Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bae31beebd44298…

MALICIOUS

PDF

35.5 KB Created: 2021-06-20 01:22:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 084d97ca89df7462fa4b106b93efe099 SHA-1: 69cbdbd27e9223e02be1804d092c591d044d6325 SHA-256: 4bae31beebd442981ba6f3ef49f106c45f954c68aa58c000def35925f28018c1
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a critical heuristic firing for a game hack redirect lure, pointing to malicious infrastructure. The embedded URL and document body text both promote a 'free Robux generator' and link to the suspicious domain 'netcdn.co'. This indicates a phishing attempt to trick users into visiting a malicious site.

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/free-robux-generator-2021-no-app-download-game-hack In PDF document text
    • https://nature-air.com.tw/upload/files/free-robux-websites-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/roblox-meep-city-hacks_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/how-do-you-hack-roblox_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/coin-master-free-spins-glitch_GM406889139.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/free-robux-place_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/claim-free-robux-button_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/roblox-skin-editor-free_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/coin-master-game-android-free-download_GM406889139.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/free-exploit-kits-for-roblox_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/blox-fish-free-robux_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/coin-master-34-4-hack-download_GM406889139.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/free-hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/free-coin-master-hacks-no-verification-or-survey_GM406889139.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/minecraft-hacks-wurst_GM479516143.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/free-robux-generator_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/coin-master-rewards-free-spins_GM406889139.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/free-headless-head-roblox_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/roblox-adopt-me-hack_GM431946152.pdfIn PDF document text
    • https://nature-air.com.tw/upload/files/roblox-free-pants_GM431946152.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_off00003138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3138 22436 bytes
SHA-256: 8e6b2c6a99443e1b5e2c6118d27ea9c4c5bd810948a8d3035316bfd2f98ac8b4
font_01_sfnt_off000062de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62DE 19976 bytes
SHA-256: 10cb2d2671b8fe4b43a623c60a47bdacacdb457200974974dbc2cfbc20357ea5

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