Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc5698fe3a96eab8…

MALICIOUS

PDF

43.3 KB Created: 2021-06-09 12:18:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 6f2c66650c3f523d53818ea5b334e176 SHA-1: 4a9befc74015572722f7e91183ec1a98a37a8930 SHA-256: dc5698fe3a96eab89c6d71ab7776e600229950d020cb84e44cde7e9b50ecacd4
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains numerous links to external websites, many of which are presented as 'game hacks' or 'free currency generators' for popular games like Roblox and PUBG. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of such links, suggesting a malicious intent to redirect users to potentially harmful sites. The ML classifier also flagged this PDF as malicious with high confidence. No scripts were extracted, but the document's structure and embedded links strongly suggest it's part of a phishing or malware distribution campaign.

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/free-roblox-card-id-game-hack PDF link annotation
    • http://ines.co.rs/images/pubg-uc-300_GM1330123889.pdfIn PDF document text
    • http://ines.co.rs/images/lastrick-com-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://ines.co.rs/images/how-do-you-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://ines.co.rs/images/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://ines.co.rs/images/free-robux-games_GM431946152.pdfIn PDF document text
    • http://ines.co.rs/images/coin-master-free-spins-link-blogspot-2021_GM406889139.pdfIn PDF document text
    • http://ines.co.rs/images/how-to-get-free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://ines.co.rs/images/como-hackear-coin-master-gratis_GM406889139.pdfIn PDF document text
    • http://ines.co.rs/images/daily-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://ines.co.rs/images/roblox-catalog-free_GM431946152.pdfIn PDF document text
    • http://ines.co.rs/images/minecraft-bedrock-free-download-pc_GM479516143.pdfIn PDF document text
    • http://ines.co.rs/images/minecraft-windows-10-edition-free_GM479516143.pdfIn PDF document text
    • http://ines.co.rs/images/how-to-get-robux-fast_GM431946152.pdfIn PDF document text
    • http://ines.co.rs/images/how-to-exploit-roblox_GM431946152.pdfIn PDF document text
    • http://ines.co.rs/images/how-to-get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://ines.co.rs/images/free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://ines.co.rs/images/roblox-promo-codes-2021-robux_GM431946152.pdfIn PDF document text
    • http://ines.co.rs/images/bux-free-robux_GM431946152.pdfIn PDF document text
    • http://ines.co.rs/images/free-tiktok-followers-instantly_GM835599320.pdfIn PDF document text
    • http://ines.co.rs/images/youtube-how-to-get-free-robux_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
stream_004_off00004e0c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E0C 24704 bytes
SHA-256: 3e54ca3ef32f37612ba2515f437ed503bd16b20968c3c0ff5e17f401feba9a42
font_01_sfnt_off0000863a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x863A 18348 bytes
SHA-256: a840d74090776d0ae237291ba15be7d4e18779e5d32b8312d973eefd156fd895

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