Malicious PDF — malware analysis report

Static analysis result for SHA-256 c18b272fb7ad19ba…

MALICIOUS

PDF

37.6 KB Created: 2021-05-21 19:00:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 52826a4d00c43365cac9c58c2fac0c06 SHA-1: bad0ad3de5ccc934b54e822e6e8c2d8d3adddc0b SHA-256: c18b272fb7ad19ba6e2ef7387ca6aad3dd5a74a6857c0a75bf4404fc4ccb49bf
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a critical heuristic firing for a redirector link, pointing to 'free-roblox-gfx-game-hack'. The document body also contains the same URL and a call-to-action phrase. This indicates a social engineering lure designed to trick users into visiting malicious infrastructure, likely to download further malware or engage in phishing. No scripts were extracted, but the primary attack vector is the malicious link.

Machine Learning

  • Nyx PDF Classifier clean score 0.0076

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/free-roblox-gfx-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
font_00_sfnt_off00002f4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F4A 24704 bytes
SHA-256: 22a8199eb7783920ff8b3199a32b66bece19ae3c5ef73654d7f816c9c90f60a7
font_01_sfnt_off0000685a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x685A 2948 bytes
SHA-256: 93a0050dbecb7f1fb28abf75b9ffb9ca29387d07e79fc257b47c0f272946df5e
font_02_sfnt_off00007290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7290 17948 bytes
SHA-256: edf37cea4d9572b79aff99b5f3e3e51e81091579a2693570fa47b81a4934fab1

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