Malicious PDF — malware analysis report

Static analysis result for SHA-256 04181fd04c21c58c…

MALICIOUS

PDF

45.3 KB Created: 2020-10-09 03:02:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7438caf38aba280e28ff1a46078190e6 SHA-1: 3e63d5750e99a8e0e64c2ffdd8c0024a7176b15d SHA-256: 04181fd04c21c58ce281c60add76b8c03b0e39b440b1c49b061184424d5efca7
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 suspicious domains and are flagged as part of a link farm. One critical heuristic indicates a link to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily corrupted, contains a URL that matches one of the embedded links.

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://ggtraff.ru/strik?keyword=lista+cocktail+e+ingredienti+pdf In PDF document text
    • http://files.medinamoving.com/uploads/1/3/1/3/131380354/mabupiv-fifawurun-xetopenur.pdfIn PDF document text
    • http://files.melissa-schmidt.com/uploads/1/3/2/6/132681834/sifofodanu.pdfIn PDF document text
    • http://files.alfheimigs.com/uploads/1/3/2/6/132680901/4638162.pdfIn PDF document text
    • http://files.fieryservice.com/uploads/1/3/0/9/130969026/986741.pdfIn PDF document text
    • http://files.faithacademyfootball.com/uploads/1/3/2/7/132740253/aef11745b42cea.pdfIn PDF document text
    • http://kiwasub.tylersmith82.com/uploads/1/3/1/6/131607254/cff8853f352.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/3340/6871/files/get_in_the_van_book.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/7291/6118/files/biwixodigelixifutubog.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/8553/5648/files/cobol_cics_db2_tutorial.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/1274/9469/files/14654456009.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0609/1673/files/levels_of_explanation_definition_psychology.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/9026/6262/files/68252671801.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000067bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67BB 5328 bytes
SHA-256: 62bd831fc9aa59d658e9bee132ed7d98b420d125f6591e8416dbb2007211c164
font_01_sfnt_off000079ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79EF 14712 bytes
SHA-256: 98eabc4a7eb274683d33f954def082d4388b7891936277c5dcf2054625971807

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