Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a5350a93de6c91e…

MALICIOUS

PDF

43.6 KB Created: 2021-05-11 01:34:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 6236684edefefd7c13137d1bf77ed9d6 SHA-1: f48f4fb31f696e158d7301773ed67653da4595a4 SHA-256: 5a5350a93de6c91ec175d042fe98a6a2df67caef23da7c801e41c94f6f1f2a25
280 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple links designed to lure users into clicking on what appear to be game hack generators and free currency offers. These links redirect to known malicious infrastructure and a large number of other PDF files, suggesting a link farm for SEO poisoning. The document body and heuristics indicate a strong intent to trick users into visiting malicious sites, potentially for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 6

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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.xyz/app/406889139/coin-master-hack-apk-download-for-android-mobile-game-hack In PDF document text
    • http://www.copoint.co.uk/images/hack-coin-master-apk_GM406889139.pdfIn PDF document text
    • http://www.copoint.co.uk/images/coin-master-gold-cards-free-2021_GM406889139.pdfIn PDF document text
    • http://www.copoint.co.uk/images/ways-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.copoint.co.uk/images/coin-master-free-spins-and-coins-today-gift-reward_GM406889139.pdfIn PDF document text
    • http://www.copoint.co.uk/images/microsoft-roblox-rewards_GM431946152.pdfIn PDF document text
    • http://www.copoint.co.uk/images/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • http://www.copoint.co.uk/images/coin-master-32-mod-hack-unlimited_GM406889139.pdfIn PDF document text
    • http://www.copoint.co.uk/images/hackear-juego-coin-master-espaol_GM406889139.pdfIn PDF document text
    • http://www.copoint.co.uk/images/apps-to-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://www.copoint.co.uk/images/www-coin-master-hack-xyz_GM406889139.pdfIn PDF document text
    • http://www.copoint.co.uk/images/robux-cheat_GM431946152.pdfIn PDF document text
    • http://www.copoint.co.uk/images/coin-master-online-hack-generator_GM406889139.pdfIn PDF document text
    • http://www.copoint.co.uk/images/coin-master-hack-tool-india_GM406889139.pdfIn PDF document text
    • http://www.copoint.co.uk/images/free-coin_GM406889139.pdfIn PDF document text
    • http://www.copoint.co.uk/images/minecraft-hax-download-no-virus_GM479516143.pdfIn PDF document text
    • http://www.copoint.co.uk/images/como-hackear-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://www.copoint.co.uk/images/minecraft-xbox-360-free_GM479516143.pdfIn PDF document text
    • http://www.copoint.co.uk/images/minecraft-free-version-pc_GM479516143.pdfIn PDF document text
    • http://www.copoint.co.uk/images/coin-master-fan-page-free-spins_GM406889139.pdfIn PDF document text
    • http://www.copoint.co.uk/images/games-on-roblox-that-give-you-free-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_003_off000047c2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47C2 28248 bytes
SHA-256: 52a24cbbc58342260457b8c4df36a82ff14052361008b8721feda7a0f742d935
font_01_sfnt_off0000867a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x867A 18792 bytes
SHA-256: 9b8c4ac4c9b43c558f32175e9106326f8ee670f1239155596fca266ca3d28f0b

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