Malicious PDF — malware analysis report

Static analysis result for SHA-256 617a42a711b4d940…

MALICIOUS

PDF

56.5 KB Created: 2020-08-29 18:45:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8c9abc2041b5a3feb48bac0853d24c7b SHA-1: f50fb7d1b7cc68c0897d0b896cf7f83b1ec9d0d4 SHA-256: 617a42a711b4d940903bad243796851b42f45c87052bff97c04d6c191d15c9e6
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the same URL. The PDF also includes a large number of links to other PDFs hosted on Shopify, suggesting a link farm for SEO manipulation, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier 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/wix?keyword=casio+fx+260+solar+calculator+negative+exponents
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/5247/4267/files/80964829054.pdf
    • https://cdn.shopify.com/s/files/1/0431/7482/2043/files/32223725330.pdf
    • https://cdn.shopify.com/s/files/1/0432/1447/1330/files/13166402864.pdf
    • https://cdn.shopify.com/s/files/1/0433/1575/7214/files/81168474340.pdf
    • https://cdn.shopify.com/s/files/1/0431/0397/7634/files/blin_yahoo_finance.pdf
    • https://cdn.shopify.com/s/files/1/0433/7300/2902/files/zavakub.pdf
    • https://cdn.shopify.com/s/files/1/0435/8494/6333/files/calendar_design_templates_vector.pdf
    • https://cdn.shopify.com/s/files/1/0462/8994/4737/files/apoorva_sagodharargal_movie_free.pdf
    • https://cdn.shopify.com/s/files/1/0428/6241/1935/files/jularaxonig.pdf
    • https://cdn.shopify.com/s/files/1/0435/3146/8951/files/80051209593.pdf
    • https://cdn.shopify.com/s/files/1/0431/7921/2959/files/68440234156.pdf
    • https://cdn.shopify.com/s/files/1/0428/9937/4233/files/78212341272.pdf
    • https://cdn.shopify.com/s/files/1/0431/5663/5812/files/righteous_font_free.pdf
    • https://cdn.shopify.com/s/files/1/0449/3993/5912/files/nivativi.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_off0000936e.bin
90ec943fdff3823d310979c7786d7ab53eff2e58827d5646e985f9a997da18fa
pdf-font-stream PDF embedded font (sfnt) at offset 0x936E 5644 bytes
font_01_sfnt_off0000a6b4.bin
d61816afb4c27a3ce25e856854b5b9f547cb674eeab1d655a202bd890f3c36dc
pdf-font-stream PDF embedded font (sfnt) at offset 0xA6B4 14908 bytes