Malicious PDF — malware analysis report

Static analysis result for SHA-256 7aa379efd2465473…

MALICIOUS

PDF

35.3 KB Created: 2021-07-05 15:05:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 2b537f3035808b1b47bc3470bbf50ef4 SHA-1: e5f68ba2908505b2952e7053a7bbfb4a3f2f4927 SHA-256: 7aa379efd2465473ccfda7868cdcac7721530b8070d7cb8a1a7451a54d3acd07
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirectors and pages offering game hacks and generators, indicating a lure for users to download potentially malicious content or visit phishing sites. The ML classifier strongly flagged this PDF as malicious, and heuristics confirm the presence of redirector links and a download button lure. No scripts were extracted, but the document structure and embedded URLs suggest a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • PRC/3D content in PDF medium CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • 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/roblox-images-game-hack In PDF document text
    • http://www.repion.com/uploaded_files/userfiles/files/free-robux-legally-no-offers-no-verification_GM431946152.pdfIn PDF document text
    • http://www.repion.com/uploaded_files/userfiles/files/tiktok-free-views_GM835599320.pdfIn PDF document text
    • http://www.repion.com/uploaded_files/userfiles/files/free-roblox-stuff-2021-promo-codes_GM431946152.pdfIn PDF document text
    • http://www.repion.com/uploaded_files/userfiles/files/roblox-hack-clients-jailbreak_GM431946152.pdfIn PDF document text
    • http://www.repion.com/uploaded_files/userfiles/files/how-to-get-free-faces-from-events-roblox_GM431946152.pdfIn PDF document text
    • http://www.repion.com/uploaded_files/userfiles/files/how-to-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
    • http://www.repion.com/uploaded_files/userfiles/files/coin-master-hack-online-generator-without-human-verification_GM406889139.pdfIn PDF document text
    • http://www.repion.com/uploaded_files/userfiles/files/este-hack-de-robux_GM431946152.pdfIn PDF document text
    • http://www.repion.com/uploaded_files/userfiles/files/coin-master-cards-hack_GM406889139.pdfIn PDF document text
    • http://www.repion.com/uploaded_files/userfiles/files/roblox-updated-hack-com_GM431946152.pdfIn PDF document text
    • http://www.repion.com/uploaded_files/userfiles/files/claimrobux-net_GM431946152.pdfIn PDF document text
    • http://www.repion.com/uploaded_files/userfiles/files/free-spins-on-coin-master-links-2021_GM406889139.pdfIn PDF document text
    • http://www.repion.com/uploaded_files/userfiles/files/get-free-tiktok-followers_GM835599320.pdfIn PDF document text
    • http://www.repion.com/uploaded_files/userfiles/files/roblox-jailbreak-mobile-cheat_GM431946152.pdfIn PDF document text
    • http://www.repion.com/uploaded_files/userfiles/files/is-minecraft-education-edition-free_GM479516143.pdfIn PDF document text
    • http://www.repion.com/uploaded_files/userfiles/files/coin-master-free-spins-and-free-coins_GM406889139.pdfIn PDF document text
    • http://www.repion.com/uploaded_files/userfiles/files/roblox-free-character-maker_GM431946152.pdfIn PDF document text
    • http://www.repion.com/uploaded_files/userfiles/files/free-roblox-codes-that-work_GM431946152.pdfIn PDF document text
    • http://www.repion.com/uploaded_files/userfiles/files/get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://www.repion.com/uploaded_files/userfiles/files/free-robux-codes-2021_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_off0000343b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x343B 22284 bytes
SHA-256: a3a9e8941a68049c5422c7257c3b4e39a8c217c54401153c0f4488888a76c0e3
font_01_sfnt_off000065dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65DC 18748 bytes
SHA-256: bf47317ac3eb75c41d6e114fad8eb749f701cb38c6048cbe79b2f4a9a3dcbfc0

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