Malicious PDF — malware analysis report

Static analysis result for SHA-256 aefb8a3f8d95e048…

MALICIOUS

PDF

38.4 KB Created: 2021-05-19 01:08:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: d99ed7f1242cc9264fe4d1b2264aa19c SHA-1: 1744f45b967c653966110f41e3d055de389f87b3 SHA-256: aefb8a3f8d95e04822707c4d8a0264c322dd1714c6e5479c8f70fe50c7ac5cfb
130 Risk Score

Malware Insights

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

The PDF file contains critical heuristic firings indicating it links to known malicious redirector infrastructure, specifically promoting a "game hack" lure. The embedded URL, https://netcdn.xyz/app/431946152/easy-robux-today-game-hack, is identified as a malicious redirector. While no scripts were explicitly extracted, the PDF structure and the nature of the lure suggest an attempt to exploit vulnerabilities or trick the user into navigating to a malicious site, likely for further payload delivery or phishing.

Machine Learning

  • Nyx PDF Classifier clean score 0.0127

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/easy-robux-today-game-hack In PDF document text
    • https://direct-link.netIn 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_off0000304d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x304D 24872 bytes
SHA-256: ebcd4310b1bba71f3e1b81b65d1b3c4f7e13d348efc697cf2fb165590e6aa7c3
font_01_sfnt_off000069ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69CE 2872 bytes
SHA-256: 7429fd8c724d021860d8bd7d7150a4246f7fb4f07a238b6edeab497bf2d4613f
font_02_sfnt_off000073ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73AC 18432 bytes
SHA-256: 1883fa622459c5988e0660fe23245856aca8d5f3a454deaddb8061927a15f0be

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