Malicious PDF — malware analysis report

Static analysis result for SHA-256 49c6520bbb9a18d6…

MALICIOUS

PDF

49.2 KB Created: 2021-06-03 22:49:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 950d706f8ef52324dbf0718e0767b8c3 SHA-1: 1911309d08d1e3c9d4e5382fe17f25437d7921d3 SHA-256: 49c6520bbb9a18d62d2575d4816ddc42d9fac505f2de3846a485457e2e466a0b
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 0.9796

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.online/app/431946152/roblox-free-hats-game-hack PDF link annotation
    • http://pustaka.biologi.fmipa.unand.ac.id/repository/link-for-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.biologi.fmipa.unand.ac.id/repository/minecraft-bedrock-edition-pc-download-free_GM479516143.pdfIn PDF document text
    • http://pustaka.biologi.fmipa.unand.ac.id/repository/how-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.biologi.fmipa.unand.ac.id/repository/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • http://pustaka.biologi.fmipa.unand.ac.id/repository/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.biologi.fmipa.unand.ac.id/repository/coin-master-free-cards_GM406889139.pdfIn PDF document text
    • http://pustaka.biologi.fmipa.unand.ac.id/repository/free-spin-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://pustaka.biologi.fmipa.unand.ac.id/repository/coin-master-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://pustaka.biologi.fmipa.unand.ac.id/repository/easy-ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.biologi.fmipa.unand.ac.id/repository/free-ways-to-get-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.biologi.fmipa.unand.ac.id/repository/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.biologi.fmipa.unand.ac.id/repository/is-minecraft-education-edition-free_GM479516143.pdfIn PDF document text
    • http://pustaka.biologi.fmipa.unand.ac.id/repository/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://pustaka.biologi.fmipa.unand.ac.id/repository/free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.biologi.fmipa.unand.ac.id/repository/codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.biologi.fmipa.unand.ac.id/repository/roblox-land-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.biologi.fmipa.unand.ac.id/repository/free-robux-survey_GM431946152.pdfIn PDF document text
    • http://pustaka.biologi.fmipa.unand.ac.id/repository/how-to-get-free-robux-fast-and-easy_GM431946152.pdfIn PDF document text
    • http://pustaka.biologi.fmipa.unand.ac.id/repository/how-to-get-free-robux-2021-youtube_GM431946152.pdfIn PDF document text
    • http://pustaka.biologi.fmipa.unand.ac.id/repository/free-robux-no-human-verification-or-survey-2021_GM431946152.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
font_00_sfnt_off000053a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x53A6 26612 bytes
SHA-256: 1a00d04c8e4fec0f3cb7b06df2db8ca9fce5e1576ee689c86dc93c0ae7e5e428
font_01_sfnt_off00009035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9035 4088 bytes
SHA-256: c0bcf44f6bcaea43981dd8f677c5ef69c1b5279d7b6725972b2322822a734204
font_02_sfnt_off00009d84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9D84 18280 bytes
SHA-256: d79b24007103f0b8771e10b039c1f7207970f223f4181a99123e56d5497ad133

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