Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f4500df1d5fb29e…

MALICIOUS

PDF

112.1 KB Created: 2020-08-19 00:26:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 65e989e3e5fd49e22a51c7f90af592e6 SHA-1: a7e331ae04d8783d3d688e9269f54cd42fefa5ad SHA-256: 6f4500df1d5fb29eaa6d0aaca1bfdce7e91416409488673dfcfb2069918c4f94
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a malicious redirector link pointing to 'ttraff.cc', which is flagged as malicious. The document body, though heavily obfuscated, contains a reference to 'Easy anti cheat csgo' and the malicious URL, suggesting a lure for users to download a payload. The presence of numerous external PDF links, many hosted on Shopify, indicates a link farm used for SEO poisoning or distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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.
  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://ttraff.cc/pify?keyword=easy+anti+cheat+csgo
    • http://files.mimetv.net/uploads/1/3/1/4/131408024/zujurato.pdf
    • http://files.givingsquared.com/uploads/1/3/1/6/131637218/kolib_gevubululivoj_gopugopu_pagedibaro.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/3890/0373/files/42942122703.pdf
    • https://cdn.shopify.com/s/files/1/0430/7386/3842/files/acoustic_analysis_of_speech.pdf
    • https://cdn.shopify.com/s/files/1/0432/2626/7816/files/siroxumavejemeto.pdf
    • https://cdn.shopify.com/s/files/1/0430/8543/0945/files/54229501656.pdf
    • https://cdn.shopify.com/s/files/1/0431/7118/4794/files/turusolape.pdf
    • https://cdn.shopify.com/s/files/1/0439/1947/4856/files/tobowamabusukizor.pdf
    • https://cdn.shopify.com/s/files/1/0431/0594/3701/files/gusajexudexetakemepesozuz.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015503.bin
57c52d0cf10a866eb3aed67bc742848b7e98a3aed56f2ddeafd4ee826a3566c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15503 4376 bytes
font_01_sfnt_off0001646e.bin
34ec63fe00672f9d766d868045f2587c8b0c8efa2528f26c3e63d64e9a0a1af6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1646E 4992 bytes
font_02_sfnt_off0001756e.bin
437f23ed0991c764abf87643d74bdccfc9434465eb15a9bcd44378fc5728914e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1756E 11868 bytes
font_03_sfnt_off00019d19.bin
8fe31ac2096c5e11ca20e474ac9d4b0e624cd7c6a3d6648e58269b78a2b36287		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19D19 16304 bytes

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