Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcd52f26197c3bc5…

MALICIOUS

PDF

35.1 KB Created: 2021-07-07 02:34:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 7a4ccbe9c672cc6774224be858ac1a83 SHA-1: 0adf647a7d8b896171f619ca335ba3b65cf78fc4 SHA-256: fcd52f26197c3bc57e2de4454ae15dc60f9a96220e5bbc2f07f1282f0ff14fb1
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a high-confidence heuristic indicating it links to a game hack lure, specifically targeting users interested in Coin Master and Roblox. The embedded URL http://netcdn.tw/app/406889139/fan-page-coin-master-game-hack is the primary indicator of malicious intent, likely serving as a redirector to a phishing page or a download for malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest a social engineering attack to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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 http://netcdn.tw/app/406889139/fan-page-coin-master-game-hack PDF link annotation
    • https://www.cow-style.com.tw/upload/files/how-to-get-free-robux-by-joining-groups_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/how-to-get-free-robux-on-roblox-no-survey_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/roblox-hack-stealing-items_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/wearedevs-roblox-exploits-and-hacks-amp_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/coin-master-generator-hack_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/cheats-for-the-tales-of-the-ranges-cape-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/how-to-get-1-million-robux-hack_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/easy-hack-roblox_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/free-minecraft-server-maker_GM479516143.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/coin-master-hack-online-2021_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/coin-master-hack-version-download-2021_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/fbchampion-com_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/earn-robux-today_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/roblox-items-that-you-can-get-for-free-right-now_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/free-robux-download_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/roblox-hack-no-human-verification-free_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/free-roblox-trump-shirt_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/minecraft-apk-free-download_GM479516143.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/minecraft-apk-114-4_GM479516143.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_002_off000032cd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x32CD 23300 bytes
SHA-256: 930f469ffd007b738adb8790b540613acbdaffdf7313901f0fb3f645422229f9
font_01_sfnt_off0000671b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x671B 18152 bytes
SHA-256: dc65fc03521f6741f12ad44add688acee0e4503760684e09f17d44e8145a27b5

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