Malicious PDF — malware analysis report

Static analysis result for SHA-256 0984a96f7f957e9a…

MALICIOUS

PDF

44.3 KB Created: 2021-05-17 02:45:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 775332f194ea6f69e5548f367ee7b6d6 SHA-1: 8686be5592b381e353bce9d5f221011c32273a06 SHA-256: 0984a96f7f957e9a7bdca6027d347ea4694737666c6a257420c1ee1fde50d7fc
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains numerous links to external websites, many of which are hosted on domains associated with link farms and SEO manipulation. The primary lure appears to be 'game hacks' and 'free currency' for popular games like Coin Master and Roblox. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of outbound links, suggesting a malicious intent to redirect users to potentially harmful sites. While no scripts were directly extracted, the PDF structure and embedded links strongly suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9648

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/406889139/coin-master-hack-no-survey-game-hack PDF link annotation
    • https://diendientuvn.com/public/upload/files/free-minecraft-mods-for-pc_GM479516143.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/coin-master-unlimited-free-spins_GM406889139.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/free-minecraft-windows-10-with-java_GM479516143.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/claimrbx-free-robux_GM431946152.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/hack-coin-master-free_GM406889139.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/roblox-mobile-hack_GM431946152.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/how-to-hack-any-roblox-account_GM431946152.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/roblox-royale-high-diamond-hack_GM431946152.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/free-robux-generator-no-verification_GM431946152.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/free-robux-real-2021_GM431946152.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/coin-master-free-card-link-today_GM406889139.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/daily-free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/who-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/get-free-robux-now_GM431946152.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/get-free-coin-master_GM406889139.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/coin-master-free-redeem-code_GM406889139.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/free-role-in-coin-master_GM406889139.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/free-robux-app_GM431946152.pdfIn PDF document text
    • https://diendientuvn.com/public/upload/files/coin-master-free-spins-daily_GM406889139.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
stream_003_off00004947.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4947 24348 bytes
SHA-256: fe46ee30ecf2416fb842943eb8b556c28c9c917c2710006b82a48882baa5ef3a
font_01_sfnt_off00008113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8113 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00008ac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AC4 18148 bytes
SHA-256: 55a2c5e1b7f94918972dbf36de35b773a73c2c126b1f6e018f905b5ffe646750

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