Malicious PDF — malware analysis report

Static analysis result for SHA-256 af88db39350deb44…

MALICIOUS

PDF

35.0 KB Created: 2021-06-30 00:15:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: efee5cc87c9f9329d61a794b4237719e SHA-1: e052378012f55420d43f54e3511317d100a2256b SHA-256: af88db39350deb445337995c16086495980ecb9e16f867afe8aa43f2a27a2367
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that point to known malicious redirector infrastructure, specifically http://netcdn.co/app/431946152/why-won't-cheat-engine-work-on-roblox-game-hack. The document body and extracted URLs suggest a lure related to game cheats and free virtual currency, aiming to trick users into clicking the malicious link. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 3

  • 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.co/app/431946152/why-won In PDF document text
    • http://perpus.ar-rum.ac.id//repository/free-robux-generator-no-human-verification-or-surveys_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id/repository/how-to-get-free-robux-on-ipad-no-download_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id/repository/fairy-tail-online-roblox-hack_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id/repository/admin-hack-download-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id/repository/tokyo-ghoul-project-killzone-roblox-cheat_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/actual-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id/repository/free-roblox-users_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/daily-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/free-robux-2021_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id/repository/wwwbandicamcom-free-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/how-to-hack-coin-master-cheat-engine_GM406889139.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/can-i-get-robux-for-free_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id/repository/how-to-get-free-ranks-in-roblox-groups_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/free-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/free-rewards-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/free-spins-coin-master-app-ios_GM406889139.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/coin-master-free-spins-link-no-verification-2021_GM406889139.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id/repository/how-to-look-like-myusernamesthis-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/collect-robux_GM431946152.pdfIn PDF document text
    • http://perpus.ar-rum.ac.id//repository/coin-master-hack-app-for-ios_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_off000030c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30C0 22456 bytes
SHA-256: 26bf55c8578368ec59b1532a982d10f95a70eced6be981eb3b5102d333bdb33d
font_01_sfnt_off00006288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6288 19488 bytes
SHA-256: 67403b46b0dfa19211071e4a3da0c6a5300bd578f10791a91310a24f8802e9a7

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