Malicious PDF — malware analysis report

Static analysis result for SHA-256 0349fdb015309caa…

MALICIOUS

PDF

57.3 KB Created: 2021-05-19 04:29:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: c6789614c2c171916a1cb992905b7bd5 SHA-1: 9866a006a6689444e8763771aebda04c7d007bae SHA-256: 0349fdb015309caadc9672e9cdcf4a95959496428ada78f13ac783f82fd5507b
182 Risk Score

Malware Insights

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

This PDF file contains numerous links to external websites, many of which are presented as 'game hacks' or 'free currency generators'. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of such links, suggesting a malicious intent to redirect users to potentially harmful sites. The 'SE_FAKE_CAPTCHA' heuristic further supports this, as it implies a deceptive user interface designed to trick users into clicking links or performing actions. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a lure for users to download further payloads or visit malicious domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7726

Heuristics 6

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/websites-for-robux-game-hack PDF link annotation
    • https://www.cow-style.com.tw/upload/files/adopt-me-roblox-hacks_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/how-to-get-free-robux-easy-2021_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/free-spin-coin-master-ios_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/how-to-get-free-roblox_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/free-spins-for-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/coin-master-free-spins-link-today-ios_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/how-to-get-free-robux-easy-on-phone_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/coin-master-coin-hack_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/i-want-free-robux_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/coin-master-hack-club_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/roblox-fun-com-free-robux_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/coin-master-hack-ios-download-2021_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/how-to-get-free-robux-easy-no-download_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/free-private-minecraft-server_GM479516143.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/roblox-mobile-hack_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/is-there-a-way-to-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/mcpe_GM479516143.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/free-minecraft-bedrock_GM479516143.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/coin-master-codes_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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004a57.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A57 26656 bytes
SHA-256: 5b28b4f643d58cfdb010b18791a5a7f879944a3a9fce8d5ac81a09e7367c1cc6
font_01_sfnt_off00008872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8872 12800 bytes
SHA-256: db399d969d9309c9c38cb6e3c43aa83c06d227a5470715de93176d1df1e6747d
font_02_sfnt_off0000b04a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB04A 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_03_sfnt_off0000bd5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD5C 18436 bytes
SHA-256: a0892a7c6a4df3f32c2c8d55016a82ae07dc296688f989f87a4165413345201d

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