Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb312e14339c1078…

MALICIOUS

PDF

42.0 KB Created: 2021-05-16 12:05:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 930588286006d2cc411130bff3dbea41 SHA-1: 534766c67d44016136181d5ade8e89a0393039c9 SHA-256: fb312e14339c1078355bba0a36d1c793a192fca69193dc5f7aa3f7f8402c3a6c
168 Risk Score

Malware Insights

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

The PDF contains embedded links and a call-to-action phrase, luring the user to click on a link that redirects to malicious infrastructure. The document body, though heavily obfuscated, contains references to game hacks and a URL that aligns with the malicious redirector heuristic. The presence of numerous PDF links suggests a link farm designed to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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/479516143/minecraft-hacks-1.15-2-game-hack In PDF document text
    • http://ghhs.com.my/images/coin-master-daily-free-spin-app_GM406889139.pdfIn PDF document text
    • http://ghhs.com.my/images/how-to-get-roebucks-in-roblox_GM431946152.pdfIn PDF document text
    • http://ghhs.com.my/images/free-spins-for-coin-master-app_GM406889139.pdfIn PDF document text
    • http://ghhs.com.my/images/free-robux-com-real_GM431946152.pdfIn PDF document text
    • http://ghhs.com.my/images/free-minecraft-com_GM479516143.pdfIn PDF document text
    • http://ghhs.com.my/images/coin-master-pc-game-free-download_GM406889139.pdfIn PDF document text
    • http://ghhs.com.my/images/haktuts-2021-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://ghhs.com.my/images/free-coin-master-hack-no-verification_GM406889139.pdfIn PDF document text
    • http://ghhs.com.my/images/best-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://ghhs.com.my/images/minecraft-java-free-download_GM479516143.pdfIn PDF document text
    • http://ghhs.com.my/images/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://ghhs.com.my/images/free-robux-no-verification-required_GM431946152.pdfIn PDF document text
    • http://ghhs.com.my/images/coin-master-free-spin-bonus_GM406889139.pdfIn PDF document text
    • http://ghhs.com.my/images/can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://ghhs.com.my/images/minecraft-hacker-mask_GM479516143.pdfIn PDF document text
    • http://ghhs.com.my/images/minecraft-jar-free_GM479516143.pdfIn PDF document text
    • http://ghhs.com.my/images/free-robux-master_GM431946152.pdfIn PDF document text
    • http://ghhs.com.my/images/how-to-get-roblox-premium-for-free-2021_GM431946152.pdfIn PDF document text
    • http://ghhs.com.my/images/coin-master-free-spins-coins_GM406889139.pdfIn PDF document text
    • http://ghhs.com.my/images/is-minecraft-free-on-xbox_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_003_off00004ad8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AD8 25012 bytes
SHA-256: 9512844201cf06db16917854bd25d725e6d0953d5430bb9d3dfc8f3d556d1ec0
font_01_sfnt_off00008262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8262 18168 bytes
SHA-256: 304447a64c9c9da34caed164523f062cdaeb71933cc5e9c334f07884a33f2f76

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