Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ef20c3a19eaf723…

MALICIOUS

PDF

40.8 KB Created: 2020-08-12 14:56:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0570dd9551fbb15b03a46617a8369e6b SHA-1: ea4ea125e3f569049e3706abdc84cacc3cd08c73 SHA-256: 6ef20c3a19eaf7233cd0b5b49b5768069b632240c59a0ca05a53c9ac51c6875f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains a large number of embedded links, with one specifically pointing to a known malicious redirector. The heuristic firings indicate it is part of a link farm, likely for SEO manipulation or to distribute further malicious content. The ML classifier strongly flagged this sample as malicious.

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/pify?keyword=%25C3%25A7eyiz+listesi+pdf
    • http://sigisij.moosalamooultra.com/uploads/1/3/0/8/130873951/89b8dac.pdf
    • http://files.myroamingspirit.me/uploads/1/3/0/7/130776483/gilezekejef-rusen.pdf
    • http://files.novelsf.com/uploads/1/3/1/4/131483550/mataxopawowojuvuba.pdf
    • http://siriro.learningforlittlepeoplepreschool.com/uploads/1/3/1/4/131453574/b364f504.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/5699/6247/files/64522709992.pdf
    • https://cdn.shopify.com/s/files/1/0434/6416/3490/files/73089610731.pdf
    • https://cdn.shopify.com/s/files/1/0435/2029/5064/files/xujojaxu.pdf
    • https://cdn.shopify.com/s/files/1/0431/2186/8960/files/d_d_3._5_sorcerer.pdf
    • https://cdn.shopify.com/s/files/1/0440/1948/2774/files/litumarefudevuwe.pdf
    • https://cdn.shopify.com/s/files/1/0432/0765/5579/files/70343416196.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/64255738852.pdf
    • https://cdn.shopify.com/s/files/1/0438/4797/5062/files/1975_ford_f100.pdf
    • https://cdn.shopify.com/s/files/1/0427/7361/0663/files/80550520965.pdf
    • https://cdn.shopify.com/s/files/1/0437/1464/2069/files/summary_of_apartheid_laws.pdf
    • https://cdn.shopify.com/s/files/1/0433/9063/2101/files/wordly_wise_3000_book_8_teacher_s_edition.pdf
    • https://cdn.shopify.com/s/files/1/0428/3426/4231/files/5525645443.pdf
    • https://cdn.shopify.com/s/files/1/0435/9471/1203/files/bovedutuxibawinurebogebi.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_off000060d8.bin
cef107c6ff61702fa83cda5fca82d1da1eeae78aef143caa650613055939ca8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60D8 4972 bytes
font_01_sfnt_off000071a4.bin
143ad80b06a3cb16d24fc9d650f767184aa3c39bc927fbd51accad555cd99e20		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71A4 11252 bytes

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