Malicious PDF — malware analysis report

Static analysis result for SHA-256 75943d618f76eaf7…

MALICIOUS

PDF

38.5 KB Created: 2020-08-11 14:07:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e1ee341fa8d33e3adfd71665dc4c19fa SHA-1: 9885594554ef11be49599aeb572acbf28ec50822 SHA-256: 75943d618f76eaf79e4526123d6a03c0c407d7c29c8b59723115a0a367769dc0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many of which are designed to redirect to malicious content, as indicated by the PDF_SEO_LINK_FARM and PDF_MALICIOUS_REDIRECTOR_LINK heuristics. The primary malicious link identified is https://ttraff.cc/wb?keyword=nucleonic%20level%20transmitter%20pdf, which likely serves as a lure to a malicious site. The ML classifier also strongly flagged this PDF as malicious. The document body itself is heavily obfuscated and contains what appears to be a reference to the malicious URL.

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/wb?keyword=nucleonic%20level%20transmitter%20pdf
    • http://files.nysabaparent.org/uploads/1/3/1/3/131398129/92c55c.pdf
    • http://files.hcountrycare.com/uploads/1/3/0/7/130776861/simusere_sisemudutur_demuzirelubapa.pdf
    • http://files.roadhousegrillandbar.com/uploads/1/3/1/8/131856995/441713560235.pdf
    • http://files.mykitchenkitchen.com/uploads/1/3/0/8/130874305/1110248.pdf
    • http://duzamevo.stellazhang.org/uploads/1/3/1/1/131164250/varokorotebum-dusosapudifo-vitefobit.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/4666/6389/files/7690926437.pdf
    • https://cdn.shopify.com/s/files/1/0430/7235/6505/files/fundamentals_of_soil_chemistry.pdf
    • https://cdn.shopify.com/s/files/1/0430/7307/7409/files/8442151474.pdf
    • https://cdn.shopify.com/s/files/1/0433/5727/4270/files/51450363137.pdf
    • https://cdn.shopify.com/s/files/1/0427/7737/8972/files/wibuvixikobenul.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/3789128943.pdf
    • https://cdn.shopify.com/s/files/1/0431/9812/0096/files/9299149667.pdf
    • https://cdn.shopify.com/s/files/1/0429/1801/9235/files/ejercicios_para_abdominales_en_casa.pdf
    • https://cdn.shopify.com/s/files/1/0427/8360/4903/files/72189148442.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_off0000590b.bin
0bbf12dcd5f63871c9b0ef329ced3ed276afad2fb14126bf448ae21c43041236		 pdf-font-stream PDF embedded font (sfnt) at offset 0x590B 5332 bytes
font_01_sfnt_off00006b18.bin
0f4528011818f69a9b9ec64bb73c647b875a6c024c9fb9a8b06411ceb662ed67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B18 10072 bytes

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