Malicious PDF — malware analysis report

Static analysis result for SHA-256 836525f9e0237fc5…

MALICIOUS

PDF

71.7 KB Created: 2020-08-29 03:40:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6c2ca98392103c18ab12efc27536b51e SHA-1: 8cc80a6d6f9ce6fe4de61cb9d49575303a379336 SHA-256: 836525f9e0237fc5b3f51ef821b5fac7f541753a4f7f8c2d060382e9b7462f00
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=sqrt%2528+2%2529%255E+sqrt%2528+2%2529%255E+sqrt%2528+2%2529'. This URL is the primary indicator of malicious intent, suggesting the document is designed to lure users to a potentially harmful site. The presence of a large number of external PDF links also indicates a link farm, often used for SEO poisoning or distributing malicious content.

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=sqrt%2528+2%2529%255E+sqrt%2528+2%2529%255E+sqrt%2528+2%2529
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_6946d38991dd4992b14f681500e3a028.pdf
    • https://static.usrfiles.com/ugd/b8c837_1e5361aba60f4da0b59282e2a2787caf.pdf
    • https://static.usrfiles.com/ugd/b8c837_942c5375e538440f8284ddcaf11f1afd.pdf
    • https://static.usrfiles.com/ugd/b8c837_f1774ddf6d114eb98cce210ceae72023.pdf
    • https://static.usrfiles.com/ugd/b8c837_8a63269d233744f78dbcf25a874501d0.pdf
    • https://cdn.shopify.com/s/files/1/0438/0609/7570/files/tedofasenuwoladisuzofupit.pdf
    • https://cdn.shopify.com/s/files/1/0466/5216/2213/files/manuel_clio_2_phase_2.pdf
    • https://cdn.shopify.com/s/files/1/0431/6423/7988/files/partitioning_a_segment_worksheet_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0434/6596/5718/files/78044156954.pdf
    • https://static.usrfiles.com/ugd/b8c837_4d30eb72c1cd403f8d412663ef2052de.pdf
    • https://static.usrfiles.com/ugd/b8c837_5befc4d52e1247e49ff40fd82dcd01e4.pdf
    • https://static.usrfiles.com/ugd/b8c837_2cdd7914f6664c0fb4f3b3874868d185.pdf
    • https://cdn.shopify.com/s/files/1/0430/9378/6791/files/8244715030.pdf
    • https://cdn.shopify.com/s/files/1/0462/5639/0295/files/13156533197.pdf
    • https://cdn.shopify.com/s/files/1/0430/9562/1796/files/zaxasebemogerog.pdf
    • https://cdn.shopify.com/s/files/1/0437/5206/3125/files/vomatixi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b74f.bin
d03b58d17fad7b06613bb1a377a6419bc32ec09295b7d9f42891fcac7da603e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB74F 5000 bytes
font_01_sfnt_off0000c87b.bin
d1b15dec98118365f00c0d294d6db147a30f7153d2434fda7759e145fdfc50ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC87B 15560 bytes
font_02_sfnt_off0000fa83.bin
6bbfbb55f7a4de24f6f5d18c06cbe6b33c475af13fb4fe440099cc4bbed98450		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA83 16504 bytes

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