Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f9a29c852988fa1…

MALICIOUS

PDF

44.0 KB Created: 2021-06-03 16:34:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: f517f75d909dfe7c5814be67cacac848 SHA-1: b1c42e47f88e1fdec6fa18c5bfd943afe531b458 SHA-256: 2f9a29c852988fa14a216da4e157aed75810bd4f479a1a73694766ca60b5fb2a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'free generator' or 'game hack' lures. The primary malicious URL identified is https://netcdn.online/app/406889139/free-spins-on-coin-master-2021-ios-game-hack. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a redirection-based attack designed to trick users into visiting potentially harmful websites.

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/free-spins-on-coin-master-2021-ios-game-hack In PDF document text
    • https://www.andrology.co.uk/uploads/files/files/free-roblox-clothes-girl_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/coin-master-50-spin-link_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/how-to-get-daily-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/coin-master-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/www-robux-us_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/pokemon-go-free-box_GM1094591345.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/moonactive-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/free-robux-only-username-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/free-robux-that-actually-works-2021_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/pokemon-go-free_GM1094591345.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/coin-master-facebook_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/is-minecraft-java-edition-free_GM479516143.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/coin-master-hack-iosgods_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/how-to-make-a-group-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/free-account-roblox-with-robux_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/how-do-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/ways-to-get-robux_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/how-to-hack-a-minecraft-server-and-make-yourself-op_GM479516143.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/how-to-get-minecraft-for-free-on-iphone_GM479516143.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/how-to-get-minecraft-windows-10-for-free_GM479516143.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_off000050fd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50FD 25004 bytes
SHA-256: 238c3945f1b2a45fc017a961b96a36d2e7796d48ca2e872dc8a95c2039de7fdc
font_01_sfnt_off00008931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8931 18288 bytes
SHA-256: 9fe1374c2a5f04ab05412f91fd2327b7ecdc71e8abb7b76c0a33ea1eb285afe1

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