Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a4a5c6fcee09d9e…

MALICIOUS

PDF

45.6 KB Created: 2020-09-05 02:21:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f501d1a45bdba5ea69fcd084e6938ce2 SHA-1: 040006bb6addc6d6ff7cd65de6f96ceb4ae2fbe0 SHA-256: 7a4a5c6fcee09d9e3d4f5484448fc897258a21e4e7240b1e2c478ac7fb771383
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm and a specific malicious redirector URL, disguised within what appears to be document content. The primary malicious URL, https://ttraff.link/wix?keyword=come+alive+piano+sheet+music+pdf, is designed to lure users into clicking by appearing as a search result for sheet music. This URL leads to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains references to this malicious URL and numerous other benign Shopify links, likely as part of a link farm to improve search engine ranking or obscure the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • 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.link/wix?keyword=come+alive+piano+sheet+music+pdf
    • https://cdn.shopify.com/s/files/1/0439/0669/5320/files/93233136822.pdf
    • https://cdn.shopify.com/s/files/1/0428/1935/4791/files/3d_printer_supported_file_format.pdf
    • https://cdn.shopify.com/s/files/1/0438/2759/3376/files/5361598605.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pizegavegip.pdf
    • https://cdn.shopify.com/s/files/1/0431/6443/4589/files/fomapirubonesizako.pdf
    • https://cdn.shopify.com/s/files/1/0436/9616/0923/files/14009200520.pdf
    • https://cdn.shopify.com/s/files/1/0437/4721/3464/files/novuvaw.pdf
    • https://cdn.shopify.com/s/files/1/0427/9602/3975/files/khachaturian_flute_concerto.pdf
    • https://cdn.shopify.com/s/files/1/0434/1317/6469/files/seven_wonders_of_the_modern_world.pdf
    • https://cdn.shopify.com/s/files/1/0433/6749/7880/files/69391134036.pdf
    • https://cdn.shopify.com/s/files/1/0434/8595/4198/files/wufojobanegokuraxomofix.pdf
    • https://cdn.shopify.com/s/files/1/0434/8837/9032/files/civilization_revolution_2_android_multiplayer.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dagezaluvonanapukinuwit.pdf
    • https://cdn.shopify.com/s/files/1/0431/5699/6247/files/nokape.pdf
    • https://cdn.shopify.com/s/files/1/0430/6921/0773/files/gugevesopemidopiwal.pdf
    • https://cdn.shopify.com/s/files/1/0431/7547/7414/files/banibizekudogafeboku.pdf
    • https://cdn.shopify.com/s/files/1/0435/6525/2769/files/maxime_bernier_ppc_platform.pdf
    • https://cdn.shopify.com/s/files/1/0433/9603/8812/files/56640856685.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005aaa.bin
4c9bcaa88ffa1944f9799d81b2ce04ce544dbaa27367b61f7e08473166a85578		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AAA 5264 bytes
font_01_sfnt_off00006c70.bin
e98e2915adf377fcaf52eea41f193fd371bb438ece4c74be5c2143a05555b7e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C70 15044 bytes
font_02_sfnt_off00009b43.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B43 4324 bytes

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