Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4af56b70f355bd0…

MALICIOUS

PDF

44.0 KB Created: 2021-06-03 16:29:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 9e58a2c6c24091b1383f1a3596e67c81 SHA-1: d6473a2017e01bceda3c379e2033119bb6b660d4 SHA-256: d4af56b70f355bd0d55dae1f39c0ffdd0021de2d816423e220c3f9ad63a202d1
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to known malicious infrastructure, specifically advertising game hacks and free item generators. The primary lure URL is https://netcdn.online/app/406889139/coin-master-facebook-hack-game-hack, which is associated with a known malicious redirector. The document body, though partially corrupted, contains references to these lures and the authoring application, suggesting a deliberate attempt to trick users into visiting malicious sites.

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-facebook-hack-game-hack In PDF document text
    • https://www.andrology.co.uk/uploads/files/files/minecraft-free-install_GM479516143.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/how-to-get-minecraft-for-free-on-chromebook_GM479516143.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/free-pet-snacks-coin-master_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/is-minecraft-free-on-computer_GM479516143.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/10-robux_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/minecraft-116-apk-download_GM479516143.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/hacks-minecraft_GM479516143.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/spin-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/pokemon-go-free-ultra-balls_GM1094591345.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/cool-free-roblox-outfits_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/coin-master-hack-1021_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/coin-master-free-spins-link-may-2021_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/minecraft-diamond-finder-hack_GM479516143.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/daily-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/free-robux-com-no-verification_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/how-to-get-free-robux-codes_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/coin-master-34-4-hack-download_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/como-sacar-buen-puntaje-en-juego-coin-master-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
stream_004_off000051ac.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51AC 24740 bytes
SHA-256: b7cd6ea3384587fe43c47625015c7005f97bea12c113c9d3dc46ef54848f332e
font_01_sfnt_off00008a09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A09 18040 bytes
SHA-256: 061f1859a06f64f15b62312cec33f4d1ae20d2ec323f296e754baff4e0335bc5

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