Malicious PDF — malware analysis report

Static analysis result for SHA-256 c10c41e4ac44dd05…

MALICIOUS

PDF

54.6 KB Created: 2020-08-30 15:06:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b75be67408e8a0ff3e43fd1a10a47c6 SHA-1: 47c53df0b8de935e3198fa912b1687e15c74407a SHA-256: c10c41e4ac44dd058d89764517b21e2e61e8dc4d9602302f28bbc98880a0c15c
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a known malicious redirector. The primary malicious URL identified is ttraff.ru, which is used to direct users to further malicious content. The document body itself is heavily obfuscated but contains references to the malicious URLs.

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/wix?keyword=a+democracia+na+am%25C3%25A9rica+tocqueville
    • https://cdn.shopify.com/s/files/1/0429/2149/2643/files/64363974388.pdf
    • https://cdn.shopify.com/s/files/1/0435/5099/8679/files/mezexufibimeminalafa.pdf
    • https://cdn.shopify.com/s/files/1/0439/9949/4302/files/93120632644.pdf
    • https://cdn.shopify.com/s/files/1/0437/0097/7829/files/model_joint_venture_agreement.pdf
    • https://cdn.shopify.com/s/files/1/0435/5905/9615/files/growth_and_decay_word_problems_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0439/0594/1672/files/kugawetewubosuvodewivuxa.pdf
    • https://cdn.shopify.com/s/files/1/0431/9959/4656/files/guxomanivipasipaxalox.pdf
    • https://cdn.shopify.com/s/files/1/0433/6877/5841/files/jetinoledojolinij.pdf
    • https://cdn.shopify.com/s/files/1/0438/5731/3957/files/free_active_directory_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0429/6232/1567/files/kunasudinaxonaxilifuvazi.pdf
    • https://cdn.shopify.com/s/files/1/0454/1464/5928/files/43862932803.pdf
    • https://cdn.shopify.com/s/files/1/0435/1403/6376/files/certification_letter_sample.pdf
    • https://cdn.shopify.com/s/files/1/0430/7196/3296/files/13435399377.pdf
    • https://cdn.shopify.com/s/files/1/0441/1791/7848/files/bernoulli_s_equation_application.pdf
    • https://static.usrfiles.com/ugd/5ed537_ef927674e7b7437397b28c14f84cd466.pdf
    • https://static.usrfiles.com/ugd/5cf23b_86510d504d4946de8e647bba2d3a2cf2.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007e61.bin
2b56662f85ca704b51e138b041b2d827aeb79d9c11981db047cfa49b46aa4fc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E61 5224 bytes
font_01_sfnt_off00008fc3.bin
f7c79c54e670d5cb6c7e27ea3222d481738555737223374dab04b204503324f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FC3 12620 bytes
font_02_sfnt_off0000b656.bin
26b31ba2131ae2f7da025a7fda5e9dcfe79fc1d25f6641dd8c13613e564b4b69		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB656 16100 bytes

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