Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c3bbf913ddeb1ae…

MALICIOUS

PDF

45.8 KB Created: 2021-06-03 23:07:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 1ff128ec75382ae13fe0756eb830f563 SHA-1: 6078ac76750b3efa18fd1d554bc044f2768bd3f2 SHA-256: 2c3bbf913ddeb1aef83c19189e7948d0fdf65bfc415fd3181d878884b50f803c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically promoting 'free Robux' or 'game hacks' to entice users. The primary malicious URL identified is https://netcdn.online/app/431946152/how-to-get-free-robux-without-verification-2021-game-hack. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a redirection-based social engineering attack, likely intended to lead users to a phishing or malware download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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 https://netcdn.online/app/431946152/how-to-get-free-robux-without-verification-2021-game-hack In PDF document text
    • http://perpus.stmik-im.ac.id/repository/get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/coin-master-34-5-hack_GM406889139.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/free-pet-treats-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/hack-coin-pro-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/coin-mast-hacks_GM406889139.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/coin-master-free-spins-2021-apk_GM406889139.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/coin-master-hack-xyz-apk-download_GM406889139.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/robux-com-free_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/free-hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/free-robux-codes-2021-not-used_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/who-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/coin-master-free-spins-1-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/is-roblox-free-on-pc_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/mcpe-com_GM479516143.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/hacked-roblox-accounts-list_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/how-to-get-free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/free-robux-website_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/ways-to-get-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/minecraft-server-free-trial_GM479516143.pdfIn PDF document text
    • http://perpus.stmik-im.ac.id/repository/roblox-adopt-me-hack_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
stream_004_off00004e39.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E39 26988 bytes
SHA-256: e7a4f1c412b39c08b96c49b809f4052bafc2da21c8147c9834aa31ee216101e4
font_01_sfnt_off00008c96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C96 19528 bytes
SHA-256: 1b346556c7df455cb9a54b8f1a6e3f1a0bfffa2d9228fa0640c35d2bdb9db684

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