Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec235a9e108a1008…

MALICIOUS

PDF

34.5 KB Created: 2021-07-04 04:40:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 66a04fe800103bb9ca7ef89290cf54b6 SHA-1: 6d6793b3bedc908671cb748830be5a7c0c0f7e6d SHA-256: ec235a9e108a100837dfdef86f07f3dc596cf52c3f6f64e5caaf48f3809ed3e8
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links, including a primary redirector URL, that lead to websites offering game hacks and generators. These links are designed to lure users into clicking, potentially leading to further malicious content or downloads. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/coin-master-free-spins-and-coins-today-game-hack In PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/free-robux-obby-no-password-2021_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/free-roblox-shiny-charm-for-pokemon-prick-bronze_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/free-roblox-followers-generator_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/butterfly-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/coin-master-hack-without-verify_GM406889139.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/free-roblox-shirts-templates_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/free-robux-sites-that-work_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/illegal-roblox-hacks_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/free-fe-roblox-script_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/free-coin-master-spin-app_GM406889139.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/coin-master-coins_GM406889139.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/free-robux-ninja_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/how-to-make-free-robux_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/how-to-get-fre-robux-2021-not-fake-ral-2021_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/150-dollar-roblox-redeem-codes-free-no-survey_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/coin-master-free-spins-link-today-new-2021_GM406889139.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/free-robux-com-no-verification_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/free-robux-with-no-survey_GM431946152.pdfIn PDF document text
    • https://www.owlweb.co.uk/uploads/files/files/roblox-promo-codes-free-robux_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_002_off0000314e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x314E 22444 bytes
SHA-256: 0d543cabcc817cfaa5442c80f6ce267eecc7d5456f920430c9574becff9ad138
font_01_sfnt_off0000635d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x635D 18528 bytes
SHA-256: 64e6d113bd97b02afb7632d7b1c85a61d3fc47f14b318ce8b72a94cd305839a3

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