Malicious PDF — malware analysis report

Static analysis result for SHA-256 92899dec56d5d38a…

MALICIOUS

PDF

34.6 KB Created: 2021-06-26 14:58:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 0031a38f34a7be6e5ba6daa5a0711e9e SHA-1: df51649675acf6184226d1aaea66549eeb3356f5 SHA-256: 92899dec56d5d38aa4b7f7773e4055f0735b39d84d9e2bf3818c31cbce5eb3eb
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one to 'netcdn.co', which is identified as malicious infrastructure. The document body and embedded links suggest a lure for "Roblox Accont Hacking" and "Robux Generator" scams, aiming to trick users into visiting potentially harmful sites. The presence of embedded URLs and the ML classifier's high confidence score support this assessment.

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.co/app/431946152/roblox-accont-hacking-game-hack In PDF document text
    • https://razredna-nastava.net/files/free-spins-coin-master-app-iphone_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/minecraft-realms-free_GM479516143.pdfIn PDF document text
    • http://razredna-nastava.net/files/robux-hack_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/coin-master-daily-bonus_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/microsoft-bing-free-robux_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/best-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://razredna-nastava.net/files/free-robux-redeem-codes_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/how-to-get-free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/how-to-get-free-robux-on-ipad_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/uprobuxcom-free-robux_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/free-robux-no-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/coin-master-free-spin-whatsapp-group-link_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/free-script-executor-roblox_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/free-rich-roblox-account-2021_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/pokemon-go-free-km_GM1094591345.pdfIn PDF document text
    • https://razredna-nastava.net/files/how-to-hack-coin-master-with-game-guardian_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/how-to-make-a-modded-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://razredna-nastava.net/files/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/freerobuxhack-us-2021_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/how-to-get-clothes-for-free-roblox_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000030f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30F6 22300 bytes
SHA-256: bfe7c41b17cda4d5ce7fc572c5f155e5a39d1a37292a84da31c58a5782d4d7b5
font_01_sfnt_off0000627a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x627A 18880 bytes
SHA-256: a975c28a6d0f5a5f4cc177d40952425fed838629db6a735ba7645903db42e25b

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