Malicious PDF — malware analysis report

Static analysis result for SHA-256 59854f07ceda42d5…

MALICIOUS

PDF

43.7 KB Created: 2021-05-10 16:32:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 849f917f6e91397734615e7935b96d90 SHA-1: 688b3a0f8f439512f52ab27bc1f5318b585b637b SHA-256: 59854f07ceda42d5a0f0335d69be5eb9fbad0e744dc0de1708402bf46908c75f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to malicious infrastructure, specifically advertising free Robux and game hacks. The ML classifier also flagged this PDF as malicious. The presence of these links and the lure content strongly suggest a phishing or scam attempt designed to lead users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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/free-robux-download-game-hack In PDF document text
    • http://optom.co.nz/images/daily-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://optom.co.nz/images/free-robux-group-payouts_GM431946152.pdfIn PDF document text
    • http://optom.co.nz/images/free-robux-games_GM431946152.pdfIn PDF document text
    • http://optom.co.nz/images/free-roblox-clothes-codes_GM431946152.pdfIn PDF document text
    • http://optom.co.nz/images/free-robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • http://optom.co.nz/images/free-spins-and-coins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://optom.co.nz/images/free-roblox-adopt-me-pets_GM431946152.pdfIn PDF document text
    • http://optom.co.nz/images/free-coins-and-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://optom.co.nz/images/pig-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://optom.co.nz/images/minecraft-free-download-linux_GM479516143.pdfIn PDF document text
    • http://optom.co.nz/images/how-to-make-free-robux_GM431946152.pdfIn PDF document text
    • http://optom.co.nz/images/microsoft-bing-free-robux_GM431946152.pdfIn PDF document text
    • http://optom.co.nz/images/free-robux-games-that-actually-work_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00003d36.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3D36 28188 bytes
SHA-256: 0b5d7ea2d49401beabc363368b140a9b32e4648748940c1169578b4bf6a0af8e
font_01_sfnt_off00007d60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D60 2820 bytes
SHA-256: 96a70491b0783ad8c6fc9b11a18f021aa22c69ac41ee4499b781d16a1b99b689
font_02_sfnt_off00008700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8700 18824 bytes
SHA-256: 8406cb1c38774726d91b6a9fb5333918f35ff34bd7dcb56cd5a50b6af28a82ee

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