Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad2d6c0c56342842…

MALICIOUS

PDF

43.4 KB Created: 2021-05-12 06:16:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: e8cd6f1a31f25718c8d7dc4dda9eeb3b SHA-1: 41c61289af6543f08028bae5f36161f8cb570b83 SHA-256: ad2d6c0c56342842c9dcac505a4ca0fdde75f49dac3c0c78935805330daa135d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links, including one identified as a malicious redirector, leading to a lure for game hacks and free currency. The document body and embedded links suggest a phishing attempt to trick users into visiting potentially harmful websites. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a social engineering attack.

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/what-games-on-roblox-give-you-free-robux-game-hack In PDF document text
    • http://www.gzsuihe.com/Public/upload/editorfiles/coin-master-computer-hack_GM406889139.pdfIn PDF document text
    • http://www.gzsuihe.com/Public/upload/editorfiles/coin-master-free-spin-daily-link_GM406889139.pdfIn PDF document text
    • http://www.gzsuihe.com/Public/upload/editorfiles/how-to-get-free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • http://www.gzsuihe.com/Public/upload/editorfiles/daily-coin-master-free-spin-apk_GM406889139.pdfIn PDF document text
    • http://www.gzsuihe.com/Public/upload/editorfiles/2021-coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://www.gzsuihe.com/Public/upload/editorfiles/download-coin-master-apk-hack_GM406889139.pdfIn PDF document text
    • http://www.gzsuihe.com/Public/upload/editorfiles/real-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://www.gzsuihe.com/Public/upload/editorfiles/free-roblox-svg_GM431946152.pdfIn PDF document text
    • http://www.gzsuihe.com/Public/upload/editorfiles/free-robux-generator-without-human-verification_GM431946152.pdfIn PDF document text
    • http://www.gzsuihe.com/Public/upload/editorfiles/roblox-free-pets_GM431946152.pdfIn PDF document text
    • http://www.gzsuihe.com/Public/upload/editorfiles/free-spins-coin-master-links-blogspot_GM406889139.pdfIn PDF document text
    • http://www.gzsuihe.com/Public/upload/editorfiles/best-free-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • http://www.gzsuihe.com/Public/upload/editorfiles/coin-mast-hacks_GM406889139.pdfIn PDF document text
    • http://www.gzsuihe.com/Public/upload/editorfiles/coin-master-daily-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://www.gzsuihe.com/Public/upload/editorfiles/free-rare-cards-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.gzsuihe.com/Public/upload/editorfiles/roblox-rules_GM431946152.pdfIn PDF document text
    • http://www.gzsuihe.com/Public/upload/editorfiles/coin-master-free-spins-activegamer_GM406889139.pdfIn PDF document text
    • http://www.gzsuihe.com/Public/upload/editorfiles/tryrbx-site-free-robux_GM431946152.pdfIn PDF document text
    • http://www.gzsuihe.com/Public/upload/editorfiles/play-coin-master-online-free_GM406889139.pdfIn PDF document text
    • http://www.gzsuihe.com/Public/upload/editorfiles/free-links-to-coin-master_GM406889139.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_off00004b40.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B40 24636 bytes
SHA-256: c525d477bf60e514ba8573b91068800397f314b4d3d4e1c1b1476989d1c380fd
font_01_sfnt_off000083ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83EE 19440 bytes
SHA-256: d075b9cdfa29af0d09f3a3e5cc134cf400d7d34255e3ca0094b6ab529e7e4150

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