Malicious PDF — malware analysis report

Static analysis result for SHA-256 18cfa525f05ca930…

MALICIOUS

PDF

34.0 KB Created: 2021-07-06 01:26:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: dd00b2461ba11747ab2750843eca8cad SHA-1: cbbffefba366c07ecb6e6c1b03282f0be5652f22 SHA-256: 18cfa525f05ca930869d0c621736451dd3e7942d5b377ff22a8052aad750487b
142 Risk Score

Malware Insights

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

This PDF document employs a lure of 'free Robux' and game hacks to entice users to click on external links. The primary link directs to 'netcdn.tw', which appears to be a redirector for malicious content. The document also contains a large number of SEO-optimized PDF links hosted on 'opac.heritagejkt.org', suggesting a link farm or a method to distribute further malicious content. The ML classifier strongly indicated maliciousness, and the presence of external links points towards a potential download or redirection to a second-stage payload.

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.tw/app/431946152/uprobuxcom-free-robux-game-hack PDF link annotation
    • https://opac.heritagejkt.org/repository/como-tener-robux-gratis-en-roblox-2021-hack_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/how-to-get-free-robux-on-roblox-mobile-2021_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/blogspot-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/coin-master-rewards_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/roblox-hack-scripts-jar_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/roblox-treasure-hunt-simulator-coin-hack_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/how-to-get-free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/coin-master-free-spins-apple_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/best-roblox-scripts-hack_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/bux-free-robux_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/free-robux-games-on-roblox-that-work-2021_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/roblox-free-robux-obby-link_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/how-to-hack-roblox-accounts-2021-with-wireshark_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/coin-master-gold-cards-hack_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/free-coin-master-spins-daily_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/coin-master-free-gift-link-2021_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/coin-master-free-spin-link-today-50_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/roblox-hack-scripts-2021_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/coin-master-hack-root_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/report-roblox-hacker_GM431946152.pdfIn PDF document text
    • https://www.roblox.com/.IIn 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_off00002ee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EE7 22028 bytes
SHA-256: ea7b49f36ec6f5462149abccda458df0b66c0480029d4eb4409da1569b09613a
font_01_sfnt_off00005fad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FAD 19152 bytes
SHA-256: 77e1d77af257f2799f450e4aedc0e1b3eb2c97b8c20e190c5e1e9f2e5b207ac7

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