Malicious PDF — malware analysis report

Static analysis result for SHA-256 44abcd05fa9123de…

MALICIOUS

PDF

34.1 KB Created: 2021-07-03 22:01:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: acb154a4890af1f1229663c25b72206c SHA-1: afc231d94063147d9cbb48bf19e8b71ee0baa5ad SHA-256: 44abcd05fa9123de5e8fe45a5e31e6cf22e81e39f587fd330ce5842f11053ad0
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to malicious infrastructure, specifically a site offering "free generator / game hack" content. This is a common lure for distributing malware or conducting phishing. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the document's structure and embedded URLs indicate a malicious redirection attempt.

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/431946152/hack-avatar-game-hack In PDF document text
    • https://kitchenset-jogja.com/ckfinder/userfiles/files/how-to-get-1m-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://kitchenset-jogja.com/ckfinder/userfiles/files/free-roblox-gift-card-codes-no-human-verification_GM431946152.pdfIn PDF document text
    • https://kitchenset-jogja.com/ckfinder/userfiles/files/best-free-clothes-on-roblox_GM431946152.pdfIn PDF document text
    • https://kitchenset-jogja.com/ckfinder/userfiles/files/roblox-work-at-a-pizza-place-money-hack-script-pastebin_GM431946152.pdfIn PDF document text
    • https://kitchenset-jogja.com/ckfinder/userfiles/files/how-to-hack-roblox-with-command-promp_GM431946152.pdfIn PDF document text
    • https://kitchenset-jogja.com/ckfinder/userfiles/files/roblox-how-to-get-free-clothes-2021_GM431946152.pdfIn PDF document text
    • https://kitchenset-jogja.com/ckfinder/userfiles/files/coin-master-spin-ml_GM406889139.pdfIn PDF document text
    • https://kitchenset-jogja.com/ckfinder/userfiles/files/how-to-get-free-robux-2021-october_GM431946152.pdfIn PDF document text
    • https://kitchenset-jogja.com/ckfinder/userfiles/files/free-robux-denis_GM431946152.pdfIn PDF document text
    • https://kitchenset-jogja.com/ckfinder/userfiles/files/how-to-inject-dll-roblox-hack_GM431946152.pdfIn PDF document text
    • https://kitchenset-jogja.com/ckfinder/userfiles/files/free-robux-not-fake_GM431946152.pdfIn PDF document text
    • https://kitchenset-jogja.com/ckfinder/userfiles/files/free-roblox-card_GM431946152.pdfIn PDF document text
    • https://kitchenset-jogja.com/ckfinder/userfiles/files/buxblast-com-robux_GM431946152.pdfIn PDF document text
    • https://kitchenset-jogja.com/ckfinder/userfiles/files/how-to-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://kitchenset-jogja.com/ckfinder/userfiles/files/minecraft-net-download-free_GM479516143.pdfIn PDF document text
    • https://kitchenset-jogja.com/ckfinder/userfiles/files/coin-master-free-spins-hack-link_GM406889139.pdfIn PDF document text
    • https://kitchenset-jogja.com/ckfinder/userfiles/files/coin-master-free-spins-generator-no-human-verification_GM406889139.pdfIn PDF document text
    • https://kitchenset-jogja.com/ckfinder/userfiles/files/roblox-gift-card-online-free_GM431946152.pdfIn PDF document text
    • https://kitchenset-jogja.com/ckfinder/userfiles/files/free-spin-coin-master-game_GM406889139.pdfIn PDF document text
    • https://kitchenset-jogja.com/ckfinder/userfiles/files/get-free-robux-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
font_00_sfnt_off000030f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30F1 22268 bytes
SHA-256: 87738b6ad12fc30e8df2a7af8fefda4e7b4d0ddbbdcf2af2f134ddd98f29b3e6
font_01_sfnt_off0000627b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x627B 18292 bytes
SHA-256: 15fe832cb1a67f8b9b32bd16fa6b944b1b609e54d644db6923f8635996eddc7f

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