Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b4f5eeb3db32e3c…

MALICIOUS

PDF

35.2 KB Created: 2021-06-29 09:34:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: c8c33f7fc089d55cb90608e3b600a313 SHA-1: ea6e818e8d9e5507c2d32184cb33f390c5a41930 SHA-256: 8b4f5eeb3db32e3ce3e75b8ecccf8b2509ea878d17f86baa2234cf110861fc50
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains embedded links that lead to a malicious redirector infrastructure, specifically targeting users interested in game hacks and free in-game currency like Robux. The ML classifier strongly flagged this PDF as malicious, and the presence of a download button lure reinforces the deceptive nature of the document. The primary attack vector appears to be tricking users into clicking malicious links, likely leading to further malware downloads or phishing attempts.

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.co/app/431946152/http-www-cheatsguru-com-pc-roblox-cheats-codes-game-hack In PDF document text
    • http://elib-s2.ubl.ac.id/repository/huskybuckscom-free-robux_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/hackear-robux_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/glitched-things-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/coin-master-free-spins-and-coins-blogspot_GM406889139.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/descargar-roblox-hackeado-adopt-me-para-pc_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/how-to-speed-hack-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/free-exploits-for-roblox_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/wahoogaming-co-free-robux_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/how-to-get-free-in-roblox_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/roblox-hacks-2021_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/one-piece-open-seas-hack-roblox_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/hack-pc-roblox_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/how-to-hack-an-acount-on-roblox_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/free-robux-accounts-youtube_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/roblox-lumber-tycoon-2-cheats-xbox-one_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/roblox-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/roblox-jailbreak-hack-2021-noclip_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/how-to-get-free-robux-online-no-survey_GM431946152.pdfIn PDF document text
    • http://elib-s2.ubl.ac.id/repository/roblox-hack-money-jailbreak-2021_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_off0000317b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x317B 21960 bytes
SHA-256: 46539bd65abc370dee7531680e93ca8f3f9a07dd023c23ad889c3e2b94793e5a
font_01_sfnt_off0000619d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x619D 20024 bytes
SHA-256: e105771558f4191feb7f1cc870a4452f28ce7c7b2568d517b26da3591064d0a9

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