Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dc679d9ef828b6d…

MALICIOUS

PDF

40.0 KB Created: 2021-05-14 13:35:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 4d8aea1b2b3e71c6fc32264e7edb7128 SHA-1: 0552a0badd72f436ab9a3c496e125542810d5511 SHA-256: 6dc679d9ef828b6d851e6362267a850be1a3906ea6fa54642eb638cd10c44ef3
170 Risk Score

Malware Insights

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

The PDF document displays a fake CAPTCHA, a common social engineering tactic to coerce users into interacting with malicious content. It contains a link to a known malicious redirector infrastructure, which ultimately leads to a site promising game hacks and virtual currency. This suggests the document is designed to lure users into potentially harmful websites, likely for further exploitation or credential harvesting.

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/op-rewards-free-robux-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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00003148.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3148 25568 bytes
SHA-256: c304818cbd1546274f0168f56dc727ce8e6f7c4c45f5a1591efbb2ebf51acb1e
font_01_sfnt_off00006c34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C34 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off00007945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7945 18756 bytes
SHA-256: 060429e30aee9ae32e68a5a96a6a224aa27ea33c727993be362f9dfde6d66d3f

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