Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a3923cbbdf1d4ab…

MALICIOUS

PDF

44.9 KB Created: 2021-05-15 03:47:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 04ac7bfbf856988e1bda06866bafec5c SHA-1: a544fb70e1ba55c3240fa7c81f54322f8d7a23e2 SHA-256: 0a3923cbbdf1d4ab35873ad14638a629b032eca6a9958d1e166f3384fd101db6
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains links that redirect to malicious infrastructure, specifically promoting "game hacks" and "free generators" to entice users. The document body and embedded URLs reinforce this lure, suggesting a phishing or scam attempt. While no scripts were directly extracted, the PDF's nature and the critical heuristic firings strongly indicate a malicious redirector chain designed to lead users to potentially harmful content or further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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/how-to-get-roebucks-game-hack In PDF document text
    • http://fobh.net/userfiles/files/free-robux-sites-that-work_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/bloxawards-com-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/roblox-prison-life-hack_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/coin-master-root-hack_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/how-to-play-minecraft-for-free-on-computer_GM479516143.pdfIn PDF document text
    • http://fobh.net/userfiles/files/village-coin_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/free-robux-glitch-2021_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/how-can-i-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://fobh.net/userfiles/files/coin-master-free-spins-hack-iphone_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/free-robux-place_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/how-to-hack-someones-account-on-roblox_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/free-op-minecraft-servers_GM479516143.pdfIn PDF document text
    • http://fobh.net/userfiles/files/coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/free-robux-gift-card_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/free-spins-and-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/https-iosgodscom-topic-20218flipmastercoinshack_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/hacks-master-coin_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/free-spins-on-coin-master-link_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/june-29-coin-master-hack-no-human-verification_GM406889139.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
font_00_sfnt_off00004aac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4AAC 24716 bytes
SHA-256: a00dcdea4f40fc1aa986cc45d7aad05e2c5e859d593106893dd20d013008d985
font_01_sfnt_off0000838f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x838F 2832 bytes
SHA-256: 77ae1c4cffa647a8fd533dfa4102e94364989f9e80b9cd131876e9d1005899a2
font_02_sfnt_off00008d3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D3F 18080 bytes
SHA-256: 011fab2319da63ee6edfd94b81fcdfa8ad38fc25a0e157c4a4fa77e4e52bce04

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