Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d849ac605bff73b…

MALICIOUS

PDF

37.5 KB Created: 2021-05-15 06:00:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 59e26359f65f8e4bf8a55569066f08d0 SHA-1: c3ec2573ae3a0ea66a3ecba2b6986f58d5cb5827 SHA-256: 5d849ac605bff73b2b2fa97ca86b52daa0d1923b44430641fac3650d7b8d88ee
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a game hack lure, directing users to a suspicious URL. The document body, though heavily obfuscated, contains text related to hacking Roblox accounts and the suspicious URL. The presence of embedded URLs and the nature of the lure suggest an attempt to redirect users to a malicious site, likely for further exploitation or credential harvesting.

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/how-to-hack-roblox-accounts-for-robux-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_off0000340b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x340B 26152 bytes
SHA-256: 8a900c82a9534398614be77226aab2868c08f03a36ccc793bc8e387ca77bf30a
font_01_sfnt_off00006fdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FDF 18756 bytes
SHA-256: 937dc084e295f5db9e9abf98e8d9ece9a75bef1f1a22520950dbcf80e1ec543e

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