Malicious PDF — malware analysis report

Static analysis result for SHA-256 81dc0448b071b061…

MALICIOUS

PDF

36.8 KB Created: 2021-05-19 23:43:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 2a6decbc2437e557f3d44697cb182d50 SHA-1: 8ffbf8c2e959cbf451ac53e6090c94e9034f0af7 SHA-256: 81dc0448b071b0619582dfea8dd880b18042dc41282b89d49a1e0ba9f5b8f737
70 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded text and a link that strongly suggests a lure for downloading a game mod. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms that the primary URL leads to known malicious infrastructure, likely serving as a downloader or redirector to the actual malicious payload. The presence of a 'download button' heuristic further supports the phishing and social engineering aspect of this attack.

Machine Learning

  • Nyx PDF Classifier clean score 0.0292

Heuristics 3

  • 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/406889139/coin-master-3.2-mod-hack-apk-download-game-hack In 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_003_off00003298.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3298 25132 bytes
SHA-256: 26bf7fe438bd39ee7a059dd396f7efb72f56438984191015bb84093c719aa660
font_01_sfnt_off00006cb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CB3 18836 bytes
SHA-256: ff135a53a420a418677011958d681f26302d42eb767583c3b8513888fb402d9d

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