Malicious PDF — malware analysis report

Static analysis result for SHA-256 86438a3cce925a55…

MALICIOUS

PDF

44.7 KB Created: 2021-05-19 23:30:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: fef130cf0986c02dff3678ed8bc6af99 SHA-1: 934e8d061cf7e168bad2c0e44100292f46058160 SHA-256: 86438a3cce925a55718afa50d2d7dfeebb7ddaac44202f16741ba1c76e800ddf
170 Risk Score

Malware Insights

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

The PDF document contains multiple links pointing to a known malicious redirector infrastructure, specifically advertising a 'free Robux generator' and a 'game hack'. It also displays a fake CAPTCHA or human verification prompt to trick users into interacting with the malicious link. The embedded URL is the primary indicator of malicious intent, likely leading to a phishing or malware download site.

Machine Learning

  • Nyx PDF Classifier clean score 0.0115

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/free-robux-generator-no-verification-game-hack In PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000034d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x34D6 25780 bytes
SHA-256: 0ee01749a26ee9878429bf7eb5f2c80f2fda4aed44a57edc0fb01d45e5c3675a
font_01_sfnt_off00006ff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FF8 2820 bytes
SHA-256: 972979c3a46100cf5f8fd289bc6fbd2496ff75fec0e3f6753648c72ec6eba714
font_02_sfnt_off00007993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7993 7604 bytes
SHA-256: b4393b16e2c096a269897d1c45a543fc9365713fd2329df9b91235200715c508
font_03_sfnt_off00008c02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C02 18600 bytes
SHA-256: fd611ad94f1c5362e5936d61a0ca6686a852f181e3b69dadbb107f1a26b259f7

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