Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e91f6c6554d46d5…

MALICIOUS

PDF

39.5 KB Created: 2021-05-16 11:43:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 0213d3f56603463993829027f470f651 SHA-1: a3ecf9c8fc4c62a0e6a9dfe4f33a3f418fc4ea14 SHA-256: 4e91f6c6554d46d5c6f7935daadad43751571199a45f50e199ccf67c74012bc6
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that masquerade as a 'Coin Master Hack' generator, directing users to a known malicious redirector. The document body explicitly contains the lure text and the malicious URL, indicating a phishing attempt to trick users into visiting a potentially harmful site. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier clean score 0.0128

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-hack-without-human-verification-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_off00003623.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3623 24488 bytes
SHA-256: 21623a18b5bb33846cf9d5a0b57cb75782a03055872fedd3fbd1d046f0c71922
font_01_sfnt_off00006e5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E5D 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off0000780e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x780E 18612 bytes
SHA-256: b6df35e58b3d03c831acea42dd002f528f3a27ace110b51459232ab570837101

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