Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf439eb37d666025…

MALICIOUS

PDF

47.2 KB Created: 2021-05-16 23:11:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 30705a9cc6b5b3939bde34ab43be89f2 SHA-1: 47a529050082a1d5fdbc3554c853cc5d8b931c8a SHA-256: bf439eb37d66602568824223589fed705dec88e9ca04380cd3a6276c81ef13b5
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF document contains multiple links that redirect to malicious infrastructure, masquerading as a "free generator / game hack" lure. It impersonates Microsoft to trick users into clicking the malicious link, which is a common credential phishing tactic. The primary malicious URL identified is https://netcdn.xyz/app/431946152/robux-free-promo-codes-game-hack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

Heuristics 5

  • 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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.xyz/app/431946152/robux-free-promo-codes-game-hack.
  • 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/robux-free-promo-codes-game-hack In PDF document text
    • https://www.croatia-flyfishing.com/files/coin-master-spin-link-hack_GM406889139.pdfIn PDF document text
    • https://www.croatia-flyfishing.com/files/game-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://croatia-flyfishing.com/files/coin-master-hack-ios-cydia_GM406889139.pdfIn PDF document text
    • https://www.croatia-flyfishing.com/files/how-to-get-minecraft-pe-for-free-ios_GM479516143.pdfIn PDF document text
    • https://www.croatia-flyfishing.com/files/coin-master-gold-cards-free-2021_GM406889139.pdfIn PDF document text
    • https://www.croatia-flyfishing.com/files/free-robux-real-2021_GM431946152.pdfIn PDF document text
    • http://croatia-flyfishing.com/files/free-roblox-groups_GM431946152.pdfIn PDF document text
    • http://croatia-flyfishing.com/files/coin-master-free-spin-today_GM406889139.pdfIn PDF document text
    • http://croatia-flyfishing.com/files/coin-master-fun-hack_GM406889139.pdfIn PDF document text
    • http://croatia-flyfishing.com/files/free-robux-quiz_GM431946152.pdfIn PDF document text
    • http://croatia-flyfishing.com/files/how-to-earn-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://www.croatia-flyfishing.com/files/can-you-really-hack-coin-master-ios_GM406889139.pdfIn PDF document text
    • https://www.croatia-flyfishing.com/files/free-coin-master-spins-link_GM406889139.pdfIn PDF document text
    • https://www.croatia-flyfishing.com/files/apps-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.croatia-flyfishing.com/files/coin-master-fan-page-free-spins_GM406889139.pdfIn PDF document text
    • http://croatia-flyfishing.com/files/roblox-images_GM431946152.pdfIn PDF document text
    • https://www.croatia-flyfishing.com/files/hack-coin-master-without-human-verification_GM406889139.pdfIn PDF document text
    • https://www.croatia-flyfishing.com/files/sites-for-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.croatia-flyfishing.com/files/coins-master-hacks_GM406889139.pdfIn PDF document text
    • https://www.croatia-flyfishing.com/files/robuxy-com-free-robux_GM431946152.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
stream_003_off00004bf5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BF5 27912 bytes
SHA-256: cd5c8e6a28daec1601fc9d9f805c8f822ad821a23d6c650f40bf049baa3655eb
font_01_sfnt_off00008b67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B67 2824 bytes
SHA-256: bd082aa73fbb1a8b3bd2e5c998d3d8e31d1dfc71ea36f846af746f69a0d2ab7f
font_02_sfnt_off0000951b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x951B 18604 bytes
SHA-256: 72370e69d4b3437de95b76ada03da26e1fdb3d0ee534a059885e6f785b63064d

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