Malicious PDF — malware analysis report

Static analysis result for SHA-256 ece55d0c9f35e7b4…

MALICIOUS

PDF

33.7 KB Created: 2021-06-29 08:20:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 04879aded7821281cf0728f1a3c53742 SHA-1: 080cb15a42925d1dc4881c7cfdfae81827d75f2d SHA-256: ece55d0c9f35e7b43aca8467261df70282a6d2294a57e4c0bf742c25f90b20f5
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links, including a critical one to a known malicious redirector, designed to lure users with promises of free in-game items and hacks. The document body and heuristics indicate a scamming or phishing attempt, likely to lead users to sites that host further malware or phishing pages. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • 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.
  • 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-robux-no-survays-game-hack In PDF document text
    • http://lib.vipklh.ru/repository/online-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-pet-in-roblox_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-free-spin-codes_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-to-get-free-tbc-in-roblox_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-groups-to-join-numbers-roblox_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-to-get-a-free-minecraft-account_GM479516143.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-do-you-hack-for-2021000-coins-on-flip-master_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-to-hack-into-ppls-account-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-free-coins-and-spins-link_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/get-free-builders-club-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/roblox-free-robux-hackers_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-links-for-today_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-card-hack-app_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/how-to-get-free-robux-by-playing-games_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/free-robux-generator_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/roblox-cheat-codes-mobile_GM431946152.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/minecraft-pocket-edition-free-download_GM479516143.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/coin-master-free-soins_GM406889139.pdfIn PDF document text
    • http://lib.vipklh.ru/repository/roblox-how-to-change-your-name-with-cheat-engine_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_off00002c39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C39 22496 bytes
SHA-256: b48048999cdd363c56701758ea422c564eeede45cb88b9af2490068cc1523c74
font_01_sfnt_off00005e85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E85 19012 bytes
SHA-256: b975cfdaab6e9aade381c787a0cc73537a0f951618a5ee3c4fe067d401c32568

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