Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0f44132023c25ef…

MALICIOUS

PDF

39.1 KB Created: 2021-05-10 11:42:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: c5a2ce74691d446e0c4b9976dd02c4fd SHA-1: 6295fae50c10300397f4f32ec8d97d19de09a342 SHA-256: b0f44132023c25ef290895bc185bdbabff8635d8dcc9a60c70a57802a2db2d18
130 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a redirector link, specifically disguised as a 'Coin Master Free Link Spin' and 'game hack' lure. This link, https://netcdn.xyz/app/406889139/coin-master-free-link-spin-game-hack, is known to lead to malicious infrastructure. The document body also contains similar text and a call-to-action phrase, reinforcing the social engineering aspect. While no scripts were explicitly extracted, the nature of the redirector suggests it likely leads to a further stage of malicious activity, potentially involving exploitation or further payload delivery.

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/406889139/coin-master-free-link-spin-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
stream_003_off000032f9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x32F9 25560 bytes
SHA-256: cccaea195c90971135a2706a85e105018edd1a5380f3c11f9449733c4d72fe5b
font_01_sfnt_off00006ce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CE8 3228 bytes
SHA-256: fb56570b78cc67ed6f160bccedde752e62bb12dd9edeae5515ee501d32942e96
font_02_sfnt_off00007829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7829 18056 bytes
SHA-256: 73446086b7970e4c311ea7edd0e96fe93bb69e7a29ec1c6c70349cef1a9e8050

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