Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2a8369e0c38d0b3…

MALICIOUS

PDF

43.2 KB Created: 2021-05-19 05:44:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 55aeb05350d3329326f4cceb89d6a3b5 SHA-1: 161da85190c84bdcec594892298edda0eaaecde3 SHA-256: d2a8369e0c38d0b3635b60f6da2d54301c4d8a3e3e754e395b4498e32bebe16d
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are structured as SEO link farms for game hacks and free in-game currency. The primary lure appears to be related to PUBG UC codes and other popular games. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a large number of outbound links designed to attract traffic, likely to malicious or scam-related content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 5

  • 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.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/1330123889/what-pubg-uc-code-game-hack PDF link annotation
    • https://www.wco.org.uk/uploads/files/files/free-robux-no-verification-no-download-2021_GM431946152.pdfIn PDF document text
    • https://www.wco.org.uk/uploads/files/files/coin-master-free-spins-and-coins-today-gift-reward_GM406889139.pdfIn PDF document text
    • https://www.wco.org.uk/uploads/files/files/coin-master-hack-spin-generator-tool_GM406889139.pdfIn PDF document text
    • https://www.wco.org.uk/uploads/files/files/how-to-hack-coin-master-game-ios_GM406889139.pdfIn PDF document text
    • https://www.wco.org.uk/uploads/files/files/coin-master-hacks-no-downloading_GM406889139.pdfIn PDF document text
    • https://www.wco.org.uk/uploads/files/files/how-to-get-free-spins-and-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.wco.org.uk/uploads/files/files/best-minecraft-hacks_GM479516143.pdfIn PDF document text
    • https://www.wco.org.uk/uploads/files/files/robux-free-robux_GM431946152.pdfIn PDF document text
    • https://www.wco.org.uk/uploads/files/files/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://www.wco.org.uk/uploads/files/files/how-to-use-scripts-in-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.wco.org.uk/uploads/files/files/free-robux-no-human-verification-no-survey_GM431946152.pdfIn PDF document text
    • https://www.wco.org.uk/uploads/files/files/coin-master-free-spins-whatsapp-link_GM406889139.pdfIn PDF document text
    • https://www.wco.org.uk/uploads/files/files/roblox-robux-generator-http-freerobuxgenerator-xyz_GM431946152.pdfIn PDF document text
    • https://www.wco.org.uk/uploads/files/files/coin-master-hack-without-human-verification-2021_GM406889139.pdfIn PDF document text
    • https://www.wco.org.uk/uploads/files/files/coin-master-link-daily-get-free-spins-amp_GM406889139.pdfIn PDF document text
    • https://www.wco.org.uk/uploads/files/files/minecraft-aimbot_GM479516143.pdfIn PDF document text
    • https://www.wco.org.uk/uploads/files/files/roblox-com-free-play_GM431946152.pdfIn PDF document text
    • https://www.wco.org.uk/uploads/files/files/coin-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • https://www.wco.org.uk/uploads/files/files/roblox-pink-free-robux_GM431946152.pdfIn PDF document text
    • https://www.wco.org.uk/uploads/files/files/robux-free-gift-card-org-hack_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_003_off00004b65.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B65 24736 bytes
SHA-256: 99ef4e7dbeb80f60918b110c77d2c7320aeaa045dd5ea516f8c371c9d28b49f8
font_01_sfnt_off0000847b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x847B 18912 bytes
SHA-256: a991185d7b011e92c935ad58d479deeb81d1dcb9720722411278c057e7d5b769

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