Malicious PDF — malware analysis report

Static analysis result for SHA-256 37414040de6cea01…

MALICIOUS

PDF

42.6 KB Created: 2021-05-14 08:55:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: a4360586a4c530d1a4ccf67193c4b7bb SHA-1: 79081ad844356068c54a36894442924efe23d95a SHA-256: 37414040de6cea01b0902fd65a6371ac689d0f449e4b609c83165ea4acc79449
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, including a known malicious redirector at `https://netcdn.xyz/app/406889139/free-spin-links-coin-master-2021-game-hack`. These links are presented as lures for game hacks and generators, indicating a social engineering tactic to drive traffic to potentially malicious sites. The presence of embedded URLs and the ML classifier's high confidence score support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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-spin-links-coin-master-2021-game-hack In PDF document text
    • http://www.vktzunami.cz/images/roblox-generator_GM431946152.pdfIn PDF document text
    • http://www.vktzunami.cz/images/daily-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.vktzunami.cz/images/coin-master-free-spins-no-human-verification_GM406889139.pdfIn PDF document text
    • http://www.vktzunami.cz/images/coin-master-free-spin-ml_GM406889139.pdfIn PDF document text
    • http://www.vktzunami.cz/images/coin-master-apk-hack-2021_GM406889139.pdfIn PDF document text
    • http://www.vktzunami.cz/images/free-spins-on-coin-masters_GM406889139.pdfIn PDF document text
    • http://www.vktzunami.cz/images/haktuts-coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://www.vktzunami.cz/images/earn-free-robux-for-roblox_GM431946152.pdfIn PDF document text
    • http://www.vktzunami.cz/images/free-multiplayer-minecraft-server_GM479516143.pdfIn PDF document text
    • http://www.vktzunami.cz/images/withdraw-robux_GM431946152.pdfIn PDF document text
    • http://www.vktzunami.cz/images/claimrbx-free-robux_GM431946152.pdfIn PDF document text
    • http://www.vktzunami.cz/images/coin-master-32-hack-apk-download_GM406889139.pdfIn PDF document text
    • http://www.vktzunami.cz/images/coin-master-cards_GM406889139.pdfIn PDF document text
    • http://www.vktzunami.cz/images/how-to-make-robux_GM431946152.pdfIn PDF document text
    • http://www.vktzunami.cz/images/coin-master-download_GM406889139.pdfIn PDF document text
    • http://www.vktzunami.cz/images/free-robux-no-offers_GM431946152.pdfIn PDF document text
    • http://www.vktzunami.cz/images/to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.vktzunami.cz/images/minecraft-diamond-finder-hack_GM479516143.pdfIn PDF document text
    • http://www.vktzunami.cz/images/update-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.vktzunami.cz/images/free-robux-no-verify_GM431946152.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_003_off00004779.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4779 25596 bytes
SHA-256: 39dbb235459c8e34ab6763858cf9b4f4decacee96b4e4c2d1229f5bc57bff100
font_01_sfnt_off00008395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8395 18456 bytes
SHA-256: 2e3762c92aff24b7380dbd76867989e398d3e3dfa703baf994bdeb02abf23f5b

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