Malicious PDF — malware analysis report

Static analysis result for SHA-256 b368d72fde865a39…

MALICIOUS

PDF

36.7 KB Created: 2021-05-24 21:11:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 98f6e28cda9da35459af5e19413805d0 SHA-1: c49c42f6b0db90126940dce6edcbadc52adb5d32 SHA-256: b368d72fde865a3931d7ded727b9a2e2cde336e2d83c195d49be32ae51e66a8b
160 Risk Score

Malware Insights

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

The PDF contains multiple links to known malicious redirectors, disguised as "free generator" or "game hack" lures. The document body and embedded links suggest a phishing attempt to trick users into visiting malicious sites, likely to download further malware or engage in scams. No scripts were extracted, but the PDF structure and embedded links are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9447

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/apps-to-get-free-robux-game-hack In PDF document text
    • http://zercalo.org/images/is-minecraft-free-on-switch_GM479516143.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/how-to-download-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • http://zercalo.org/images/roblox-top_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00003326.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3326 25348 bytes
SHA-256: 86d47e2a0077772f9c302d6569234aa43c58e25a342a79ada419fdb41d2a7816
font_01_sfnt_off00006e0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E0A 18292 bytes
SHA-256: b4e5860ebf2343f9b18b94d86a305cbc7e8ebd2f2a6bfe7ceeed88b67548d8bf

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