Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf81259f264028c1…

MALICIOUS

PDF

34.8 KB Created: 2021-06-26 20:40:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 4f7c9830ddb5677824bfe9a9dd1b8e1c SHA-1: f4ae33873dafbaa4e0a57c3cbbfa2795506a3edf SHA-256: bf81259f264028c10e965fbc132f82e1e6955c323f9429f1888de98a611fc683
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and sites offering game hacks and cheats, such as 'roblox-mega-fun-obby-cheats-game-hack'. The document body and embedded URLs strongly suggest a lure to download potentially unwanted or malicious software. No scripts were extracted, but the presence of malicious links and the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic indicate a high likelihood of further compromise.

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/roblox-mega-fun-obby-cheats-game-hack In PDF document text
    • https://mbbs.hr/files/free-daily-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/plugin-free-robux-download-pc_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/coin-master-free-coins-link-2021_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/free-free-robux_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/coin-master-app-hacks_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/free-promo-codes-for-robuxs_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/robux-apk_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/free-fighting-roblox-game_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/pubg-uc-free-hack_GM1330123889.pdfIn PDF document text
    • https://mbbs.hr/files/how-can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/im-hack-you-roblox-id_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/hire-someone-to-hack-a-roblox-account_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/pokemon-go-free-to-download_GM1094591345.pdfIn PDF document text
    • http://mbbs.hr/files/robloxhacks_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/minecraft-free-download-ios_GM479516143.pdfIn PDF document text
    • http://mbbs.hr/files/pastebin-roblox-free-catalog_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/minecraft-windows-10-hacked-client_GM479516143.pdfIn PDF document text
    • https://mbbs.hr/files/how-to-make-a-minecraft-client_GM479516143.pdfIn PDF document text
    • https://mbbs.hr/files/free-card-codes-roblox-2021-no-survey-no-download_GM431946152.pdfIn PDF document text
    • https://www.roblox.com/.IIn 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_off00003086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3086 22328 bytes
SHA-256: 597c0ec29dd738f2272526231fd02185eb53571f93eebd403a89347f33040b1c
font_01_sfnt_off00006217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6217 19436 bytes
SHA-256: 102ee987cccd18fd6a22d37a0b156d84535f30ef97e9c9e7c7a7005b205cc58b

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