disguised as a "Robux Hacks 2021" generator, which is a common lure for tricking users into visiting malicious websites. The heuristic firings indicate a fake CAPTCHA and a malicious redirector link, strongly suggesting a phishing or scam attempt. The document body explicitly mentions "Robux Hacks 2021" and "CLICK HERE TO ACCESS ROBLOX GENERATOR", reinforcing the social engineering aspect.

Machine Learning

  • Nyx PDF Classifier clean score 0.0334

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/robux-hacks-2021-game-hack In PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 7

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000357a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x357A 25768 bytes
SHA-256: a22f6f3933bc8a79bca54debdf8bf690ec37995d82976334fb861d1490ad9b73
font_01_sfnt_off0000722f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x722F 18648 bytes
SHA-256: 03ab0df94635c5ebeb05191dd2fda9aa410ed650044dc459735f8f7cc99ee4ee

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