Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5d41662542625ff…

MALICIOUS

PDF

33.2 KB Created: 2021-07-20 09:54:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 945914b297ca89929868b5386bd931e4 SHA-1: 43359e90d9f81b1612de6f18a921d04b6494c54e SHA-256: e5d41662542625ff3edb4c87eaf1ad5ca3f0bac88ff1fb465692bd245506627a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to websites that are flagged as malicious redirectors, specifically advertising 'free Robux' and game hacks. The document body and embedded links reinforce this lure, suggesting an attempt to trick users into visiting potentially harmful sites. While no scripts were directly extracted, the PDF structure itself facilitates these malicious redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://netcdn.tw/app/431946152/free-robux-websites-that-actually-work-game-hack In PDF document text
    • https://kierowcyhgv.uk/images/free-likes-on-tiktok_GM835599320.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/free-minecraft-pe-server_GM479516143.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/free-robux-no-password_GM431946152.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/can-you-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/how-to-hack-peoples-roblox-accounts_GM431946152.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/claim-free-robux_GM431946152.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/free-roblox-hack_GM431946152.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/how-to-get-free-tiktok-fans-without-human-verification_GM835599320.pdfIn PDF document text
    • https://kierowcyhgv.uk/images/best-minecraft-hacked-client_GM479516143.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_off00002c1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C1D 21844 bytes
SHA-256: 16d5a1ddf25afe9d66eb9a47a1dbb4f0a17518774a4317cb19efaf3147531666
font_01_sfnt_off00005c63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C63 19440 bytes
SHA-256: 6ca5a42b15f03ce8f0527a9b99e2a0be619c538984e0635b30c2c3344ed7d0ad

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