Malicious PDF — malware analysis report

Static analysis result for SHA-256 66551ce45913484e…

MALICIOUS

PDF

36.0 KB Created: 2021-05-22 07:43:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: f05a923dd94e8a46e8c73bbb2c7055a3 SHA-1: 787fbaec19b1668791e6c05c0a54d3c7d7876aa4 SHA-256: 66551ce45913484ee0fe5ae0641a9ec19def31e352318eb58c99c9d39484c43f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links that redirect to malicious infrastructure, specifically promoting 'free generators' or 'game hacks' for popular games. The document body and heuristics indicate a lure designed to trick users into clicking these links, likely leading to further malware downloads or phishing attempts. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9648

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/free-coin-master-spins-link-game-hack In PDF document text
    • https://cluster-consulting.com/images/free-robux-without-survey_GM431946152.pdfIn PDF document text
    • https://cluster-consulting.com/images/coin-master-heaven-free-spins-today_GM406889139.pdfIn PDF document text
    • https://cluster-consulting.com/images/free-robux-hacks-no-verification_GM431946152.pdfIn PDF document text
    • https://cluster-consulting.com/images/how-to-get-more-robux_GM431946152.pdfIn PDF document text
    • https://cluster-consulting.com/images/free-tiktok-followers-without-verification_GM835599320.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off000030c7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x30C7 25804 bytes
SHA-256: 21cee9026bcdb44a8858179d2c9151d4a1cce2a861ec8296a89e94275c87ad22
font_01_sfnt_off00006c31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C31 18056 bytes
SHA-256: 3a13f115a00b8b7b194300b8b076c3bf70984f89fe406390bc378e2507b22e35

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