Malicious PDF — malware analysis report

Static analysis result for SHA-256 42315e7dfbe42ab1…

MALICIOUS

PDF

35.1 KB Created: 2021-06-20 06:24:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 72789727444e4a8c8bd13ac1a313ac69 SHA-1: 104375058dd3d8cda294a52de9ff444e633a2dd4 SHA-256: 42315e7dfbe42ab1408a12162c82e222f4929a0d91f662efeaa2078bb456b138
142 Risk Score

Malware Insights

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

The PDF document contains numerous links and a call-to-action phrase, directing users to websites that promise game hacks and free in-game items. This is a common lure for phishing or malware distribution. The heuristic firings indicate a link farm designed to redirect users, and the ML classifier strongly suggests malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious lure designed to exploit user interest in free game-related content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/406889139/coin-master-free-2021-spin-link-today-game-hack PDF link annotation
    • https://www.nordicstar.co.uk/uploads/files/files/coin-master-spin-hack-trick_GM406889139.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/hack-client_GM479516143.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/how-to-get-admin-free-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/coin-master-free-spins-8-14-2021_GM406889139.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/roblox-northern-frontier-anti-cheat-bypass_GM431946152.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/pokemon-go-for-free-download_GM1094591345.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/is-minecraft-java-edition-free_GM479516143.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/give-me-free-robux_GM431946152.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/free-roblox-cards-2021_GM431946152.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/rbx-hut_GM431946152.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/how-to-get-free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/cheats-roblox-mega-fun-obey_GM431946152.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/coin-master-free-spins-link-no-verification-2021_GM406889139.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/robux-hack-tool-android_GM431946152.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/free-printable-roblox-coloring-pages_GM431946152.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/games-in-roblox-that-give-you-robux_GM431946152.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/how-to-get-free-admin-in-roblox_GM431946152.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/roblox-noscope-sniping-hack-v3rmillion_GM431946152.pdfIn PDF document text
    • https://www.nordicstar.co.uk/uploads/files/files/free-coin-spin_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_off0000313c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x313C 22640 bytes
SHA-256: 7b5ee8f29342399168f377f02bd4baf52f92a09e846eed4645bce0df13359b4a
font_01_sfnt_off000063cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63CD 19100 bytes
SHA-256: 827fa8b7f69ea23430b11d0a5a0138b83120a1107722004eca5be2f5cbc76a94

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