Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4e527e1552703ec…

MALICIOUS

PDF

40.6 KB Created: 2021-05-20 13:30:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 0b29de506b45a6d0a7bb5f498b9050be SHA-1: ac43899a747bfc202fb234fdcb177d89911d373a SHA-256: a4e527e1552703ec8bdce76689d3201ab5d28bf15965aaa571f5801f5b6a18cc
160 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 'Coin Master Free Spins And Coins Daily Links' and 'game hack' lures. The ML classifier also flagged the document as malicious. The embedded URLs and the document body suggest a social engineering tactic to trick users into clicking malicious links, likely leading to a phishing site or a download of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7776

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-spins-and-coins-daily-links-game-hack In PDF document text
    • https://www.sensationboats.com/images/promo-codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.sensationboats.com/images/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.sensationboats.com/images/games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://www.sensationboats.com/images/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • https://www.sensationboats.com/images/roblox-free-robux-hack_GM431946152.pdfIn 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_002_off000037bf.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x37BF 24520 bytes
SHA-256: b452364516a575e55908faa1b211e4b4a081d1b6194c41d0ec1fdbd49acda067
font_01_sfnt_off00006f78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F78 3560 bytes
SHA-256: c953d730e49f69c7d62e02a926729ae4a31de13d9a976dc4a95b39cf47066c93
font_02_sfnt_off00007bfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BFD 18652 bytes
SHA-256: e3d0f3d2cfc9c6a1690771b503077d618c720b070dec55624c93c27d11531b52

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