Malicious PDF — malware analysis report

Static analysis result for SHA-256 86a499f3c133ec32…

MALICIOUS

PDF

44.3 KB Created: 2020-08-25 16:25:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6765a5990bb4265369e204046d13e8f9 SHA-1: b461c1622d7367fbff31ea12ec4d00bd969e0225 SHA-256: 86a499f3c133ec32ed8b49a158f8954f7658c21940dbc408fc602aea510d9ed7
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with the primary one leading to a known malicious redirector. The document body, though heavily obfuscated, contains text related to website templates and the malicious URL, suggesting a lure to trick users into clicking the link. The presence of a large number of external PDF links also indicates a link farm, likely for SEO manipulation or to distribute further 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.ru/pify?keyword=best+free+website+templates+for+small+business
    • http://files.gh-ed.com/uploads/1/3/0/7/130776599/rajewiwabunit.pdf
    • http://sevemolo.kevinzollman.com/uploads/1/3/1/3/131379874/6935796.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/7818/8198/files/american_pastoral_philip_roth.pdf
    • https://cdn.shopify.com/s/files/1/0430/6858/8194/files/rubokebaborosaradoridux.pdf
    • https://cdn.shopify.com/s/files/1/0434/4545/2967/files/66535344529.pdf
    • https://cdn.shopify.com/s/files/1/0432/4678/0579/files/caffarelli_trumpet.pdf
    • https://cdn.shopify.com/s/files/1/0434/1268/4967/files/46504102908.pdf
    • https://cdn.shopify.com/s/files/1/0429/8778/2297/files/ending_sounds_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0429/9702/2879/files/avancemos_3_workbook_answers_pg_171.pdf
    • https://cdn.shopify.com/s/files/1/0466/7113/4885/files/11508246136.pdf
    • https://cdn.shopify.com/s/files/1/0435/7062/6723/files/boxetipajatugabikadot.pdf
    • https://cdn.shopify.com/s/files/1/0436/3714/5753/files/dudopotonuka.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_off00006f73.bin
97906d8262de2c68af866daff52f392a1605d6d297d3fc6b72ceb5ba06cf9672
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F73 5328 bytes
font_01_sfnt_off00008183.bin
1706ffb49d33d61ae05e8194a85342942b814babfed0925f000a7c869a81c109
pdf-font-stream PDF embedded font (sfnt) at offset 0x8183 10240 bytes