Malicious PDF — malware analysis report

Static analysis result for SHA-256 e61934fb83bf81b3…

MALICIOUS

PDF

45.4 KB Created: 2021-06-09 17:13:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: d689078e88012b796f717f4b931a9406 SHA-1: e00f503ff5487803c25d2e2a5dff2f1a4890a986 SHA-256: e61934fb83bf81b3dc8697352654f2180cf4104caca442b08b2894532941ed7f
160 Risk Score

Malware Insights

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

The PDF document contains a lure for a 'free generator / game hack' which redirects to malicious infrastructure. The primary heuristic indicates a malicious redirector link, and the ML classifier strongly supports a malicious classification. While no scripts were extracted, the embedded URL is the main vector for potential further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.tw/app/431946152/roblox-how-to-use-cheat-engine-2021-game-hack In PDF document text
    • http://sbm-nn.ru/images/coin-master-mod-apk-latest-hack-with-unlimited-free-spins_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/free-coin-master-links_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/minecraft-tower-defense-2-hacked_GM479516143.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-free-spin-whatsapp-group_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/how-to-get-free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/how-to-get-a-free-face-on-roblox-mac_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/roblox-com-free_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/free-roblox-card_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-free-coins-app_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/roblox-hack-how-to-get-evrything-free-on-catalog_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/how-to-get-free-robux-2021-easy_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-free-spin-link-twitter_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/how-to-play-minecraft-with-friends-for-free_GM479516143.pdfIn PDF document text
    • http://sbm-nn.ru/images/how-to-get-free-robux-app_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/how-to-free-robux_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/free-minecraft-alt-generator_GM479516143.pdfIn PDF document text
    • http://sbm-nn.ru/images/how-to-hack-a-roblox-chat_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/roblox-cheat-robux_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/minecraft-windows-free_GM479516143.pdfIn PDF document text
    • http://sbm-nn.ru/images/how-to-hack-roblox-accounts-2021-easy_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_off00004f5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4F5C 25552 bytes
SHA-256: 434cc817a17ad15d17498a7c58f466340f08fa22d822a1719d3b12fe3e4e221b
font_01_sfnt_off00008b1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B1E 19444 bytes
SHA-256: ada3881208204b52839bba702f1811a5a58d56a2636093ca968729aa5d501cf4

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