Malicious PDF — malware analysis report

Static analysis result for SHA-256 a35172c64754b395…

MALICIOUS

PDF

36.0 KB Created: 2021-05-21 06:59:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 9f32bbab9b58b0c25ff586c7766b017a SHA-1: 679a345d3f4d3a874ee04458be9919e5d39e803e SHA-256: a35172c64754b395060da3ca2e1963f9c8bf389c9c0ba843ee7025074a2c35f0
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, disguised as download buttons for game hacks and generators. The primary lure is for 'Minecraft Hacker Skin' and redirects to 'https://netcdn.xyz/app/479516143/minecraft-hacker-skin-game-hack'. The document body also contains numerous other links to similar lures hosted on 'hpen.gmcc-welling.com'. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9492

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/479516143/minecraft-hacker-skin-game-hack In PDF document text
    • http://hpen.gmcc-welling.com/Public/upload/editorfiles/robux-free-co_GM431946152.pdfIn PDF document text
    • http://hpen.gmcc-welling.com/Public/upload/editorfiles/is-minecraft-free_GM479516143.pdfIn PDF document text
    • http://hpen.gmcc-welling.com/Public/upload/editorfiles/real-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://hpen.gmcc-welling.com/Public/upload/editorfiles/hack-pokemon-go-free-download_GM1094591345.pdfIn PDF document text
    • http://hpen.gmcc-welling.com/Public/upload/editorfiles/hacks-for-coin-master-game_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
font_00_sfnt_off0000342d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x342D 25144 bytes
SHA-256: a0524283d3a1129b517eab3511e4f432acf92a996a522ff24525b305a9713ac1
font_01_sfnt_off00006d37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D37 17740 bytes
SHA-256: 91fe2762de83ff68ec278d498415159af7d0ffb5c1d0151dc7294afbb77550eb

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