Malicious PDF — malware analysis report

Static analysis result for SHA-256 481fd465707a6ef8…

MALICIOUS

PDF

34.7 KB Created: 2021-07-06 01:07:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 52de45152036e75382ea4d2e47240e6a SHA-1: 764fd8322b84c83e0c0fa17825ea0a45ca3371d5 SHA-256: 481fd465707a6ef840253f751d735562d50f4b4634956efaabeeec4755933d70
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to a known malicious domain, masquerading as a game hack generator. The ML classifier also flagged this PDF as malicious with high confidence. The presence of multiple links to similar lures suggests a phishing or scam campaign.

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.tw/app/406889139/coin-master-free-pin-game-hack In PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/coin-master-free-spins-link-blogspot-2021_GM406889139.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/rape-simulator_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/coin-master-hack-tool-pc-download_GM406889139.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/coin-master-free-gift-link-2021_GM406889139.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/minecraft-bedrock-download-pc-free_GM479516143.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/ssunset-city-how-to-get-free-money-roblox_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/roblox-whatever-floats-your-boat-level-hack_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/free-robux-no-verification-no-download_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/roblox-data-breach_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/how-to-get-the-roblox-20-body-for-free_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/bloxpink-free-robux_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/how-to-get-clothes-for-free-roblox_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/minecraft-for-chromebook-free_GM479516143.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/how-do-you-make-tshirts-free-roblox_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/free-robux-hack-2021-april_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/how-do-u-hack-roblox_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/is-tiktok-free_GM835599320.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/roblox-hack-free-no-human-verification_GM431946152.pdfIn PDF document text
    • https://healthcare.kyst.com.tw/image/data/files/roblox-apocalypse-rising-hack_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
font_00_sfnt_off0000317a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x317A 23236 bytes
SHA-256: 34f002194a01ec8742ea0ef47c45b329a76efc139e622ee5417d722c13f4bad3
font_01_sfnt_off0000656e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x656E 18152 bytes
SHA-256: dc9279c8f9ffb77b5b0b20899b1012281909b59fa7ee038540f0424ab4b7db6e

Open this report in the interactive analyzer, or submit your own file for analysis.