Malicious PDF — malware analysis report

Static analysis result for SHA-256 4493159235829f82…

MALICIOUS

PDF

35.2 KB Created: 2021-06-26 06:36:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d1a3ee18596834fd6d839f47886dc495 SHA-1: a9af0966807b007d8add53908efcf5db16e71953 SHA-256: 4493159235829f82deb32f191b8db93a0fb250859d1d8dfce5298357e193628f
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

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/431946152/free-roblox-com-accounts-game-hack PDF link annotation
    • http://www.biotrade.com.au/uploaded_files/userfiles/files/free-online-minecraft-server_GM479516143.pdfIn PDF document text
    • http://www.biotrade.com.au/uploaded_files/userfiles/files/coin-master-time-hack-ios_GM406889139.pdfIn PDF document text
    • http://www.biotrade.com.au/uploaded_files/userfiles/files/coin-master-free-spin-app-reviews_GM406889139.pdfIn PDF document text
    • http://www.biotrade.com.au/uploaded_files/userfiles/files/coin-master-free-spins-hack-link_GM406889139.pdfIn PDF document text
    • http://www.biotrade.com.au/uploaded_files/userfiles/files/free-robux-games_GM431946152.pdfIn PDF document text
    • http://www.biotrade.com.au/uploaded_files/userfiles/files/robux-hack-free-robux_GM431946152.pdfIn PDF document text
    • http://www.biotrade.com.au/uploaded_files/userfiles/files/free-robux-roblox-promo-codes_GM431946152.pdfIn PDF document text
    • http://www.biotrade.com.au/uploaded_files/userfiles/files/coin-master-free-spins-daily-link-updated_GM406889139.pdfIn PDF document text
    • http://www.biotrade.com.au/uploaded_files/userfiles/files/gameoffice-net-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://www.biotrade.com.au/uploaded_files/userfiles/files/haktuts-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.biotrade.com.au/uploaded_files/userfiles/files/free-spins-and-coins-coin-master-app_GM406889139.pdfIn PDF document text
    • http://www.biotrade.com.au/uploaded_files/userfiles/files/free-minecraft-education-edition_GM479516143.pdfIn PDF document text
    • http://www.biotrade.com.au/uploaded_files/userfiles/files/coin-master-free-coins-and-spins-link_GM406889139.pdfIn PDF document text
    • http://www.biotrade.com.au/uploaded_files/userfiles/files/how-to-get-free-robux-javascript-2021_GM431946152.pdfIn PDF document text
    • http://www.biotrade.com.au/uploaded_files/userfiles/files/roblox-models-that-give-free-robux_GM431946152.pdfIn PDF document text
    • http://www.biotrade.com.au/uploaded_files/userfiles/files/minecraft-account-hacked_GM479516143.pdfIn PDF document text
    • http://www.biotrade.com.au/uploaded_files/userfiles/files/hacking-apps-for-roblox_GM431946152.pdfIn PDF document text
    • http://www.biotrade.com.au/uploaded_files/userfiles/files/coin-master-hack-fast-org_GM406889139.pdfIn PDF document text
    • http://www.biotrade.com.au/uploaded_files/userfiles/files/coin-master-fan_GM406889139.pdfIn PDF document text
    • http://www.biotrade.com.au/uploaded_files/userfiles/files/roblox-how-to-change-your-name-with-cheat-engine_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 6

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000033d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x33D1 21940 bytes
SHA-256: 6fcbc853f9f0cd387c6258f76e2406cb892dfa68a4b5bf39089310f5f2746ddc
font_01_sfnt_off0000645e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x645E 19152 bytes
SHA-256: f3a7fbe2fd1a399547b27f833653b29eff15323a077d1d478ae58e8e8daf514b

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