Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4ce220dbbcdf451…

MALICIOUS

PDF

43.7 KB Created: 2021-05-14 14:37:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 519e211ffdcf57232f1ce1a0591e6790 SHA-1: 13be6961c1c33d1915a660275b6a4973dac3d904 SHA-256: c4ce220dbbcdf4510990cf16d1fb28b10b2fcf1e2de7bf805fafc67b470574c4
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one that redirects to a 'free generator / game hack' lure. This link, https://netcdn.xyz/app/431946152/get-robux-for-free-2021-game-hack, is flagged as malicious and part of a redirector infrastructure. The document's content and heuristics strongly suggest a social engineering attempt to trick users into visiting malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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/431946152/get-robux-for-free-2021-game-hack In PDF document text
    • https://www.chorwacjaapartamenty.com/images/coin-master-free-spins-today-daily-links_GM406889139.pdfIn PDF document text
    • https://www.chorwacjaapartamenty.com/images/free-coin-master-game_GM406889139.pdfIn PDF document text
    • https://www.chorwacjaapartamenty.com/images/coin-master-hacker-club_GM406889139.pdfIn PDF document text
    • https://www.chorwacjaapartamenty.com/images/earn-robux-sites_GM431946152.pdfIn PDF document text
    • https://www.chorwacjaapartamenty.com/images/static-moonactive_GM406889139.pdfIn PDF document text
    • https://www.chorwacjaapartamenty.com/images/roblox-skin-free_GM431946152.pdfIn PDF document text
    • https://www.chorwacjaapartamenty.com/images/coin-master-free-spins-link-app-download_GM406889139.pdfIn PDF document text
    • https://www.chorwacjaapartamenty.com/images/free-robux-android_GM431946152.pdfIn PDF document text
    • https://www.chorwacjaapartamenty.com/images/robux-free-promo-codes_GM431946152.pdfIn PDF document text
    • https://www.chorwacjaapartamenty.com/images/free-robux-that-actually-works-2021_GM431946152.pdfIn PDF document text
    • https://www.chorwacjaapartamenty.com/images/coin-master-hack-ios-download-2021_GM406889139.pdfIn PDF document text
    • https://www.chorwacjaapartamenty.com/images/free-coin-master-hacks_GM406889139.pdfIn PDF document text
    • https://www.chorwacjaapartamenty.com/images/free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.chorwacjaapartamenty.com/images/roblox-free-robux_GM431946152.pdfIn PDF document text
    • https://www.chorwacjaapartamenty.com/images/hacker-minecraft-song_GM479516143.pdfIn PDF document text
    • https://www.chorwacjaapartamenty.com/images/rbx-website_GM431946152.pdfIn PDF document text
    • https://www.chorwacjaapartamenty.com/images/free-robux-group_GM431946152.pdfIn PDF document text
    • https://www.chorwacjaapartamenty.com/images/free-coin-master-spins-hack_GM406889139.pdfIn PDF document text
    • https://www.chorwacjaapartamenty.com/images/coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • https://www.chorwacjaapartamenty.com/images/free-roblox-accounts-with-robux-that-work-not-banned-2021_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004db0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4DB0 25508 bytes
SHA-256: dd2e6cc51ae871177ec54ec7146701f2d9910700d8b9656676de48f0136b50ef
font_01_sfnt_off000087d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87D8 18520 bytes
SHA-256: e088d92b388561e3a46dc194d915539325ab46261f90c1147848fe102ee4ee2d

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