Malicious PDF — malware analysis report

Static analysis result for SHA-256 878faecd6f22c5e4…

MALICIOUS

PDF

38.1 KB Created: 2021-05-22 02:40:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: d03cecacaa1ea6217a7d30ff54347604 SHA-1: 81a051ae60a2ee52807f95005a5f7734e20459a6 SHA-256: 878faecd6f22c5e4a91b591684a269cd35e9b2e71062a2e14aab551b72785b51
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple links to known malicious redirectors, disguised as free game hacks and generators. The ML classifier also flagged the document as malicious. The primary lure appears to be a 'free generator' for Minecraft, directing users to the malicious URL https://netcdn.xyz/app/479516143/minecraft-games-free-download-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to exploit vulnerabilities or trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9407

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-games-free-download-game-hack In PDF document text
    • http://mbbs.hr/files/how-to-get-free-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/free-bedrock-minecraft_GM479516143.pdfIn PDF document text
    • http://mbbs.hr/files/how-to-get-a-cape-in-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://mbbs.hr/files/how-to-get-free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/roblox-robux-hack_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_002_off00003241.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3241 28496 bytes
SHA-256: 5c377273c5639418c1a3b22500559910a2c2030a7f2c6f28868cd5a3f4600b5c
font_01_sfnt_off000072ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72EA 18548 bytes
SHA-256: ca1316f27781c6024a610b7b161693a7a162d40ad3e3bb281154e4fcfa7f8f80

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