Malicious PDF — malware analysis report

Static analysis result for SHA-256 187ad97cdf2c92c0…

MALICIOUS

PDF

44.1 KB Created: 2021-06-07 19:54:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 6e1d68bb78ad91da1afeac724e3a9bc4 SHA-1: e2d8bb4dd816ae1e78a146cb788f5e355d116c1f SHA-256: 187ad97cdf2c92c0f2a1105e93b1e6512b897888157ca59922d2d26599933331
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a common lure of free in-game currency and hacks to entice users. It contains a high number of external links, many pointing to other PDF documents, suggesting a link farm designed to drive traffic. The primary URL, https://netcdn.tw/app/431946152/real-free-tix-and-robux-game-hack, is likely a redirector to malicious content. No scripts were extracted, but the document's structure and content strongly indicate a phishing or scam attempt.

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/real-free-tix-and-robux-game-hack PDF link annotation
    • https://cosmosocean.com.tw/upload/files/free-coin-master-spins-and-coins-for-daily_GM406889139.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/coin-master-hack-apk-ios-download_GM406889139.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/free-spins-and-coins-coin-master-app_GM406889139.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/coin-master-free-spins-for-iphone_GM406889139.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/how-to-get-free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/free-coin-master-coins-2021_GM406889139.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/robux-hack-tools_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/minecraft-dungeons-free-download-pc_GM479516143.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/free-robux-earn_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/free-roblox-accounts-2021-with-robux_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/coin-master-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/free-robux-easy-and-fast_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/minecraft-mods-download-free_GM479516143.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/minecraft-free-apk-java-edition_GM479516143.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/i-want-robux_GM431946152.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/how-to-get-free-chest-in-coin-master_GM406889139.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/coin-master-village-4_GM406889139.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/coin-master-daily-free-spins-link_GM406889139.pdfIn PDF document text
    • https://cosmosocean.com.tw/upload/files/how-to-hack-coin-master-spin-in-hindi_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

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
stream_004_off00005021.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5021 25104 bytes
SHA-256: 7e6ffa4934c37c61b3ce3ee781f86b6a11c9b1195ef5165d21f50982bedf4ce6
font_01_sfnt_off000088ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88AE 18608 bytes
SHA-256: 954369959e9669078e3163e0a986b82620bd18c85fba59a4fba436e61d4105be

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