Malicious PDF — malware analysis report

Static analysis result for SHA-256 0190c084027892f9…

MALICIOUS

PDF

42.3 KB Created: 2020-08-09 04:49:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9640e9e1e2067cc64813024a78027e84 SHA-1: 05ebf250134e41555815c275f2cf4b1687d08963 SHA-256: 0190c084027892f97502dd281e8f923546edb9e096256e7b476a24bbf2d291a1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF document contains a mass of external links, many of which are disguised as book downloads. One prominent link, 'https://ttraff.ru/pify?keyword=data+analysis+book+pdf', is identified as a malicious redirector. This suggests the document's primary purpose is to lead users to malicious sites through a link farm, likely for further exploitation or phishing.

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=data+analysis+book+pdf
    • http://files.wicollaborative.org/uploads/1/3/1/4/131406510/4366142.pdf
    • http://files.wingsofhopemankato.com/uploads/1/3/1/8/131871642/67edb0e.pdf
    • http://files.remembering-the-past.com/uploads/1/3/1/4/131453465/bekaz-rilimu-pinanenutenofoz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/7471/4784/files/32542257482.pdf
    • https://cdn.shopify.com/s/files/1/0431/8488/1824/files/xamenoxolamu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/51025654711.pdf
    • https://cdn.shopify.com/s/files/1/0438/2310/4160/files/biraseguwogekerime.pdf
    • https://cdn.shopify.com/s/files/1/0438/8651/0232/files/2825468711.pdf
    • https://cdn.shopify.com/s/files/1/0440/8098/8325/files/60931199573.pdf
    • https://cdn.shopify.com/s/files/1/0434/3303/3877/files/gesibemogakaxab.pdf
    • https://cdn.shopify.com/s/files/1/0440/2734/7109/files/82083464338.pdf
    • https://cdn.shopify.com/s/files/1/0436/2004/0866/files/86890199303.pdf
    • https://cdn.shopify.com/s/files/1/0435/8995/9839/files/dokuvagaga.pdf
    • https://cdn.shopify.com/s/files/1/0437/9469/4304/files/74286970487.pdf
    • https://cdn.shopify.com/s/files/1/0437/2765/0970/files/accounting_rate_of_return_problems_and_solutions.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_off00006682.bin
5e954b1cacfff712259bb12084c8e52deab11cab00abdff956ce0e862eb4ffb2
pdf-font-stream PDF embedded font (sfnt) at offset 0x6682 5244 bytes
font_01_sfnt_off0000787d.bin
e9aeef48fcf192f84e395af415087baa0c1c0000a5256fb1fa842d5bef5ad7dd
pdf-font-stream PDF embedded font (sfnt) at offset 0x787D 10760 bytes