Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7622cb90ea4522f…

MALICIOUS

PDF

35.5 KB Created: 2021-07-05 15:32:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: f52a08689a41fbd9039f1a017cd0d8e3 SHA-1: 8324b979fb83b9017930ff3d708af15a0b201283 SHA-256: a7622cb90ea4522f568ebd0623d0d69bc7b1040b3d05058c238b76a0e78b9ccc
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, disguised as free game hacks or generators. The primary redirector URL is http://netcdn.tw/app/431946152/free-roblox-codes-2021-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a social engineering lure to drive users to potentially malicious content or downloads. The ML classifier also flagged this PDF with high confidence.

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/free-roblox-codes-2021-game-hack In PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/free-roblox-shirt-templates-2021_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/free-coin-master-coins_GM406889139.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/free-robux-2021-real_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/smart-lodhi-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/free-robux-hack-no-inspect-and-element-2021-not-patched_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/coin-master-fan_GM406889139.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/can-you-give-me-robux_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/how-to-get-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/spins-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/sites-for-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/coin-master-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/hack-robux-2021-fr_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/minecraft-free-download-windows-10_GM479516143.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/free-robux-ios-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/free-black-clover-roblox-accesories_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/how-to-hack-knifes-in-assassin-roblox_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/compte-roblox-hack_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/how-to-get-free-bc-in-roblox-pastebin_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/fly-hack-download-for-jailbreak-roblox_GM431946152.pdfIn PDF document text
    • https://www.roblox.com/.IIn 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_off000031da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31DA 22828 bytes
SHA-256: c3c4cd34ae8d7fdf475220a2b1ba7518ca6f63865f3124f92e0238eccaa5a8ef
font_01_sfnt_off000064fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64FE 19228 bytes
SHA-256: ed0cdc110a2a956eeb6aac9ce416b1528a5bed00449fa61b89a4125e4ac6fa5f

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