Malicious PDF — malware analysis report

Static analysis result for SHA-256 c74823eacd7fc6b5…

MALICIOUS

PDF

44.8 KB Created: 2021-06-08 21:19:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 9ef3fb1ce6a9c333125e055ddcfe5af7 SHA-1: 1d7997f34c8df24286128c70ffffb4e57909bd4b SHA-256: c74823eacd7fc6b5eef824ee1f2f0f94af3142b1265799194af7ef1e459fa1eb
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains embedded links that redirect to malicious infrastructure, specifically advertising 'free Robux' and 'game hacks'. The ML classifier also flagged this PDF as malicious. The document body, though heavily obfuscated, contains references to these lures and the malicious URLs. The primary attack pattern involves luring users with promises of in-game currency or cheats to a redirector that likely leads to further malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.tw/app/431946152/22-500-free-robux-game-hack In PDF document text
    • https://www.gvandenakker.nl/images/coin-master-cheats-free_GM406889139.pdfIn PDF document text
    • https://www.gvandenakker.nl/images/coin-master-unlimited-spins_GM406889139.pdfIn PDF document text
    • https://www.gvandenakker.nl/images/millions-of-free-robux_GM431946152.pdfIn PDF document text
    • https://www.gvandenakker.nl/images/blogger-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.gvandenakker.nl/images/coin-master-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • https://www.gvandenakker.nl/images/free-spins-coin-master-unlimited_GM406889139.pdfIn PDF document text
    • https://www.gvandenakker.nl/images/how-to-get-coin-master-card-free_GM406889139.pdfIn PDF document text
    • https://www.gvandenakker.nl/images/how-do-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.gvandenakker.nl/images/free-coins-and-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.gvandenakker.nl/images/free-robux-youtube_GM431946152.pdfIn PDF document text
    • https://www.gvandenakker.nl/images/free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • https://www.gvandenakker.nl/images/bring-somone-infront-of-you-hack-roblox_GM431946152.pdfIn PDF document text
    • https://www.gvandenakker.nl/images/coin-master-hack-version_GM406889139.pdfIn PDF document text
    • https://www.gvandenakker.nl/images/haktuts-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • https://www.gvandenakker.nl/images/minecraft-hacked-client-18_GM479516143.pdfIn PDF document text
    • https://www.gvandenakker.nl/images/codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.gvandenakker.nl/images/how-many-free-spin-links-is-there-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.gvandenakker.nl/images/how-to-hack-roblox_GM431946152.pdfIn PDF document text
    • https://www.gvandenakker.nl/images/get-robux_GM431946152.pdfIn PDF document text
    • https://www.gvandenakker.nl/images/how-to-get-free-robux-without-doing-anything-2021_GM431946152.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_004_off000050f1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50F1 25568 bytes
SHA-256: d0df385c7fc8437b2c0b4c8ae0f14332e62b8342e9ec97f9b975f5073889934c
font_01_sfnt_off00008beb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BEB 18444 bytes
SHA-256: 1a093e42da1692f54dbc62360f1c89bb2d4bcc1448227efc8e6488b4f1b9883c

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