Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbda19c13ffeca7f…

MALICIOUS

PDF

42.0 KB Created: 2021-05-12 03:07:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 995671d3cbd6ea2d0a47bb481a0d1de6 SHA-1: 01832a4eb38e457f6b90719b0b94db58b6875bd5 SHA-256: bbda19c13ffeca7f35013c2d4d9273646dde54f713ac65acefa2527cfa889d57
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links designed to lure users to external websites, masquerading as generators for game currency or hacks. The primary link directs to a known malicious redirector, and the document body is heavily populated with SEO-optimized links pointing to other potentially malicious PDF files. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a phishing or scam campaign aimed at driving traffic to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://netcdn.xyz/app/406889139/coin-master-daily-free-spins-link-app-game-hack In PDF document text
    • https://www.ma-plast.hr/files/games-on-roblox-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://www.ma-plast.hr/files/how-to-get-free-robux-for-real_GM431946152.pdfIn PDF document text
    • https://www.ma-plast.hr/files/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • https://www.ma-plast.hr/files/coin-master-hack-2021-ios-download_GM406889139.pdfIn PDF document text
    • http://www.ma-plast.hr/files/how-to-get-minecraft-for-free-on-mobile_GM479516143.pdfIn PDF document text
    • http://www.ma-plast.hr/files/coin-master-hack-app-2021_GM406889139.pdfIn PDF document text
    • http://www.ma-plast.hr/files/daily-free-spin-coin-master-link_GM406889139.pdfIn PDF document text
    • https://www.ma-plast.hr/files/coin-master-free-spins-link-facebook-page_GM406889139.pdfIn PDF document text
    • https://www.ma-plast.hr/files/coin-master-daily-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://www.ma-plast.hr/files/coin-master-free-spins-2021-hack_GM406889139.pdfIn PDF document text
    • http://www.ma-plast.hr/files/free-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://www.ma-plast.hr/files/free-spin-coin-master-online_GM406889139.pdfIn PDF document text
    • http://www.ma-plast.hr/files/coin-master-free-spins-2021-blogspot_GM406889139.pdfIn PDF document text
    • http://www.ma-plast.hr/files/coin-master-free-rare-cards_GM406889139.pdfIn PDF document text
    • https://www.ma-plast.hr/files/coin-master-free-spins-no-survey_GM406889139.pdfIn PDF document text
    • https://www.ma-plast.hr/files/minecraft-marketplace-free_GM479516143.pdfIn PDF document text
    • http://www.ma-plast.hr/files/how-to-exploit-roblox_GM431946152.pdfIn PDF document text
    • https://www.ma-plast.hr/files/free-unlimited-coin-master-online-tool_GM406889139.pdfIn PDF document text
    • http://www.ma-plast.hr/files/how-to-get-free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • https://www.ma-plast.hr/files/gameoffice-net-hack-coin-master_GM406889139.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_off00004a02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4A02 24184 bytes
SHA-256: 114a56a8cf50f9b00136bbc42f9b885758dd456acc2a812055e108c55b8526e1
font_01_sfnt_off0000811f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x811F 18476 bytes
SHA-256: 8af254e049fcccc1442405a550d0e3ce0b782d3872c3c9d4c1baf9e82e1cff79

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