Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1030c89c3cb1143…

MALICIOUS

PDF

34.1 KB Created: 2021-06-18 15:53:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 4a0d464cc5419af4c48f163f67ae9505 SHA-1: 99c0032daa3897113bc7691f13f8612d6af9a2ea SHA-256: b1030c89c3cb1143a2f809e176b291ba49b477c1a563045356fc928358d162d2
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a high number of external links, many of which are disguised as game hack generators or free currency links. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass link farm, and the 'PDF_GAME_HACK_REDIRECT_LURE' specifically points to a lure for game-related exploits. The document body and extracted URLs reinforce this, suggesting the primary purpose is to redirect users to potentially malicious sites that may host malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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.co/app/431946152/easiest-to-download-hacks-for-roblox-game-hack PDF link annotation
    • http://zercalo.org/images/free-robux-pointsprizescom_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/free-tiktok-fans-and-likes_GM835599320.pdfIn PDF document text
    • http://zercalo.org/images/how-to-hack-peoples-on-roblox_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-free-spin-links-december-30-2021_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/how-to-get-free-gold-cards-on-coin-master_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/if-you-delete-minecraft-can-you-redownload-it-for-free_GM479516143.pdfIn PDF document text
    • http://zercalo.org/images/roblox-admin-commands-free-download_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/tower-defens-roblox-simulator-hack_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-hack-ios-cydia_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/minecraft-free-download-windows_GM479516143.pdfIn PDF document text
    • http://zercalo.org/images/free-roblox-toys-redeem-codes-2021_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/roblox-jailbreak-play-for-free_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/oprewards-hack-robux_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/minecraft-free-ios-2021_GM479516143.pdfIn PDF document text
    • http://zercalo.org/images/free-robux-real-working_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-online-free-spin_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/free-card-giver-roblox_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/free-robux-group_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-400-spin-link-hack_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/saving-pikachu-roblox-cheat_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002e6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E6F 22084 bytes
SHA-256: fa208c633f87b1881e54384c6a5c9345aa582f8e8c460f36924a0f97d02e75d1
font_01_sfnt_off00005f57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F57 19364 bytes
SHA-256: 86bc6a928b2572da348c41beda4b395040a977764a960dbf02ca37456c33aa2a

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