Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b79441d4ffc9547…

MALICIOUS

PDF

43.9 KB Created: 2021-05-11 08:32:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: d859a4a0172f7f2d05104c6119fab42e SHA-1: 53661eb0e8158e98cc1bc1ca9d9c97bea51b46c0 SHA-256: 8b79441d4ffc95473d41556f2b8d662bd2f3fc7b40f69e6a4527cb0167cef8fb
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to websites offering 'free Robux' or game hacks, a common lure for malicious activity. The ML classifier also flagged this PDF as malicious. The document body and embedded URLs suggest a phishing or scam attempt designed to lead users to potentially harmful content.

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/roblox-studio-free-robux-game-hack In PDF document text
    • http://iacfhouston.com/images/coin-master-hack-apk-35-11_GM406889139.pdfIn PDF document text
    • http://iacfhouston.com/images/earn-robux_GM431946152.pdfIn PDF document text
    • http://iacfhouston.com/images/free-robux-2021_GM431946152.pdfIn PDF document text
    • http://iacfhouston.com/images/free-robux-instantly_GM431946152.pdfIn PDF document text
    • http://iacfhouston.com/images/minecraft-build-hacks_GM479516143.pdfIn PDF document text
    • http://iacfhouston.com/images/coin-master-hack-mod-game-download_GM406889139.pdfIn PDF document text
    • http://iacfhouston.com/images/free-robux-not-fake_GM431946152.pdfIn PDF document text
    • http://iacfhouston.com/images/coin-master-free-link-today_GM406889139.pdfIn PDF document text
    • http://iacfhouston.com/images/www-roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://iacfhouston.com/images/free-coin-master-s_GM406889139.pdfIn PDF document text
    • http://iacfhouston.com/images/minecraft-coins-free_GM479516143.pdfIn PDF document text
    • http://iacfhouston.com/images/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://iacfhouston.com/images/free-robux-generator-2021-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://iacfhouston.com/images/free-spin-coin-master-game_GM406889139.pdfIn PDF document text
    • http://iacfhouston.com/images/coin-master-free-spins-uk_GM406889139.pdfIn PDF document text
    • http://iacfhouston.com/images/coin-master-free-spins-link-whatsapp-group_GM406889139.pdfIn PDF document text
    • http://iacfhouston.com/images/freerobuxhack-us_GM431946152.pdfIn PDF document text
    • http://iacfhouston.com/images/what-are-points-for-in-roblox_GM431946152.pdfIn PDF document text
    • http://iacfhouston.com/images/oprewards-com-roblox_GM431946152.pdfIn PDF document text
    • http://iacfhouston.com/images/how-to-hack-any-roblox-account_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_003_off00004945.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4945 27692 bytes
SHA-256: b92d601f5912af1c2074c5da737ccbcc23f30b41547927475f01a6602ad5828c
font_01_sfnt_off0000889f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x889F 18484 bytes
SHA-256: 5fdc582f30145a96e28329e80bd45567e2bf6a1df475cf6931e13f95db6331fe

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