Malicious PDF — malware analysis report

Static analysis result for SHA-256 efe5f42a3b9c1ecf…

MALICIOUS

PDF

34.5 KB Created: 2021-06-20 06:06:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: d169e2e390c8fa468acaa4d515637c1a SHA-1: 15fb29273c84f7c3d0a6cf262951d3a4d3b6a8f6 SHA-256: efe5f42a3b9c1ecf4015f12c4215ca1a1d4e1926d65dd66aa279607567fd925d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that lead to a known malicious redirector, disguised as a 'game hack' or 'free generator' lure. The ML classifier also strongly indicated maliciousness. The primary URL, http://netcdn.co/app/431946152/hack-robar-c-uentas-de-roblox-akaka-game-hack, is the most critical IOC as it is the direct target of the lure.

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/hack-robar-c-uentas-de-roblox-akaka-game-hack In PDF document text
    • https://www.99champions.com/uploaded_files/userfiles/files/coin-master-game-free-download-for-pc_GM406889139.pdfIn PDF document text
    • https://www.99champions.com/uploaded_files/userfiles/files/how-to-get-free-robux-without-verifying_GM431946152.pdfIn PDF document text
    • https://www.99champions.com/uploaded_files/userfiles/files/coin-master-free-spin-whatsapp-group_GM406889139.pdfIn PDF document text
    • https://www.99champions.com/uploaded_files/userfiles/files/easy-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.99champions.com/uploaded_files/userfiles/files/coin-master-free-spins-app_GM406889139.pdfIn PDF document text
    • https://www.99champions.com/uploaded_files/userfiles/files/roblox-free-clothes-girl_GM431946152.pdfIn PDF document text
    • https://www.99champions.com/uploaded_files/userfiles/files/how-to-get-free-food-for-foxy-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.99champions.com/uploaded_files/userfiles/files/free-pet-treats-coin-master_GM406889139.pdfIn PDF document text
    • https://www.99champions.com/uploaded_files/userfiles/files/hacked-client-for-minecraft-bedrock_GM479516143.pdfIn PDF document text
    • https://www.99champions.com/uploaded_files/userfiles/files/minecraft-logo-maker-free_GM479516143.pdfIn PDF document text
    • https://www.99champions.com/uploaded_files/userfiles/files/easy-roblox-today_GM431946152.pdfIn PDF document text
    • https://www.99champions.com/uploaded_files/userfiles/files/coin-master-hack-spins-free_GM406889139.pdfIn PDF document text
    • https://www.99champions.com/uploaded_files/userfiles/files/coin-master-free-download-app_GM406889139.pdfIn PDF document text
    • https://www.99champions.com/uploaded_files/userfiles/files/free-cheat-codes-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.99champions.com/uploaded_files/userfiles/files/free-minecraft-capes_GM479516143.pdfIn PDF document text
    • https://www.99champions.com/uploaded_files/userfiles/files/tiktok-for-free_GM835599320.pdfIn PDF document text
    • https://www.99champions.com/uploaded_files/userfiles/files/coin-master-links-free-spins_GM406889139.pdfIn PDF document text
    • https://www.99champions.com/uploaded_files/userfiles/files/minecraft-free-download-mac_GM479516143.pdfIn PDF document text
    • https://www.99champions.com/uploaded_files/userfiles/files/real-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.99champions.com/uploaded_files/userfiles/files/free-robux-websites-that-work_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_002_off00002fc1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2FC1 22476 bytes
SHA-256: 7228e7d4232ff068fef2456b77c69a76d7112bf497e7d50ae3f7672689636a36
font_01_sfnt_off000061f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61F1 18928 bytes
SHA-256: 082b2a2693345d07a5733b7c7c437f1a53f2c9c21f67e75c87ca7ba73960625e

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