Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fcfebb273c6d17c…

MALICIOUS

PDF

34.2 KB Created: 2021-06-25 14:21:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 622bc66bdba2f8838fc13a33fac02012 SHA-1: 3bd5f02cda4029ee0f84e3b8f1bb57c617203c8e SHA-256: 3fcfebb273c6d17c03f438431bd7533d9da48e224cfba8ace9c58f2a1b02d6ff
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links and a lure related to 'free Robux' and game hacks, indicating a phishing or scam attempt. The heuristic 'PDF_SEO_LINK_FARM' suggests a large number of external links were generated, likely for SEO manipulation or to distribute malicious content. The primary URL http://netcdn.co/app/431946152/how-to-gert-free-robux-hacks-no-virus-game-hack is a key indicator of the scam's nature.

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/how-to-gert-free-robux-hacks-no-virus-game-hack PDF link annotation
    • http://library.unissula.ac.id/fk/repository/free-robux-no-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/hack-the-coin-master-game_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/how-to-get-free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/minecraft-xbox-one-edition-digital-code-free_GM479516143.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/coin-master-spin-hack-2021_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/coin-master-free-spins-23-march-2021_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/how-to-cheat-in-leavels-booga-booga-roblox_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/coin-master-free-spins-link-2021-march_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/roblox-free-vip-server_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/free-robux-on-computer-app_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/free-robux-for-playing-games_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/coin-master-hack-injection_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/free-coin-master-gifts_GM406889139.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/free-roblox-shirt-templates-2021_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/how-to-generate-free-robux_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fe/repository/free-admin-roblox_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/what-tiktok-free-robux_GM835599320.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/is-pokemon-go-community-day-free_GM1094591345.pdfIn PDF document text
    • http://library.unissula.ac.id/fk/repository/glitch-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://library.unissula.ac.id/fk//repository/free-100-robux_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_off00002f48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F48 21968 bytes
SHA-256: 807fcf74bf9b88985087b9cd4244103e48fbd02c99ee6206eaadb35d94052bd1
font_01_sfnt_off00005f83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F83 19408 bytes
SHA-256: d1cae5f9333cacbeeb454698e262fe6dea532df758fb5d48ddc4c301aa5dbae6