Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c484821bba6e653…

MALICIOUS

PDF

34.7 KB Created: 2021-07-04 08:47:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 2131ef971ed5a9ca002c1820f93b72c1 SHA-1: f30f40d2103342d5eca924d7047b4c5df4d4fe58 SHA-256: 0c484821bba6e653d6360e1912217cf62f186f92e66a9656511794294d1d899f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple embedded links that redirect to malicious infrastructure, specifically promoting 'free Robux' or game hacks. The primary redirector URL is http://netcdn.tw/app/431946152/rbxcity-free-robux-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or scam attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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/rbxcity-free-robux-game-hack In PDF document text
    • http://www.stttekstil.ac.id/elib/repository/free-robux-generator-2021-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/free-roblox-catalog-heaven-games_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/coin-master-apk_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/get-free-robux-com_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/how-to-get-free-items-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/coin-master-hack-version_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/how-to-get-free-snacks-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/tiktok-free-views_GM835599320.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/25-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/c00lkidd-roblox-how-to-get-his-hacks_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/does-roblox-premium-expire_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/coin-master-tiradas-gratis_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/comment-cheat-roblox_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/minecraft-hacks-xbox_GM479516143.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/robux-generator-that-works_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/roblox-free-wings-in-catalog_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/roblox-with-free-robux_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/coin-master-mod-apk-hack_GM406889139.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_off00003233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3233 21860 bytes
SHA-256: 0383b4cc395de7b38e8210ed6242509a2fcc5f8d1199867b33b10a73662da3df
font_01_sfnt_off0000627c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x627C 19120 bytes
SHA-256: 907f950e015ca7f55d34c04d668a41be98fd0850b0b9f22eb15d2dc956c9f495

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