Malicious PDF — malware analysis report

Static analysis result for SHA-256 d28fa963c95a366c…

MALICIOUS

PDF

34.6 KB Created: 2021-07-07 13:53:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 6fae9800fb2c4450bb5274b7b93afe73 SHA-1: 280936fb8ab11bc42f7da837857240b89a14646e SHA-256: d28fa963c95a366c4fcf150498e93807719aa19b53f5964ef63c05b16fa081f1
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'free Robux' and game hacks. The primary lure URL is http://netcdn.tw/app/431946152/free-robux-just-enter-username-game-hack, which is flagged as a known malicious redirector. The document body and embedded URLs reinforce this theme, indicating a phishing or scam attempt designed to lead users to potentially harmful sites.

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/431946152/free-robux-just-enter-username-game-hack In PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/free-robux-websites-2021_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/coin-master-free-spins-hack-link_GM406889139.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/roblox-spiel-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/roblox-arsenal-hacks-download_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/free-roblox-cards-youtube_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/haktuts-coin-master_GM406889139.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/daily-coin-master_GM406889139.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/free-roblox-accounts-with-passwords-2021_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/download-minecraft-java-edition-free_GM479516143.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/roblox-jailbreak-how-to-get-all-cars-free_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/card-hack-in-coin-master_GM406889139.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/coin-master-free-coins-link-march-2021_GM406889139.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/free-robux-no-offers_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/free-coins-and-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/coinmaster-links_GM406889139.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/minecraft-server-hacks_GM479516143.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/robux-hack-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/free-robux-promo-codes-for-roblox_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • https://cnc-xinrong.com.tw/image/data/files/roblox-free-bundles_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_off00002fbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FBC 22384 bytes
SHA-256: 87a319c0a8bcd1136e1f0c5fe53a680c15ae961f290ccca1b45b2874cd04fd30
font_01_sfnt_off000061a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61A3 19244 bytes
SHA-256: bb42f0e36b7288fba8af59efb142b286361a630cbb1699ef387bab73f1413400

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