Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1f4c995904d6c57…

MALICIOUS

PDF

34.7 KB Created: 2021-06-25 21:13:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 6a515976cb8e5dd6932a18e70b55ba3a SHA-1: 421709542fa7e6ed267c985462c078518182c58d SHA-256: e1f4c995904d6c57040de5ebc44e69845b6a11814a5e6bff935193e210b5807e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to redirector infrastructure, masquerading as generators for in-game currency or hacks for popular games. The ML classifier strongly indicated maliciousness, and the presence of redirector links confirms a malicious intent to lead users to potentially harmful sites. No scripts were extracted, but the primary attack pattern is social engineering via deceptive links.

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/free-roblox-cards-july-2021-game-hack In PDF document text
    • http://slim.sisminkada.net/repository/hack-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/how-to-get-minecraft-for-free-on-ps4-2021_GM479516143.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/free-robux-generator-for-roblox-2021_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/how-to-get-stuff-for-free-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/how-to-hack-a-roblox-group_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/free-spins-coin-master-app-ios_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/inf-jump-hack-script-for-phone-roblox_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/robux-free-robux_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/are-there-any-coin-master-hacks-that-actually-work_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/free-spin-and-win-coin-master_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/free-spins-coin-master-blogspot_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/how-to-get-free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/how-to-get-free-roebucks_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/pastebin-for-free-robux_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/minecraft-noob-vs-pro-vs-hacker_GM479516143.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/how-to-get-free-roblox-money-cheat_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/how-to-get-a-refund-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/arcane-adventures-hack-roblox-levels_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/roblox-fly-hack_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_off00002f47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F47 22168 bytes
SHA-256: 485c35dee85a7fe753af652fcd8a4774e29f353d8fc865d283880d4ea8e82b6f
font_01_sfnt_off00006097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6097 19712 bytes
SHA-256: fd070b2409b1926e2e9d1f2135c2273b4797a1550e4b88bbd28ab71d3d3850c5