Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca586a1ae676c345…

MALICIOUS

PDF

44.1 KB Created: 2021-06-09 08:58:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: f7fb5f496c12e0241077e94c61a78d28 SHA-1: d40c1a9f4a4540df8f8733ae526595237e53f7a5 SHA-256: ca586a1ae676c3454a666d9816ebc6b1433d2a431914ae41a8f8377ec0ddcf1e
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 0.9865

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.tw/app/431946152/free-haiir-roblox-game-hack PDF link annotation
    • https://library.uigm.ac.id/repository/minecraft-windows-10-edition-free-download_GM479516143.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/coin-master-hack-version-2021_GM406889139.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/minecraft-skins-free-girl_GM479516143.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/coin-master-ultra-attack-hack_GM406889139.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/how-to-block-someone-on-coin-master_GM406889139.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/cute-free-stuff-on-roblox_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/how-to-get-free-stuff-on-roblox_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/roblox-cheats-for-money-xbox-one_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/free-coin-master-spin-daily-link_GM406889139.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/free-minecraft-bedrock_GM479516143.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/free-robux-stream_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/get-free-lives-on-coin-master_GM406889139.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/descargar-hack-pc-robux_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/coin-master-free-daily-spins-link_GM406889139.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/pixies-gigantic-coin-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/free-printable-minecraft-coloring-pages_GM479516143.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/60-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/coin-master-free-spins-whatsapp-link_GM406889139.pdfIn PDF document text
    • https://library.uigm.ac.id/repository/how-to-get-verified-on-tiktok-for-free-2021_GM835599320.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_004_off00004fee.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FEE 25244 bytes
SHA-256: 48532d0424e37a731d7cca2cdc50519667f79cb415df47c5dfacba91122a0f0a
font_01_sfnt_off000089c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89C6 18296 bytes
SHA-256: a0599e440df83d1220524ed19e510b9c2f6a3db0fbd0aff9e889db947f6eea7b

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