Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5c8231faa00d0ef…

MALICIOUS

PDF

44.8 KB Created: 2021-06-11 04:50:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 01ba7c94c6e27e9f633cc691c38b679a SHA-1: 552793b394d9dc59077a4399269826e908e65b86 SHA-256: e5c8231faa00d0efac495e45e506394572130ac7976fcfd29d60758b25830910
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links designed to lure users into clicking on what appear to be game hack generators or free currency sites. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, many of which point to other PDFs hosted on a suspicious domain. The ML classifier also flagged this PDF as malicious with high confidence. The document body, though partially corrupted, contains text related to 'Como Ganar Robux Sin Hacks', reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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.tw/app/431946152/como-ganar-robux-sin-hacks-game-hack PDF link annotation
    • http://feuerwehr-rheinau.de/images/free-robux-no-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/how-to-get-minecraft-for-free-on-xbox_GM479516143.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/how-to-get-free-robux-for-free-on-pc_GM431946152.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/minecraft-pe-free_GM479516143.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/earn-robux-for-roblox_GM431946152.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/free-robux-no-human-verification-generator_GM431946152.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/minecraft-windows-10-edition-free_GM479516143.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/free-robux-with-no-survey_GM431946152.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/se-puede-hackear-coin-master_GM406889139.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/free-roblox-codes_GM431946152.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/how-to-get-free-robux-2021-easy_GM431946152.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/coin-master-free-spins-usa-2021_GM406889139.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/free-robux-get-com_GM431946152.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/coin-master-hack-no-survey_GM406889139.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/free-minecraft-account-reddit_GM479516143.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/roblox-hacks-2021_GM431946152.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/coin-master-hack-app-download-free_GM406889139.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/coin-master-hack-pro-gamers_GM406889139.pdfIn PDF document text
    • http://feuerwehr-rheinau.de/images/free-card-link-coin-master_GM406889139.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_off00004dd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4DD3 27372 bytes
SHA-256: 561b43691744adf36cab2f3aa524145c70810175b321a7293117d15d7706b9b7
font_01_sfnt_off00008ba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BA4 18628 bytes
SHA-256: e640020b3148c8444c72f3524a721ea83a64749a9ed96389abeae1226c32a034

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