Malicious PDF — malware analysis report

Static analysis result for SHA-256 55afb2fff7f49cee…

MALICIOUS

PDF

34.2 KB Created: 2021-07-07 18:59:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 71f133828af16c06250423158ea57f9b SHA-1: c70830d552180254cd69ccb8786afcd7e606fd54 SHA-256: 55afb2fff7f49ceec8857ae9803361c599be2cc50a6e464fa3e38f08785e62dd
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to known malicious redirectors, masquerading as 'game hacks' and 'free robux' generators. The primary lure directs users to 'http://netcdn.tw/app/431946152/cpbildco-robux-game-hack', which is identified as malicious infrastructure. The document's structure and embedded URLs suggest it is designed to trick users into downloading further malicious content or visiting phishing sites. No scripts were extracted, but the PDF's nature points towards a social engineering attack.

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/cpbildco-robux-game-hack In PDF document text
    • https://www.espritroue.fr/ckfinder/userfiles/files/roblox-hackeado-con-robux-infinitos_GM431946152.pdfIn PDF document text
    • https://www.espritroue.fr/ckfinder/userfiles/files/coin-master-hack-mod-apk-free-download_GM406889139.pdfIn PDF document text
    • https://www.espritroue.fr/ckfinder/userfiles/files/minecraft-toys-for-free_GM479516143.pdfIn PDF document text
    • https://www.espritroue.fr/ckfinder/userfiles/files/roblox-hack-unlimited-robux_GM431946152.pdfIn PDF document text
    • https://www.espritroue.fr/ckfinder/userfiles/files/tiktok-free-like-app_GM835599320.pdfIn PDF document text
    • https://www.espritroue.fr/ckfinder/userfiles/files/how-to-get-free-robux-without-surveys_GM431946152.pdfIn PDF document text
    • https://www.espritroue.fr/ckfinder/userfiles/files/roblox-hack-app_GM431946152.pdfIn PDF document text
    • https://www.espritroue.fr/ckfinder/userfiles/files/tiktok-free-no-sign-in_GM835599320.pdfIn PDF document text
    • https://www.espritroue.fr/ckfinder/userfiles/files/minecraft-hacks-xbox-one_GM479516143.pdfIn PDF document text
    • https://www.espritroue.fr/ckfinder/userfiles/files/daily-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.espritroue.fr/ckfinder/userfiles/files/how-to-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.espritroue.fr/ckfinder/userfiles/files/coin-master-free-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • https://www.espritroue.fr/ckfinder/userfiles/files/roblox-website-robux_GM431946152.pdfIn PDF document text
    • https://www.espritroue.fr/ckfinder/userfiles/files/script-executor-roblox-free_GM431946152.pdfIn PDF document text
    • https://www.espritroue.fr/ckfinder/userfiles/files/guess-that-character-for-free-robux_GM431946152.pdfIn PDF document text
    • https://www.espritroue.fr/ckfinder/userfiles/files/how-to-get-free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • https://www.espritroue.fr/ckfinder/userfiles/files/free-supreme-roblox_GM431946152.pdfIn PDF document text
    • https://www.espritroue.fr/ckfinder/userfiles/files/get-free-builders-club-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://www.espritroue.fr/ckfinder/userfiles/files/roblox-free-robux-scam-discord_GM431946152.pdfIn PDF document text
    • https://www.espritroue.fr/ckfinder/userfiles/files/free-minecraft-generator_GM479516143.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_off00002df7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DF7 22552 bytes
SHA-256: 9cf5db4aa5fcb1bf92cf806601d0e7512a131f8b216d511525a1c396d6f50c18
font_01_sfnt_off00006085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6085 19096 bytes
SHA-256: 3774e2cd1dca270d4381be7f0b5b05bd650ad330201d58729471f58c3aaeab14

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