Malicious PDF — malware analysis report

Static analysis result for SHA-256 70e28020e3009da0…

MALICIOUS

PDF

43.1 KB Created: 2021-05-19 09:36:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 87490217983fe9fb7a8629decc4b233e SHA-1: 1e1835e922285f437a1e388e9f10c5f15f1c40c9 SHA-256: 70e28020e3009da06065f0a00de0d9d9ac282d6f5a3de246b8ef2f8c1fbad7d6
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 0.9971

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.xyz/app/431946152/free-robux-for-kids-no-verification-game-hack PDF link annotation
    • https://yontemakademi.com.tr/public/uploads/files/robux-online_GM431946152.pdfIn PDF document text
    • https://yontemakademi.com.tr/public/uploads/files/how-to-get-100-robux-for-free_GM431946152.pdfIn PDF document text
    • https://yontemakademi.com.tr/public/uploads/files/free-downloads-for-coin-master-daily-rewards_GM406889139.pdfIn PDF document text
    • https://yontemakademi.com.tr/public/uploads/files/how-do-i-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://yontemakademi.com.tr/public/uploads/files/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://yontemakademi.com.tr/public/uploads/files/how-to-get-free-robux-for-kids_GM431946152.pdfIn PDF document text
    • https://yontemakademi.com.tr/public/uploads/files/coin-master-free-spins-link-ios_GM406889139.pdfIn PDF document text
    • https://yontemakademi.com.tr/public/uploads/files/free-robux-live_GM431946152.pdfIn PDF document text
    • https://yontemakademi.com.tr/public/uploads/files/how-to-get-free-robux-on-iphone_GM431946152.pdfIn PDF document text
    • https://yontemakademi.com.tr/public/uploads/files/is-minecraft-free_GM479516143.pdfIn PDF document text
    • https://yontemakademi.com.tr/public/uploads/files/free-role-in-coin-master_GM406889139.pdfIn PDF document text
    • https://yontemakademi.com.tr/public/uploads/files/minecraft-apk-114_GM479516143.pdfIn PDF document text
    • https://yontemakademi.com.tr/public/uploads/files/coin-master-daily-spin-link-app_GM406889139.pdfIn PDF document text
    • https://yontemakademi.com.tr/public/uploads/files/coin-master-hack-generator-tool_GM406889139.pdfIn PDF document text
    • https://yontemakademi.com.tr/public/uploads/files/noob-vs-pro-vs-hacker-vs-god-minecraft_GM479516143.pdfIn PDF document text
    • https://yontemakademi.com.tr/public/uploads/files/free-robux-gift-card-codes_GM431946152.pdfIn PDF document text
    • https://yontemakademi.com.tr/public/uploads/files/coin-master_GM406889139.pdfIn PDF document text
    • https://yontemakademi.com.tr/public/uploads/files/where-to-get-free-tiktok-likes_GM835599320.pdfIn PDF document text
    • https://yontemakademi.com.tr/public/uploads/files/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://yontemakademi.com.tr/public/uploads/files/get-me-robux-for-free_GM431946152.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_003_off00004af5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AF5 24888 bytes
SHA-256: 08fdb2ff4371b2e0c507cffbdd259cee2001da67ce1ce5f997bc66532f5e87d0
font_01_sfnt_off00008493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8493 18776 bytes
SHA-256: abcd165e4b695e85902e5e0162dd8c883b494cae8faf27dbfb1f0dc34095f980

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