Malicious PDF — malware analysis report

Static analysis result for SHA-256 2efd1aa36847e97c…

MALICIOUS

PDF

36.1 KB Created: 2021-07-06 02:08:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 531d05c0bbd1cb9a729576d5c13950dc SHA-1: 324b16e04e767690d6f8817af587d6c0007cc6be SHA-256: 2efd1aa36847e97c65ab7d3fd33e043cbd46d38c1e983b63fa25404fe460c8e4
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and lures users with promises of game hacks and free currency. The primary malicious URL identified is http://netcdn.tw/app/406889139/twitter-coin-master-free-spins-game-hack. The document body and heuristics indicate a social engineering tactic to drive users to potentially malicious websites for further exploitation.

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.tw/app/406889139/twitter-coin-master-free-spins-game-hack In PDF document text
    • https://jasabuatlabel.com/ckfinder/userfiles/files/cheat-engine-roblox-20212021_GM431946152.pdfIn PDF document text
    • https://jasabuatlabel.com/ckfinder/userfiles/files/robux-hacks-2021_GM431946152.pdfIn PDF document text
    • https://jasabuatlabel.com/ckfinder/userfiles/files/free-robux-generator-no-verification_GM431946152.pdfIn PDF document text
    • https://jasabuatlabel.com/ckfinder/userfiles/files/how-to-hack-roblox-on-mac-2021_GM431946152.pdfIn PDF document text
    • https://jasabuatlabel.com/ckfinder/userfiles/files/free-robux-com-2021_GM431946152.pdfIn PDF document text
    • https://jasabuatlabel.com/ckfinder/userfiles/files/como-hackear-juego-coin-master_GM406889139.pdfIn PDF document text
    • https://jasabuatlabel.com/ckfinder/userfiles/files/earn-free-robux-today_GM431946152.pdfIn PDF document text
    • https://jasabuatlabel.com/ckfinder/userfiles/files/coin-master-hack-2021-app-download_GM406889139.pdfIn PDF document text
    • https://jasabuatlabel.com/ckfinder/userfiles/files/free-robux-promo-codes-no-human-verification_GM431946152.pdfIn PDF document text
    • https://jasabuatlabel.com/ckfinder/userfiles/files/download-minecraft-java-edition-free_GM479516143.pdfIn PDF document text
    • https://jasabuatlabel.com/ckfinder/userfiles/files/how-to-hack-roblox-with-lucky-patcher-no-root_GM431946152.pdfIn PDF document text
    • https://jasabuatlabel.com/ckfinder/userfiles/files/1-million-robux-for-free_GM431946152.pdfIn PDF document text
    • https://jasabuatlabel.com/ckfinder/userfiles/files/free-rs-999-999-999-on-roblox_GM431946152.pdfIn PDF document text
    • https://jasabuatlabel.com/ckfinder/userfiles/files/roblox-how-to-get-an-invisible-head-for-free_GM431946152.pdfIn PDF document text
    • https://jasabuatlabel.com/ckfinder/userfiles/files/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • https://jasabuatlabel.com/ckfinder/userfiles/files/free-robux-macbook-version_GM431946152.pdfIn PDF document text
    • https://jasabuatlabel.com/ckfinder/userfiles/files/how-to-hack-draw-it-roblox_GM431946152.pdfIn PDF document text
    • https://jasabuatlabel.com/ckfinder/userfiles/files/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://jasabuatlabel.com/ckfinder/userfiles/files/free-spin-link-for-coin-master-haktuts_GM406889139.pdfIn PDF document text
    • https://jasabuatlabel.com/ckfinder/userfiles/files/coin-master-cards-free_GM406889139.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_off00003513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3513 23544 bytes
SHA-256: 9b4c3fe9b5b1f82e15a555cf753c3357407420b237ecfde27d19c54ef963b52c
font_01_sfnt_off00006a77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A77 18336 bytes
SHA-256: ace8529003dd85c0f7dacf2c69051d6549971c35597209070ab220570a697a3f

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