Malicious PDF — malware analysis report

Static analysis result for SHA-256 57830cd51051d1a1…

MALICIOUS

PDF

34.2 KB Created: 2021-06-29 08:39:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 234f617eb33feb6c48fea4238f5e0dcf SHA-1: d284f6c93bd7860091f262024ac4f827d8491c31 SHA-256: 57830cd51051d1a183ae92686e444ac05b7a46730455a305d9e09c6b11880638
160 Risk Score

Malware Insights

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

This PDF document employs a lure for free game currency or hacks, directing users to a malicious redirector. The redirector, in turn, serves further malicious PDF files hosted on `key8013805.com.tw`. The ML classifier strongly indicates maliciousness, and the embedded URLs confirm a pattern of redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/roblox-free-draw-discord-game-hack In PDF document text
    • https://key8013805.com.tw/upload/files/free-robux-roblox-wiki_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/robux-codes_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/robux-matchcomfree-robux_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/robloxheroxyz-free-robux_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/gold-card-coin-master-free_GM406889139.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/exploiting-t-shirt-free-roblox_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/coin-master-free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/cheat-engine-63-roblox-hacks_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/how-can-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/coin-master-spin-free_GM406889139.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/roblox-hack-me-com_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/minecraft-realms-free-trial_GM479516143.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/pubg-uc-vn_GM1330123889.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/coin-master-hacks-reddit_GM406889139.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/coin-master-facebook-hack_GM406889139.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/how-to-hack-roblox-to-get-robux-2021_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/how-to-use-a-script-hack-roblox-game_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/coin-master-daily-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 7

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
font_00_sfnt_off00002df6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DF6 22340 bytes
SHA-256: f1b7f0947e703be30abe60844bb91ddab39c0300079a484fbffc27abe4c3203b
font_01_sfnt_off00005ff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FF5 19276 bytes
SHA-256: 1837606bceeef81fc8b407af2b6c1953e56d0391417688802fb049b4b3873350

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