Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a54310ad6456110…

MALICIOUS

PDF

50.0 KB Created: 2021-06-07 17:37:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: ef2ee0abf4c0e68978c014e180283d19 SHA-1: 7cbe900705c5347dd387167151d2a341116558eb SHA-256: 0a54310ad6456110c91bfaf4479167434a1953d15bcdf1df622dd5226bb250a9
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous links to external websites, many of which are structured as SEO link farms, promising game hacks and free currency. The heuristic 'PDF_GAME_HACK_REDIRECT_LURE' and the presence of multiple URLs like 'https://netcdn.tw/app/431946152/how-to-hack-a-roblox-account-password-2021-game-hack' strongly indicate a phishing or scam attempt. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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 https://netcdn.tw/app/431946152/how-to-hack-a-roblox-account-password-2021-game-hack PDF link annotation
    • http://zercalo.org/images/rbxfree-com-free-robux_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-free-spin-trick_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/minecraft-free-education_GM479516143.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-link-daily-get-free-spins-amp_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/how-to-get-gold-cards-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-mod_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/free-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/how-to-earn-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/free-roblox-card_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-free-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-free-spins-hack-link_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/mad-city-cheat-roblox_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-free-cards_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-free-spins-only_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/free-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • http://zercalo.org/images/how-to-hack-roblox-passwords_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-hack-apk-download-2021_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-free-spins-link-today-instagram_GM406889139.pdfIn PDF document text
    • https://discordIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000053f0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x53F0 27888 bytes
SHA-256: 5a9fd8b4b474c593ae6e62e68fe5dfb7527a7166ade6e5fb7dba6f121768e7b5
font_01_sfnt_off000093c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x93C0 2872 bytes
SHA-256: 5a38050e56bfed6ba013c4835499ae05f4b57b22e606c9172dd4bc2ae7fd1207
font_02_sfnt_off00009d7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9D7C 19320 bytes
SHA-256: d08aef323308ade01a3856b734b0aa84aaf1dcd5c258b6ea2b800275fb0608ce

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