Malicious PDF — malware analysis report

Static analysis result for SHA-256 83c8fd15543c5a48…

MALICIOUS

PDF

47.8 KB Created: 2021-05-18 02:07:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: e0d5e4459d6d8fe84f9e36c917d38de8 SHA-1: 87aa22e017a37738247cc9211d3fc60e543071b5 SHA-256: 83c8fd15543c5a489f42ab3732b9c5ba9fa00828f0edc054803c679c66cbca95
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links designed to lure users into clicking on them by promising free Robux and game hacks. The primary link, https://netcdn.xyz/app/431946152/free-robux-generator-no-verification-2021-game-hack, is identified as a malicious redirector. The document body, though partially obfuscated, reinforces the theme of free game currency. The presence of embedded URLs and the nature of the lures strongly suggest a phishing or scamming attempt, likely leading to further malware download or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.xyz/app/431946152/free-robux-generator-no-verification-2021-game-hack In PDF document text
    • http://interokna-kuban.ru/images/info-roblox-com-robux_GM431946152.pdfIn PDF document text
    • http://interokna-kuban.ru/images/how-to-play-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • http://interokna-kuban.ru/images/cpbildco-robux_GM431946152.pdfIn PDF document text
    • http://interokna-kuban.ru/images/free-robux-android_GM431946152.pdfIn PDF document text
    • http://interokna-kuban.ru/images/free-robux-roblox-promo-codes_GM431946152.pdfIn PDF document text
    • http://interokna-kuban.ru/images/coin-master-free-spins-link-cheat_GM406889139.pdfIn PDF document text
    • http://interokna-kuban.ru/images/is-there-a-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://interokna-kuban.ru/images/master-8-ball-pool-free-coins_GM406889139.pdfIn PDF document text
    • http://interokna-kuban.ru/images/get-free-robux-today_GM431946152.pdfIn PDF document text
    • http://interokna-kuban.ru/images/websites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://interokna-kuban.ru/images/free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://interokna-kuban.ru/images/free-minecraft-packs_GM479516143.pdfIn PDF document text
    • http://interokna-kuban.ru/images/minecraft-hacks-xbox_GM479516143.pdfIn PDF document text
    • http://interokna-kuban.ru/images/roblox-free-hair-girl_GM431946152.pdfIn PDF document text
    • http://interokna-kuban.ru/images/blogspot-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://interokna-kuban.ru/images/coin-master-free-spins-fb-champion_GM406889139.pdfIn PDF document text
    • http://interokna-kuban.ru/images/coin-master-free-fire_GM406889139.pdfIn PDF document text
    • http://interokna-kuban.ru/images/huskybuckscom-free-robux_GM431946152.pdfIn PDF document text
    • http://interokna-kuban.ru/images/coin-master-hack-2021-ios_GM406889139.pdfIn PDF document text
    • http://interokna-kuban.ru/images/coin-master-hack-to-get-free-spins_GM406889139.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_003_off00004c82.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C82 33248 bytes
SHA-256: 8b6f5a50479f2a9f7ed79bc90a1ca9096565b75be5108e34e0a9b2a077d9282c
font_01_sfnt_off00009690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9690 19004 bytes
SHA-256: d45ec0ea85e3f4da21cb27ccd2cd6df352304457fff04a0939a67aeffe4f8bf1

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