Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0ad2f6550f58308…

MALICIOUS

PDF

50.7 KB Created: 2021-06-03 21:34:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: c7115a316b7b19860b1574c767a7e472 SHA-1: f8af059926924f7f420b29c3c608bc2919ce30b4 SHA-256: d0ad2f6550f583083b6446494e669a87df88810a3f6d8d4d589b690e4e809577
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'. The primary lure URL is https://netcdn.online/app/431946152/free-robux-giveaway-game-hack, which is associated with malicious redirector infrastructure. The document body, though heavily obfuscated, contains references to this URL and other similar lures hosted on kojak-group.com, indicating a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9779

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/free-robux-giveaway-game-hack In PDF document text
    • https://kojak-group.com/userfiles/files/coin-master-free_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/free-robux-no-verification-at-all_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/minecraft-hacked-client-download_GM479516143.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/coin-master-apk-hack-3527_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/coin-master-free-cards-2021_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/fan-page-coin-master_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/get-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/coin-master-game-hack-app_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/how-to-hack-someones-roblox-account-2021_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/coin-master-hack-online-2021_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/how-many-villages-are-in-coin-master_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/https-iosgodscom-topic-20214coinmasterhack_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/pubg-uc-20_GM1330123889.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/coin-master-hacks-iphone_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/how-to-download-minecraft-for-free-on-your-phone_GM479516143.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/free-minecraft-premium-account_GM479516143.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/coin-master-free-coins-and-spins-app_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/but-link-says-free-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000050c1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50C1 32240 bytes
SHA-256: b3e2a2d9a4a0cca863d7ca31255e6d9f350bbe318ada938688ffa6e6f810fc69
font_01_sfnt_off00009860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9860 2832 bytes
SHA-256: 77ae1c4cffa647a8fd533dfa4102e94364989f9e80b9cd131876e9d1005899a2
font_02_sfnt_off0000a210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA210 18820 bytes
SHA-256: a907981f6338d23acda294c558170907db38f399f16fdb2ca0bc536a0b707f6d

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