Malicious PDF — malware analysis report

Static analysis result for SHA-256 391474e3445ab3f5…

MALICIOUS

PDF

43.0 KB Created: 2021-05-19 19:00:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 40f1611beab73488e2a2f4ee37ff017f SHA-1: 066004c737b67cffee2aceebaa4ecc4607f49659 SHA-256: 391474e3445ab3f5c229c2779032467f79dc2353921ef6400324f882724d03e6
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically promoting 'free generators' and 'game hacks' to lure users. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a phishing or scam attempt, likely leading to further malicious content or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://netcdn.xyz/app/431946152/dailyrobux-game-hack In PDF document text
    • http://visti.rovno.ua/ckfinder/userfiles/files/mcpe-download_GM479516143.pdfIn PDF document text
    • http://visti.rovno.ua/ckfinder/userfiles/files/free-robux-gift-card-codes_GM431946152.pdfIn PDF document text
    • http://visti.rovno.ua/ckfinder/userfiles/files/promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • http://visti.rovno.ua/ckfinder/userfiles/files/roblox-jailbreak-hack_GM431946152.pdfIn PDF document text
    • http://visti.rovno.ua/ckfinder/userfiles/files/free-robux-easy_GM431946152.pdfIn PDF document text
    • http://visti.rovno.ua/ckfinder/userfiles/files/free-daily-coin-master-coins_GM406889139.pdfIn PDF document text
    • http://visti.rovno.ua/ckfinder/userfiles/files/free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • http://visti.rovno.ua/ckfinder/userfiles/files/moonactive-free-spins_GM406889139.pdfIn PDF document text
    • http://visti.rovno.ua/ckfinder/userfiles/files/how-to-get-more-robux_GM431946152.pdfIn PDF document text
    • http://visti.rovno.ua/ckfinder/userfiles/files/do-you-get-windows-10-minecraft-for-free-with-java_GM479516143.pdfIn PDF document text
    • http://visti.rovno.ua/ckfinder/userfiles/files/jailbreak-roblox-hack_GM431946152.pdfIn PDF document text
    • http://visti.rovno.ua/ckfinder/userfiles/files/coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://visti.rovno.ua/ckfinder/userfiles/files/free-robux-apk_GM431946152.pdfIn PDF document text
    • http://visti.rovno.ua/ckfinder/userfiles/files/how-to-earn-free-stars-on-coin-master_GM406889139.pdfIn PDF document text
    • http://visti.rovno.ua/ckfinder/userfiles/files/blox-best-robux_GM431946152.pdfIn PDF document text
    • http://visti.rovno.ua/ckfinder/userfiles/files/coin-master-32-mod-hack-unlimited_GM406889139.pdfIn PDF document text
    • http://visti.rovno.ua/ckfinder/userfiles/files/coin-master-free-cards-link-2021-today_GM406889139.pdfIn PDF document text
    • http://visti.rovno.ua/ckfinder/userfiles/files/free-robux-generator_GM431946152.pdfIn PDF document text
    • http://visti.rovno.ua/ckfinder/userfiles/files/free-spins-in-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://visti.rovno.ua/ckfinder/userfiles/files/can-i-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
stream_003_off00004970.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4970 26616 bytes
SHA-256: 832ead03da7b73914182b306e7828b471457656d3b78e6f9ef91ff20dde46cf2
font_01_sfnt_off000084ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84CE 18620 bytes
SHA-256: 006376ad9c7b73d4fd15d3b6dd3ffa9064f0af8ff6d6cdc29d45d1e9c8c3f0f5

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