Malicious PDF — malware analysis report

Static analysis result for SHA-256 0961d33ea143c3f7…

MALICIOUS

PDF

58.1 KB Created: 2020-08-08 12:52:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b87fd67e5d6b256ae2bb7cd9a85f210 SHA-1: 66bb2d3046f3ff51bb54bac186bdc113c1e6d4ca SHA-256: 0961d33ea143c3f76faab363feeb0e27c2d9b50312ff427b4428dbbcaad2ff09
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to a link farm infrastructure designed to redirect users. One prominent link, 'https://ttraff.cc/pify?keyword=assembly+language+projects+pdf', is identified as a malicious redirector. The ML classifier strongly indicated maliciousness, and the document body, though obfuscated, contains URLs that are part of this link farm.

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=assembly+language+projects+pdf
    • http://files.deliverydoula.com/uploads/1/3/1/4/131406258/neberobujupubal.pdf
    • http://files.armycadetsofamerica.com/uploads/1/3/1/6/131636745/98f6c90c.pdf
    • http://files.cls-asia.net/uploads/1/3/1/4/131454436/77f72560d5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/6622/8898/files/86593694788.pdf
    • https://cdn.shopify.com/s/files/1/0437/5799/4138/files/vuxabezinovi.pdf
    • https://cdn.shopify.com/s/files/1/0438/4020/9056/files/38405728650.pdf
    • https://cdn.shopify.com/s/files/1/0432/3622/9278/files/84869384063.pdf
    • https://cdn.shopify.com/s/files/1/0429/7133/2767/files/convert_to_word_text_ocr.pdf
    • https://cdn.shopify.com/s/files/1/0433/6805/4949/files/the_afterlife_gary_soto.pdf
    • https://cdn.shopify.com/s/files/1/0440/1581/2766/files/gastrulation_in_amphioxus.pdf
    • https://cdn.shopify.com/s/files/1/0429/9902/1717/files/laposabimi.pdf
    • https://cdn.shopify.com/s/files/1/0432/4930/3720/files/jilaxifosozaxo.pdf
    • https://cdn.shopify.com/s/files/1/0434/1088/2727/files/43746747156.pdf
    • https://cdn.shopify.com/s/files/1/0431/2442/4853/files/11623363696.pdf
    • https://cdn.shopify.com/s/files/1/0433/5117/9416/files/buzinamedogosuxumi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000897c.bin
16c6304c22530995495100927d05155189961e579a97484a383e9a42da6f07de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x897C 5780 bytes
font_01_sfnt_off00009d17.bin
157a80d2d50088e36b2a5e1071e60f2fe9e71d3118812aed6f9bb3bc0a03b7b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D17 1952 bytes
font_02_sfnt_off0000a678.bin
dc3a1d57006ae08148a812107f895aaab654da371141e7c717a83c343e028504		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA678 16568 bytes

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