Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bda0cb6f56455c2…

MALICIOUS

PDF

46.0 KB Created: 2020-08-21 00:07:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9944d4c843c9f006f74ae0f45e75ac9 SHA-1: bf2d06791daebe128559499d6427c7bca8165dac SHA-256: 6bda0cb6f56455c21ccc40eae7a085c42fdc32aeb72c30dc939e06e31900c758
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a link farm designed to redirect users to other sites. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting an attempt to lead users to malicious content. The document body, though heavily obfuscated, contains references to URLs that are also present in the embedded 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=anexos+simples+nacional+2019+pdf
    • http://files.katyprairiepromenaders.com/uploads/1/3/1/4/131453198/gesezid_doxitepuxitatu_jegekeduti_xoxefuwepuzoro.pdf
    • http://siweb.carolmeadsart.com/uploads/1/3/1/4/131453960/40bac6d1884291b.pdf
    • http://burebafe.wildflowerenterprises.net/uploads/1/3/1/4/131453574/zumuluzatejer-bofawun-waxoti-junidome.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zekimopesafirizaxos.pdf
    • https://cdn.shopify.com/s/files/1/0430/1658/5379/files/73541759803.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jedajuzosefowi.pdf
    • https://cdn.shopify.com/s/files/1/0430/7448/6421/files/10881776167.pdf
    • https://cdn.shopify.com/s/files/1/0430/8166/2613/files/fuxogawinegavawifozifamov.pdf
    • https://cdn.shopify.com/s/files/1/0436/2996/9561/files/kefaforugenitigizoset.pdf
    • https://cdn.shopify.com/s/files/1/0441/3535/0424/files/43334423704.pdf
    • https://cdn.shopify.com/s/files/1/0434/7628/7645/files/ielts_writing_band_descriptors_task_2.pdf
    • https://cdn.shopify.com/s/files/1/0431/0751/6565/files/50840461300.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/38655606666.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_off000065be.bin
449b02a5d07c99c78704b913781f05475eed0e2af499bc00a258aab96fa9f4ac
pdf-font-stream PDF embedded font (sfnt) at offset 0x65BE 5744 bytes
font_01_sfnt_off00007937.bin
84ef1051a1c4336650702380988055690a25a034cbbe300d56db497f472f7927
pdf-font-stream PDF embedded font (sfnt) at offset 0x7937 16908 bytes