Malicious PDF — malware analysis report

Static analysis result for SHA-256 199133c75b36907b…

MALICIOUS

PDF

37.4 KB Created: 2021-05-14 00:32:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 59f1768b40809b9ccb40edfce1835d41 SHA-1: 08dd9ed69374b60e317a1ed2ece4a92bd2b2ce8e SHA-256: 199133c75b36907bf11a097ef59b3b0d92913df6d2e0f854074f354728230d6e
130 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a game hack redirector lure, pointing to malicious infrastructure. The document body and embedded artifacts also contain references to the malicious URL. The primary intent appears to be directing users to a malicious site, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier clean score 0.0334

Heuristics 4

  • 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.
  • 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/www-roblox-com-robux-free-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_off00003364.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3364 26176 bytes
SHA-256: d4b1f1a65208a2c3bbd49cca8b39dffb017063cbfdd5960ac35b061fbad0ee73
font_01_sfnt_off00006fb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FB0 18708 bytes
SHA-256: c91f27fd30ec200e2a0dbd5cc88ad35776bc2371b1b59549651737de5f7a4295

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