Malicious PDF — malware analysis report

Static analysis result for SHA-256 22488075745f3923…

MALICIOUS

PDF

46.7 KB Created: 2021-06-03 15:36:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 3ac4b1e786d7a11cc21d25d1913783dd SHA-1: ac468280178cc41193f98356d45f7c594c7b2583 SHA-256: 22488075745f39233d58be9cb891b1ac99be64a5fde0498de3132b873b1ae7f8
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, including a primary redirector disguised as a 'free generator / game hack' lure. These links lead to further PDF documents that appear to be part of a link farm designed to improve search engine ranking for scam-related keywords. The document's structure and content strongly suggest a phishing or scam campaign aimed at tricking users into visiting malicious or deceptive websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9748

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 https://netcdn.online/app/431946152/roblox-help-free-robux-game-hack In PDF document text
    • https://www.jcn.co.uk/uploads/files/files/how-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/mosttechs-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/coin-master-daily-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/install-coin-master_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/how-to-get-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/microsoft-bing-robux_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/how-to-coin-master-spin-hack_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/toolbox-for-minecraft-pe-mod-apk_GM479516143.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/how-do-you-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/game-hunters-coin-master_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/mcpe-com_GM479516143.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/free-robux-for-kids-no-verification_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/free-coin-master-gift-link_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/how-to-get-minecraft-windows-10-for-free-2021_GM479516143.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/easy-ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/download-hack-coin-master-apk_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/free-tiktok-views_GM835599320.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/roblox-hack-com_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/how-to-get-minecraft-windows-10-for-free_GM479516143.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_004_off00004f2c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F2C 24884 bytes
SHA-256: 1d362a6d12e99e97276a4d6164bed281df9c64dd886fe106b8ee4e249986a3b5
font_01_sfnt_off000088b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88B9 3120 bytes
SHA-256: 49734f51977507cba6bc8d3ad0cee0363aa119856db094427deb9cf565bb7bca
font_02_sfnt_off000093cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x93CC 18264 bytes
SHA-256: 4686decc205f725eac2af31d2bb610515d085fb80a4fbb870416018a21b04127

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