Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4db988a8f30bb87…

MALICIOUS

PDF

43.1 KB Created: 2021-05-15 10:13:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 857e67c40cb9b571f91ad1af2ad98c4d SHA-1: 6a1a9221495c172f2bec8e3d5769828b0cfbfcc0 SHA-256: f4db988a8f30bb876f5b4547051876112416ebc504abf8f120c7528543dda739
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to known malicious infrastructure, specifically promoting game hacks and cheats. The presence of a "download button" heuristic and the ML classifier's high confidence score indicate a malicious intent to trick users into visiting these sites. No scripts were extracted, but the document's structure and embedded URLs strongly suggest a phishing or social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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-tool-india-game-hack In PDF document text
    • https://www.ruchya.com.tw/upload/files/roblox-account-hacker-tool_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/how-to-get-a-lot-of-robux_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/coin-master-daily-free-spins-link-download_GM406889139.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/mistplay-robux_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/free-roblox-clothes-codes_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/coin-master-free-spins-link-no-verification-2021_GM406889139.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/roblox-pics_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/coin-master-hack-game-download-ios_GM406889139.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/coin-master-level-4_GM406889139.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/minecraft-bedrock-edition-hacks_GM479516143.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/coin-master-links-2021_GM406889139.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/free-robux-2021-no-verification_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/free-minecraft-bedrock_GM479516143.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/coin-master-free-spin-reward-links_GM406889139.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/free-minecraft-account-and-password-2021_GM479516143.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/how-to-make-your-own-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/how-to-get-free-robux-without-verifying-2021_GM431946152.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_003_off00004dfb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4DFB 24988 bytes
SHA-256: e5c7b0101f44c9e9f61896cac0c3850c30f1325a848c71423922148d7ed76d37
font_01_sfnt_off00008717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8717 17964 bytes
SHA-256: f7ba37ddd686d5a2ef568917c91d22d49885194068cf0b1b41d29a63968e1f2e

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