Malicious PDF — malware analysis report

Static analysis result for SHA-256 6521549756acf8ac…

MALICIOUS

PDF

34.4 KB Created: 2021-07-06 00:53:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: e505782c9a0b336134cba7f5447db716 SHA-1: 436d02c720972e0f286db35fe3e365f18b121a8e SHA-256: 6521549756acf8acbad5827f005cbb16164492660cfc79ba893bddf47b50d660
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically advertising free in-game items and hacks. The primary lure is related to Roblox and Minecraft, aiming to trick users into clicking through to potentially harmful sites. While no scripts were explicitly extracted, the embedded URLs and the nature of the lures strongly suggest a phishing or social engineering attack, likely initiated via a spearphishing attachment.

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.tw/app/431946152/best-free-roblox-outfits-game-hack In PDF document text
    • https://perpustakaan.pn-bengkalis.go.id/repository/free-roblox-robux-generator-2021-without-human-verification_GM431946152.pdfIn PDF document text
    • https://perpustakaan.pn-bengkalis.go.id/repository/free-robux-4all_GM431946152.pdfIn PDF document text
    • https://perpustakaan.pn-bengkalis.go.id/repository/free-roblox-gfx_GM431946152.pdfIn PDF document text
    • https://perpustakaan.pn-bengkalis.go.id/repository/free-roblox-jailbreak-private-server_GM431946152.pdfIn PDF document text
    • https://perpustakaan.pn-bengkalis.go.id/repository/free-robux-for-kids-no-verification_GM431946152.pdfIn PDF document text
    • https://perpustakaan.pn-bengkalis.go.id/repository/how-to-get-minecraft-windows-10-for-free-2021_GM479516143.pdfIn PDF document text
    • https://perpustakaan.pn-bengkalis.go.id/repository/free-minecraft-svg-cutting-files_GM479516143.pdfIn PDF document text
    • https://perpustakaan.pn-bengkalis.go.id/repository/bloxawards-com-earn-free-robux_GM431946152.pdfIn PDF document text
    • https://perpustakaan.pn-bengkalis.go.id/repository/mcmaster-club-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://perpustakaan.pn-bengkalis.go.id/repository/roblox-survey-for-robux_GM431946152.pdfIn PDF document text
    • https://perpustakaan.pn-bengkalis.go.id/repository/minecraft-pe-hacked-client-download_GM479516143.pdfIn PDF document text
    • https://perpustakaan.pn-bengkalis.go.id/repository/how-to-use-roblox-hacks-multiple-rbx-games_GM431946152.pdfIn PDF document text
    • https://perpustakaan.pn-bengkalis.go.id/repository/roblox-hack-generator-2021_GM431946152.pdfIn PDF document text
    • https://perpustakaan.pn-bengkalis.go.id/repository/my-boyfriend-cheated-on-me-with-his-ex-roblox_GM431946152.pdfIn PDF document text
    • https://perpustakaan.pn-bengkalis.go.id/repository/free-robux-generator-without-verification_GM431946152.pdfIn PDF document text
    • https://perpustakaan.pn-bengkalis.go.id/repository/hack-para-counter-blox-roblox-offensive-download_GM431946152.pdfIn PDF document text
    • https://perpustakaan.pn-bengkalis.go.id/repository/coin-master-free-coins-and-spins-daily-summary_GM406889139.pdfIn PDF document text
    • https://perpustakaan.pn-bengkalis.go.id/repository/how-to-hack-roblox-exploit_GM431946152.pdfIn PDF document text
    • https://perpustakaan.pn-bengkalis.go.id/repository/coin-master-free-spins-and-coins-link-today_GM406889139.pdfIn PDF document text
    • https://perpustakaan.pn-bengkalis.go.id/repository/coin-master-2021-free-spins_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_off00002fd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FD3 22428 bytes
SHA-256: 87dba02bb769a09020014149b20a376089ec951bbb214894355367716041dc39
font_01_sfnt_off000061aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61AA 19012 bytes
SHA-256: fd2be7b501cc1ddbfc061facd5d56eeae4294648e0a008f2ae7c9284085667e2

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