Malicious PDF — malware analysis report

Static analysis result for SHA-256 23138a261420ba9e…

MALICIOUS

PDF

43.1 KB Created: 2020-08-08 00:03:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f99892cd8a606323c7646189d52a8d6 SHA-1: f5bdbdcffbc4404a615a224c10d26b15d58fcf5f SHA-256: 23138a261420ba9e7cb8ab92d083f62eed5d5d10b354c6d290c53ad02a1b3873
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains multiple embedded URLs, with one identified as a malicious redirector. The primary malicious URL is https://ttraff.com/pify?keyword=pierre+bourdieu+kitaplar%25C4%25B1+pdf, which is likely used to funnel users to a malicious site. The document body contains garbled text and references to 'wkhtmltopdf', suggesting it was generated programmatically for malicious purposes rather than being a legitimate document. The ML classifier strongly indicated maliciousness.

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.com/pify?keyword=pierre+bourdieu+kitaplar%25C4%25B1+pdf
    • http://files.bondosaka.com/uploads/1/3/1/0/131070604/16ad01da1f.pdf
    • http://files.purplelotusspiritualhealinginc.com/uploads/1/3/1/6/131606025/3808512.pdf
    • http://files.manasluandtsum.com/uploads/1/3/0/7/130739856/rugagulumowuduluba.pdf
    • https://cdn.shopify.com/s/files/1/0427/5296/6812/files/51886183104.pdf
    • https://cdn.shopify.com/s/files/1/0431/8094/9658/files/wakadizotowusel.pdf
    • https://cdn.shopify.com/s/files/1/0437/5497/9477/files/convert_file_to_word_2020_online_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/7713/1683/files/14855992687.pdf
    • https://cdn.shopify.com/s/files/1/0433/0985/8984/files/rurebida.pdf
    • https://cdn.shopify.com/s/files/1/0434/5063/0297/files/index_html_code.pdf
    • https://cdn.shopify.com/s/files/1/0433/9728/3992/files/xunelokizuzeve.pdf
    • https://cdn.shopify.com/s/files/1/0438/5413/5456/files/rarojovoka.pdf
    • https://cdn.shopify.com/s/files/1/0438/0606/4801/files/97349615470.pdf
    • https://cdn.shopify.com/s/files/1/0428/7237/3414/files/13283824450.pdf
    • https://cdn.shopify.com/s/files/1/0431/7108/6485/files/sinozeruvebo.pdf
    • https://cdn.shopify.com/s/files/1/0431/5601/3205/files/xofidekaguwomipoborifo.pdf
    • https://cdn.shopify.com/s/files/1/0432/1479/9012/files/34796043704.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000059bc.bin
59235d89a4c4eabd44068bf01430912c66ac1857111574662e582ddc851a86f6
pdf-font-stream PDF embedded font (sfnt) at offset 0x59BC 5092 bytes
font_01_sfnt_off00006b1b.bin
7a083420be03d050643433df6be4cbbda191d1f6b7ec01ad2d9fbf9f408f1364
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B1B 16880 bytes