Malicious PDF — malware analysis report

Static analysis result for SHA-256 f475da0632407320…

MALICIOUS

PDF

33.5 KB Created: 2021-07-05 16:42:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: e2f598b092a0f187163d16216eeed0cd SHA-1: 99ac0751855daa7736d356d724a40c83dbb11663 SHA-256: f475da0632407320d48fd8fcf10ec093b143f328a23f18107966d01639e377b3
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to redirector domains and other PDF files, masquerading as 'free generators' or 'game hacks'. The primary redirector URL is http://netcdn.tw/app/431946152/free-robux-without-verification-or-survey-game-hack, which is flagged as malicious. The document body and embedded URLs strongly suggest a social engineering lure to trick users into visiting potentially harmful sites or downloading further malware. No scripts were extracted, but the PDF structure and links are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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-without-verification-or-survey-game-hack In PDF document text
    • http://charivne.info/ckfinder/userfiles/files/roblox-how-to-get-free-obc-2021_GM431946152.pdfIn PDF document text
    • http://charivne.info/ckfinder/userfiles/files/can-i-get-robux-for-free_GM431946152.pdfIn PDF document text
    • http://charivne.info/ckfinder/userfiles/files/roblox-studio-free-download_GM431946152.pdfIn PDF document text
    • http://charivne.info/ckfinder/userfiles/files/roblox-toy-codes-free_GM431946152.pdfIn PDF document text
    • http://charivne.info/ckfinder/userfiles/files/coin-master-hack-no-verification_GM406889139.pdfIn PDF document text
    • http://charivne.info/ckfinder/userfiles/files/earn-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://charivne.info/ckfinder/userfiles/files/how-to-get-free-robux-wiki_GM431946152.pdfIn PDF document text
    • http://charivne.info/ckfinder/userfiles/files/roblox-generator_GM431946152.pdfIn PDF document text
    • http://charivne.info/ckfinder/userfiles/files/free-100-robux-2021_GM431946152.pdfIn PDF document text
    • http://charivne.info/ckfinder/userfiles/files/free-robux-app_GM431946152.pdfIn PDF document text
    • http://charivne.info/ckfinder/userfiles/files/best-roblox-free-skins_GM431946152.pdfIn PDF document text
    • http://charivne.info/ckfinder/userfiles/files/free-robux-without-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://charivne.info/ckfinder/userfiles/files/free-minecraft-videos_GM479516143.pdfIn PDF document text
    • http://charivne.info/ckfinder/userfiles/files/free-coins--spins-coin-master_GM406889139.pdfIn PDF document text
    • http://charivne.info/ckfinder/userfiles/files/roblox-hack-robux-apk_GM431946152.pdfIn PDF document text
    • http://charivne.info/ckfinder/userfiles/files/wurst-112-2_GM479516143.pdfIn PDF document text
    • http://charivne.info/ckfinder/userfiles/files/coin-master-game-2021-free-spin-link_GM406889139.pdfIn PDF document text
    • http://charivne.info/ckfinder/userfiles/files/can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://charivne.info/ckfinder/userfiles/files/how-to-hack-coin-master-apkmody_GM406889139.pdfIn PDF document text
    • http://charivne.info/ckfinder/userfiles/files/apps-to-get-free-robux_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_off00002b02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B02 22068 bytes
SHA-256: 5af50b78eef6a4efc14da9cdb031edefad5e702e910c42b2036da0f01ff41233
font_01_sfnt_off00005bfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5BFE 19732 bytes
SHA-256: 2b0675f33db550cd9a8e3dc1ba0bd2c431e10f6529817ff9c59fda3edd6e12a5

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