Malicious PDF — malware analysis report

Static analysis result for SHA-256 aff3db339d3307fb…

MALICIOUS

PDF

34.6 KB Created: 2021-06-27 00:16:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: c8ccfba10d0689cb18b8bafd69187589 SHA-1: 9237ba805a4720a6545791b6a13b11fba751da7e SHA-256: aff3db339d3307fbcb3b954470492e7466b996f0b38f7e0ab0d5d0a6479c46d4
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on `metal.hr` and appear to be part of a link farm designed to attract users searching for game cheats and hacks. One critical heuristic identified a link to known malicious redirector infrastructure at `http://netcdn.co/app/431946152/official.robux.hack-updated-game-hack`. The presence of a visual download button lure further supports the malicious intent of directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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 http://netcdn.co/app/431946152/official.robux.hack-updated-game-hack In PDF document text
    • https://www.metal.hr/files/rich-free-roblox-accounts_GM431946152.pdfIn PDF document text
    • https://www.metal.hr/files/coin-master-free-spins-promo-code_GM406889139.pdfIn PDF document text
    • https://www.metal.hr/files/roblox-login-hack_GM431946152.pdfIn PDF document text
    • https://www.metal.hr/files/how-to-earn-robux-fast_GM431946152.pdfIn PDF document text
    • https://www.metal.hr/files/coin-master-free-cards-link_GM406889139.pdfIn PDF document text
    • https://www.metal.hr/files/how-to-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
    • https://www.metal.hr/files/hack-coin-master-without-human-verification_GM406889139.pdfIn PDF document text
    • https://www.metal.hr/files/roblox-fly-hack-no-virus_GM431946152.pdfIn PDF document text
    • https://www.metal.hr/files/is-roblox-free-on-ps4_GM431946152.pdfIn PDF document text
    • https://www.metal.hr/files/coin-master-hack-that-actually-works_GM406889139.pdfIn PDF document text
    • https://www.metal.hr/files/robux-match_GM431946152.pdfIn PDF document text
    • https://www.metal.hr/files/coin-master-hack-spins-free_GM406889139.pdfIn PDF document text
    • https://www.metal.hr/files/free-robux-no-survey_GM431946152.pdfIn PDF document text
    • https://www.metal.hr/files/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://www.metal.hr/files/free-tiktok-likes-and-followers_GM835599320.pdfIn PDF document text
    • https://www.metal.hr/files/how-do-you-get-free-tiktok-followers_GM835599320.pdfIn PDF document text
    • https://www.metal.hr/files/how-to-get-2021-robux-for-free_GM431946152.pdfIn PDF document text
    • https://www.metal.hr/files/proto-hack-for-roblox_GM431946152.pdfIn PDF document text
    • https://www.metal.hr/files/dll-inject-hacks-roblox_GM431946152.pdfIn PDF document text
    • https://www.metal.hr/files/bloxpage-free-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002da8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DA8 22764 bytes
SHA-256: 82e33469c2b0358072a8730f4c694d1a0f20b6cc89ed054c3984b61d9ae7fc8e
font_01_sfnt_off000060a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60A8 19600 bytes
SHA-256: 92d1839bfadfad275d56bde90275592db6bb6de3dfed621cf6c612b42e2f1c84

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