Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7a3fa457da29532…

MALICIOUS

PDF

39.6 KB Created: 2021-05-14 00:32:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 53ea5d66fc690a4e17b2fbfae81dbe7a SHA-1: 03a13921133278cf20fb49be9ce4e8bf09dd1bac SHA-256: b7a3fa457da2953216b4b4039c7c3edd719c7a06f8a183eae0c638d2e5029687
130 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a game hack redirect lure, pointing to a malicious URL. This URL is presented as a way to access a 'Coin Master Daily Free Spins Link App' and likely serves to download a second-stage payload. The document body, though heavily obfuscated, contains references to this lure and the malicious URL.

Machine Learning

  • Nyx PDF Classifier clean score 0.0334

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-daily-free-spins-link-app-game-hack In PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000356f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x356F 31324 bytes
SHA-256: 03dce05e6f416190b1c24fc3544b777a3db13240f2549d315f9b47af8e6b8d22
font_01_sfnt_off00007921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7921 18476 bytes
SHA-256: 8af254e049fcccc1442405a550d0e3ce0b782d3872c3c9d4c1baf9e82e1cff79

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