Malicious PDF — malware analysis report

Static analysis result for SHA-256 0eaf3299212d6323…

MALICIOUS

PDF

38.4 KB Created: 2021-05-19 10:38:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: d7278da22c49289d8ca3865c4dcaa2ec SHA-1: 4b0b7986b6b1f193bf2c4e82564b43c6709f25d2 SHA-256: 0eaf3299212d6323962aac9f33cc8f6f9e5aad9b93750d2e5203329dedccfbde
130 Risk Score

Malware Insights

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

The PDF contains multiple links to a known malicious redirector infrastructure, specifically advertising a 'Coin Master Free Stuff Game Hack'. The document body and heuristics indicate a lure to trick users into clicking the malicious link, likely to download a second-stage payload. The presence of a call-to-action button further supports this malicious workflow.

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-stuff-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_off000033fc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x33FC 24552 bytes
SHA-256: 87c2a8a43b74bcf0fc498a6dd0531567a14ad293bb7ee33ed64dc0e934aacdad
font_01_sfnt_off00006c0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C0D 2880 bytes
SHA-256: 29ffac6ae2c225ad742d302df2deaca7764d0abb58a6f2c81d3137a4f416ba07
font_02_sfnt_off000075fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75FB 17848 bytes
SHA-256: 49970788d519349fbd5ba6badf06c324563f4794a9a5c1e41d0627a31815ac32

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