Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b113dd17b1b8a47…

MALICIOUS

PDF

35.2 KB Created: 2021-07-04 22:33:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: c635116eacc39196517f1e8d407b725a SHA-1: f10ccdaca528bd8648dfdb22cda1def16514e438 SHA-256: 5b113dd17b1b8a47c0f5c71e6802ba849232e4b86b96b20124308b156444a148
200 Risk Score

Malware Insights

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

This PDF document is designed as a lure, impersonating brands like Facebook to trick users into clicking links for game hacks or currency. The primary link, http://netcdn.tw/app/431946152/free-robux-without-human-verification-2021-game-hack, leads to known malicious redirector infrastructure. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to exploit user interest in free in-game items to redirect them to potentially malicious sites, likely involving further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: http://netcdn.tw/app/431946152/free-robux-without-human-verification-2021-game-hack.
  • 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/free-robux-without-human-verification-2021-game-hack In PDF document text
    • http://library.stieyapan.ac.id//repository/robux-sign_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/descargar-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-unlimited-coins-hack-apk-download_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/free-spin-coin-master-new-link_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/coin-master-free-spins-link-today-hack_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/tryrbx-site-free-robux_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/ww-free-robux-com_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/free-tiktok-editor_GM835599320.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/free-robux-for-real-2021_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/facebook-coin-master_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/minecraft-ios-mods_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-400-spin-link-hack_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/roblox-18_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/how-to-hack-roblox-jailbreak-money-2021_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-tricks-and-hacks_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/robux-codes_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/roblox-free-iteams_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/free-spins-coin-master-links-no-human-verification_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/free-vip-server-roblox_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/minecraft-realms-free-codes_GM479516143.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_off00002fea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FEA 22320 bytes
SHA-256: 6d640a7bb4d207471a1eaa8c7b2b262d28d9f7c436949b6cadac6f24986d33eb
font_01_sfnt_off000061b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61B2 20100 bytes
SHA-256: 224766b145fea2ee77d6018406834ac88e8b97acd6b6511a2b41135dc58ea70f

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