Malicious PDF — malware analysis report

Static analysis result for SHA-256 483840814ea4f0dd…

MALICIOUS

PDF

41.5 KB Created: 2021-05-10 11:18:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 9a43626770d771b31fc2b2d6f3714e45 SHA-1: 294ba26cc2b9d30905c0b89f404f3c8e4a2c7039 SHA-256: 483840814ea4f0dd989ae6852a7c8dd47efd021f6d5663f7449b804560d8dbfd
170 Risk Score

Malware Insights

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

The PDF document contains a lure for a Roblox game hack generator, displaying a fake CAPTCHA and a call-to-action button. It embeds a malicious URL that redirects to a known malicious infrastructure, likely to download a second-stage payload. The document's content and embedded link strongly suggest a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier clean score 0.0125

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-admin-hack-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_off000036aa.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x36AA 26372 bytes
SHA-256: e44343bb147b794330b9a5192df6367d1782f4dee81c318b6ff2c3235da06c8f
font_01_sfnt_off00007251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7251 4004 bytes
SHA-256: 2d68c5842755efcb8cc9798bd2859e380862ba8d0cf0353ce1ee3341ba408206
font_02_sfnt_off00007f7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F7D 18736 bytes
SHA-256: 3c6e42d8b899458ba5de36bc8f8a4655a2118fb63f8b9623f3d1687e7f66cf01

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