Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ea7bbf00b8382e3…

MALICIOUS

PDF

33.9 KB Created: 2021-07-04 18:10:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 8ac37336a53673d9769994a3728388a2 SHA-1: b0cc805bd96b2fe8ddab2a3ae2cf2ee3afc3adc7 SHA-256: 7ea7bbf00b8382e3f6b5ccbd18a494ccfd8be0b1365fddafbb1a4e848c9646b5
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one identified as a malicious redirector, designed to lure users into clicking on offers for free game currency or hacks. The primary malicious link, http://netcdn.tw/app/431946152/how-to-get-free-robux-website-game-hack, is part of a campaign distributing links to various game-related cheats and generators. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a social engineering tactic to drive traffic to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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/how-to-get-free-robux-website-game-hack In PDF document text
    • https://vierabyragazze.com/upload/files/roblox-rewards-site_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/free-spins-on-coin-master-link_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/free-robux-videos_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/how-to-hack-coin-master-android_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/roblox-cheat-phantom-forces_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/free-private-minecraft-server_GM479516143.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/how-to-hack-in-roblox-treasure-hunt-simulator_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/coin-master-website_GM406889139.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/free-robux-for-kids-no-verification_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/free-roblox-hair-to-wear_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/roblox-hack-download-deutsch_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/free-minecraft-wallpaper_GM479516143.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/get-robux-today_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/how-to-get-2021-robux-for-free_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/is-there-any-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/client-cheat-roblox_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/free-robux-generator-without-verification_GM431946152.pdfIn PDF document text
    • https://vierabyragazze.com/upload/files/robux-come_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
font_00_sfnt_off00002e9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E9D 21820 bytes
SHA-256: 63066932ab5d416b6d985a0b09e3421c1a67fd8e39cda120a3bd29004aa94310
font_01_sfnt_off00005e88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E88 19304 bytes
SHA-256: c93debd830b422eae21ec10a608c2d09d6fed7207bb4c45cee900aa0b721bbbd

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