Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf4e41f234619c89…

MALICIOUS

PDF

33.9 KB Created: 2021-06-26 02:05:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 58f9b6e4778b79cd5819272ab4570262 SHA-1: dfcfbb080ba727b06df1970436c4e54d94a4b6bf SHA-256: cf4e41f234619c892deeb117385666d84c8636c52c885396ba9546d014bbe2bb
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a game hack redirector lure, pointing to malicious infrastructure. The document body and embedded URLs reinforce this by advertising free game hacks and generators. The ML classifier also flagged this PDF with high confidence, indicating malicious intent.

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/robux-builders-club-free-game-hack In PDF document text
    • https://apply.skubi.eu.org/wp-content/uploads/fsqm-files/5-robux-for-free_GM431946152.pdfIn PDF document text
    • https://apply.skubi.eu.org/wp-content/uploads/fsqm-files/cobalt-wings-free-roblox_GM431946152.pdfIn PDF document text
    • https://apply.skubi.eu.org/wp-content/uploads/fsqm-files/installer-script-roblox-hack-gui_GM431946152.pdfIn PDF document text
    • https://apply.skubi.eu.org/wp-content/uploads/fsqm-files/robloxcheatnewcom-hack_GM431946152.pdfIn PDF document text
    • https://apply.skubi.eu.org/wp-content/uploads/fsqm-files/how-to-change-username-roblox-for-free-2021_GM431946152.pdfIn PDF document text
    • https://apply.skubi.eu.org/wp-content/uploads/fsqm-files/free-roblox-accounts-with-robux_GM431946152.pdfIn PDF document text
    • https://apply.skubi.eu.org/wp-content/uploads/fsqm-files/roblox-bubblegum-simulator-cheats_GM431946152.pdfIn PDF document text
    • https://apply.skubi.eu.org/wp-content/uploads/fsqm-files/how-to-hack-roblox-accounts-2021-october_GM431946152.pdfIn PDF document text
    • https://apply.skubi.eu.org/wp-content/uploads/fsqm-files/how-to-fix-a-hacked-roblox-game_GM431946152.pdfIn PDF document text
    • https://apply.skubi.eu.org/wp-content/uploads/fsqm-files/robux-hack-tools_GM431946152.pdfIn PDF document text
    • https://apply.skubi.eu.org/wp-content/uploads/fsqm-files/free-robux-generator-no-verify_GM431946152.pdfIn PDF document text
    • https://apply.skubi.eu.org/wp-content/uploads/fsqm-files/how-to-get-money-on-roblox-a-hack_GM431946152.pdfIn PDF document text
    • https://apply.skubi.eu.org/wp-content/uploads/fsqm-files/best-free-clothing-on-roblox_GM431946152.pdfIn PDF document text
    • https://apply.skubi.eu.org/wp-content/uploads/fsqm-files/how-to-get-free-robux-100-real-2021_GM431946152.pdfIn PDF document text
    • https://apply.skubi.eu.org/wp-content/uploads/fsqm-files/roblox-work-at-a-pizza-place-cheats-2021_GM431946152.pdfIn PDF document text
    • https://apply.skubi.eu.org/wp-content/uploads/fsqm-files/youtube-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://apply.skubi.eu.org/wp-content/uploads/fsqm-files/how-to-get-free-robux-using-inspect-2021_GM431946152.pdfIn PDF document text
    • https://apply.skubi.eu.org/wp-content/uploads/fsqm-files/hacks-para-tener-dinero-en-arsenal-roblox_GM431946152.pdfIn PDF document text
    • https://apply.skubi.eu.org/wp-content/uploads/fsqm-files/free-stuff-2021-roblox_GM431946152.pdfIn PDF document text
    • https://apply.skubi.eu.org/wp-content/uploads/fsqm-files/minecraft-online-free-no-download_GM479516143.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
font_00_sfnt_off00002f68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F68 21764 bytes
SHA-256: 3ca23170434b213939992320b5d38c9664ba817d870f992c20794d645303f2ab
font_01_sfnt_off00005f60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F60 19084 bytes
SHA-256: 0c67620e34b6403c53c57009553b078ebb007b6e4fcdce6aa97faf6035ca29b9

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