Malicious PDF — malware analysis report

Static analysis result for SHA-256 f85b457335fd40ec…

MALICIOUS

PDF

34.1 KB Created: 2021-07-04 05:52:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 8af13bf7aa374a75acbbea8331da2993 SHA-1: 7462e1db1a01a5e629f99702faa0ee9b5ac88680 SHA-256: f85b457335fd40ecaa6383f4576126926122171ecf02d3f702adcbaa039c6a13
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains lures for game hacks and free spins, directing users to a known malicious redirector. The ML classifier also flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious sites, likely for further exploitation or malware delivery.

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/406889139/coin-master-links-free-spins-game-hack In PDF document text
    • https://luyenthitoanpro.com/public/upload/files/coin-master-hack-mod-apk-unlimited-spin-download_GM406889139.pdfIn PDF document text
    • https://luyenthitoanpro.com/public/upload/files/free-robux-rewards_GM431946152.pdfIn PDF document text
    • https://luyenthitoanpro.com/public/upload/files/case-clicker-2-hack-roblox_GM431946152.pdfIn PDF document text
    • https://luyenthitoanpro.com/public/upload/files/free-coins-and-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://luyenthitoanpro.com/public/upload/files/free-minecraft-addons_GM479516143.pdfIn PDF document text
    • https://luyenthitoanpro.com/public/upload/files/roblox-gift-card-uk-free_GM431946152.pdfIn PDF document text
    • https://luyenthitoanpro.com/public/upload/files/project-phoenix-roblox-hack-download_GM431946152.pdfIn PDF document text
    • https://luyenthitoanpro.com/public/upload/files/free-robux-cards_GM431946152.pdfIn PDF document text
    • https://luyenthitoanpro.com/public/upload/files/how-to-get-free-robux-com_GM431946152.pdfIn PDF document text
    • https://luyenthitoanpro.com/public/upload/files/roblox-ios-free-robux_GM431946152.pdfIn PDF document text
    • https://luyenthitoanpro.com/public/upload/files/coin-master-free-spins-11-01-2021_GM406889139.pdfIn PDF document text
    • https://luyenthitoanpro.com/public/upload/files/free-spins-coin-master-app-iphone_GM406889139.pdfIn PDF document text
    • https://luyenthitoanpro.com/public/upload/files/how-to-get-free-outrageous-builders-club-on-roblox_GM431946152.pdfIn PDF document text
    • https://luyenthitoanpro.com/public/upload/files/b-tool-hack-in-roblox-link_GM431946152.pdfIn PDF document text
    • https://luyenthitoanpro.com/public/upload/files/free-coin-master-cards_GM406889139.pdfIn PDF document text
    • https://luyenthitoanpro.com/public/upload/files/roblox-rocitizen-money-hack-glitch-daily-bonus-patched_GM431946152.pdfIn PDF document text
    • https://luyenthitoanpro.com/public/upload/files/roblox-mobile-cheat-codes_GM431946152.pdfIn PDF document text
    • https://luyenthitoanpro.com/public/upload/files/how-do-get-free-rocket-fuel-in-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • https://luyenthitoanpro.com/public/upload/files/how-to-get-free-coins-on-tiktok_GM835599320.pdfIn PDF document text
    • https://luyenthitoanpro.com/public/upload/files/hacks-for-roblox-high-school-2_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_off00003291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3291 21704 bytes
SHA-256: bcd4efd110a48d2bb7b9bde4805587172e70d86d9062521b2b016010d194d79a
font_01_sfnt_off0000623c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x623C 18344 bytes
SHA-256: 6ad1108e81c5525844192ddb13ab38111abd218b87fc7994796a13e0178d8bfd

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