Malicious PDF — malware analysis report

Static analysis result for SHA-256 4360a2e3e32ab7a5…

MALICIOUS

PDF

43.2 KB Created: 2021-06-03 16:26:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: caf9f72ce3ff9c94ac106fde6b808a07 SHA-1: e735dbdeb40a067aaa3a6c7804f27604061953eb SHA-256: 4360a2e3e32ab7a505d0ca9588a880e60a08e0b2b147f30b5edd156cf1ce1bf5
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains multiple heuristics indicating it is a malicious redirector, specifically targeting users with lures related to game hacks and free generators. The embedded URL, https://netcdn.online/app/406889139/coin-master-400-spin-link-hack-game-hack, is identified as a known malicious redirector. The document body, though heavily obfuscated, contains references to 'Coin Master 400 Spin Link Hack', reinforcing the lure. The presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or social engineering attack, likely intended to lead users to further malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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 https://netcdn.online/app/406889139/coin-master-400-spin-link-hack-game-hack In PDF document text
    • https://www.andrology.co.uk/uploads/files/files/easy-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/roblox-free-hair-girl_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/robux-com-free_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/free-robux-for-free_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/coin-master-how-to-get-free-pet-food_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/free-robux-quiz_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/how-to-make-robux_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/free-robux-group-payouts_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/free-spins-on-coin-master-link_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/how-to-get-free-robux-in-2021_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/free-robux-real_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/free-t-shirt-roblox_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/mobihack-net-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/coin-master-app-hacks_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/roblox-person_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/rbx-free_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/free-robux-com-real_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/no-robux_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_004_off00005010.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5010 24188 bytes
SHA-256: 48157bac186f641bb83315aae15be0bc930cb280b757131d040deb97959eb891
font_01_sfnt_off00008673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8673 18124 bytes
SHA-256: f443844b3e4d226f56355801d35c8acae0a49a75edfea7e370e3ea7678f4fd9d

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