Malicious PDF — malware analysis report

Static analysis result for SHA-256 15f666584c8b5a29…

MALICIOUS

PDF

44.6 KB Created: 2020-08-29 23:29:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a53c6aa328cfd9629a20809ead94fc12 SHA-1: a1fac957810e10f8f5b09b86e9f74f2ae3e7bcc4 SHA-256: 15f666584c8b5a298a58f50e5e0c3f05a947cfb98115b09fe7c949e2f562799f
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically 'https://ttraff.cc/wix?keyword=21+day+fix+chart+blank'. It also exhibits characteristics of a PDF link farm, with numerous external links, including 'https://static.usrfiles.com/ugd/87d215_47786cd9bdf94206a6f669e28b843956.pdf'. The document body, though heavily obfuscated, contains references to the malicious URL and other PDF links, suggesting an attempt to drive traffic to malicious sites.

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.cc/wix?keyword=21+day+fix+chart+blank
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/87d215_47786cd9bdf94206a6f669e28b843956.pdf
    • https://static.usrfiles.com/ugd/b8c837_ac906ab6db68407e91c2fe143e45bde9.pdf
    • https://static.usrfiles.com/ugd/ce0e6d_456ffff2bb7b496dae2f6bc27310a721.pdf
    • https://static.usrfiles.com/ugd/b8c837_efefcd1dc6be4d60a5485c2ced8d6de7.pdf
    • https://cdn.shopify.com/s/files/1/0431/6463/1195/files/mw3_mods_xbox360.pdf
    • https://cdn.shopify.com/s/files/1/0431/8072/0285/files/general_manager_cover_letter_template.pdf
    • https://cdn.shopify.com/s/files/1/0432/4163/5997/files/sivazizepap.pdf
    • https://cdn.shopify.com/s/files/1/0431/2023/0564/files/5435412375.pdf
    • https://cdn.shopify.com/s/files/1/0430/7825/4753/files/76471342675.pdf
    • https://cdn.shopify.com/s/files/1/0430/6790/0061/files/12375412001.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/38935964995.pdf
    • https://static.usrfiles.com/ugd/b8c837_b072c06d4a21493abc00cecbcca5bde9.pdf
    • https://static.usrfiles.com/ugd/e8506d_bdef2192a7ad4e5585bf8fc7800badb0.pdf
    • https://static.usrfiles.com/ugd/b8c837_05ccfb6f509347ac986093d5b86f1f3d.pdf
    • https://static.usrfiles.com/ugd/b8c837_b71178487f704287a6a27ae5abc15c90.pdf
    • https://static.usrfiles.com/ugd/b9801a_2cc01a9a148f494fabb37e4fdb1e58fc.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a06.bin
f9df2b4d195397346e6a31af5e2827ae80e766d3554836720b7e142cae509ecc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A06 5396 bytes
font_01_sfnt_off00007c59.bin
f39c4fccbaf0cbb7555058588ffb24fb593d2c96296e1a467533470a659439ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C59 12776 bytes

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