Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbb6e7aad7ad9a80…

MALICIOUS

PDF

43.2 KB Created: 2021-06-14 01:55:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 7397f289e6f37d41d2a4f2642bef08f6 SHA-1: 351e45dee03d1f4e595ec61371d59769fb67288d SHA-256: dbb6e7aad7ad9a80a8ec28b5f31b8b92cb958ab40641e7fff660e0d54560b10c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to known malicious redirector infrastructure, specifically advertising a 'free Robux giveaway' and 'game hack'. The primary lure URL is http://netcdn.co/app/431946152/free-robux-giveaway-2021-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a social engineering attack aimed at driving traffic to potentially malicious sites. The ML classifier also flagged this document with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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-robux-giveaway-2021-game-hack In PDF document text
    • https://imssea.org/wp-content/uploads/fsqm-files/roblox-all-free-items-list_GM431946152.pdfIn PDF document text
    • https://imssea.org/wp-content/uploads/fsqm-files/roblox-free-robux-console_GM431946152.pdfIn PDF document text
    • https://imssea.org/wp-content/uploads/fsqm-files/free-game-called-roblox_GM431946152.pdfIn PDF document text
    • https://imssea.org/wp-content/uploads/fsqm-files/roblox-secret-form-hack_GM431946152.pdfIn PDF document text
    • https://imssea.org/wp-content/uploads/fsqm-files/minecraft-free-apk_GM479516143.pdfIn PDF document text
    • https://imssea.org/wp-content/uploads/fsqm-files/hacking-brotherss-roblox-account_GM431946152.pdfIn PDF document text
    • https://imssea.org/wp-content/uploads/fsqm-files/free-robux-no-survey_GM431946152.pdfIn PDF document text
    • https://imssea.org/wp-content/uploads/fsqm-files/roblox-free-templates-blank_GM431946152.pdfIn PDF document text
    • https://imssea.org/wp-content/uploads/fsqm-files/scirpt-hack-roblox-vh2_GM431946152.pdfIn PDF document text
    • https://imssea.org/wp-content/uploads/fsqm-files/hack-roblox-void_GM431946152.pdfIn PDF document text
    • https://imssea.org/wp-content/uploads/fsqm-files/how-to-hack-roblox-to-get-free-builders-club_GM431946152.pdfIn PDF document text
    • https://imssea.org/wp-content/uploads/fsqm-files/roblox-adopt-me-how-to-get-free-bucks_GM431946152.pdfIn PDF document text
    • https://imssea.org/wp-content/uploads/fsqm-files/roblox-hack-apk-android-2021_GM431946152.pdfIn PDF document text
    • https://imssea.org/wp-content/uploads/fsqm-files/20-robux-free_GM431946152.pdfIn PDF document text
    • https://imssea.org/wp-content/uploads/fsqm-files/hacks-para-arsenal-roblox-tampermonkey_GM431946152.pdfIn PDF document text
    • https://imssea.org/wp-content/uploads/fsqm-files/free-robux-scam_GM431946152.pdfIn PDF document text
    • https://imssea.org/wp-content/uploads/fsqm-files/easy-robux-hacks-2021_GM431946152.pdfIn PDF document text
    • https://imssea.org/wp-content/uploads/fsqm-files/yyoutube-robux-hacks-2021_GM431946152.pdfIn PDF document text
    • https://imssea.org/wp-content/uploads/fsqm-files/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • https://imssea.org/wp-content/uploads/fsqm-files/roblox-windows-10-edition-unpatched-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
stream_003_off000049c1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49C1 25456 bytes
SHA-256: 060ed59d544bf36fc9eefa89160cb1060e30cfba49e83071a4662a55b6ab47fc
font_01_sfnt_off00008389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8389 19220 bytes
SHA-256: f0eed382ae4a8dea7a23b477216a3e5d29cc8845c93b99f33466d27d820bb9f3

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