Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5b62888c8a527fa…

MALICIOUS

PDF

37.3 KB Created: 2021-05-16 03:30:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 2fe6a2bedfba3cf1459515724c092c45 SHA-1: 4ae61e35d942ca3b0443d8dd40ab4b6a479abd09 SHA-256: b5b62888c8a527fac232a32daa3ea165f44aa1685573ac1d6c0594f648932559
170 Risk Score

Malware Insights

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

The PDF document contains a lure for free game currency, presenting a fake CAPTCHA to trick users into clicking a malicious link. This link redirects to known malicious infrastructure, indicating a phishing or scam attempt. No scripts were extracted, but the document structure and embedded links strongly suggest a social engineering attack.

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/can-you-get-free-robux-on-roblox-game-hack In PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000031ff.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31FF 26300 bytes
SHA-256: ac8de096c623ee1f51618c4c8a666ef9793379f314ce039bab71a4b912399423
font_01_sfnt_off00006fa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FA1 18580 bytes
SHA-256: 0d0c29456045ba8700eeeb9b5d08ef238a74b3c73615dbb1a220be23830403a6

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