Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d341fb5d20afa1d…

MALICIOUS

PDF

48.4 KB Created: 2020-08-15 01:08:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 555066a998ea549fb383a66d41326a8c SHA-1: b04828824f686021dc13d233ef7ca2f46e6528f8 SHA-256: 5d341fb5d20afa1d75e82504d40225b8883b8c371b73091a39f99338aabb2563
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 external PDF files, suggesting a link farm for SEO manipulation or to host malicious content. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'https://ttraff.ru/pify?keyword=resume+templates+word+doc', which is likely used to obscure the final malicious destination. The ML classifier also strongly flagged this PDF as malicious.

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=resume+templates+word+doc
    • http://tegijisa.panthercreekptsa.org/uploads/1/3/0/7/130775734/abe49.pdf
    • http://sinon.lvpoutlet.com/uploads/1/3/1/6/131606552/8671634.pdf
    • http://manotoja.jimhockenhull.com/uploads/1/3/1/0/131070590/sedufa_buwamolonekipof_saxagawulit_tisatuse.pdf
    • http://files.meowlinda.ca/uploads/1/3/0/8/130813643/dorafaz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/6289/4498/files/bizujokazotu.pdf
    • https://cdn.shopify.com/s/files/1/0435/4077/5064/files/dezagaselutin.pdf
    • https://cdn.shopify.com/s/files/1/0431/0083/1905/files/gubipadirev.pdf
    • https://cdn.shopify.com/s/files/1/0429/7926/2615/files/zolowebofefipif.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jomanumono.pdf
    • https://cdn.shopify.com/s/files/1/0433/3066/6651/files/the_little_black_boy_william_blake.pdf
    • https://cdn.shopify.com/s/files/1/0435/0548/3942/files/wudep.pdf
    • https://cdn.shopify.com/s/files/1/0433/7496/8986/files/basic_electrical_engineering_file_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/8153/9489/files/39649238174.pdf
    • https://cdn.shopify.com/s/files/1/0436/4291/2926/files/map_of_south_african_provinces_and_towns.pdf
    • https://cdn.shopify.com/s/files/1/0429/7133/2767/files/15841636494.pdf
    • https://cdn.shopify.com/s/files/1/0435/7554/1919/files/lowes_west_st_paul.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_off00007285.bin
ea991450378aceb30d644bb09cad2c60ac41cbd4bd262e9300f831270629394d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7285 5048 bytes
font_01_sfnt_off000083c1.bin
d5e7918524d371652700d555d533b4264b73ae8a7501c14131ba3293c56a15d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83C1 10160 bytes
font_02_sfnt_off0000a66e.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA66E 4324 bytes

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