Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f20c1e38816b189…

MALICIOUS

PDF

42.8 KB Created: 2020-08-21 01:02:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dbbc0902988e0d1b92df318b243026a0 SHA-1: 2b379cee373eea8765a4e5317cc6de0bd6439b4c SHA-256: 5f20c1e38816b1893a83fe6a5b8103d199f07b156902405ba71de0b36cb7f2d8
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 pointing to Shopify domains, but one critical link directs to a known malicious redirector. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm suggests an attempt to manipulate search engine results or distribute malicious content. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

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=bigasoft+total+video
    • http://files.artworkbyhat.com/uploads/1/3/0/7/130776489/suretenazal.pdf
    • http://fupaxalu.travelinandersons.com/uploads/1/3/2/7/132710780/244237.pdf
    • http://files.blognourishedbynature.com/uploads/1/3/0/8/130813409/6a69189963a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/5942/0063/files/qasida_al_burda.pdf
    • https://cdn.shopify.com/s/files/1/0430/7383/1073/files/wishfin_cibil_report_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/8534/0580/files/55565553548.pdf
    • https://cdn.shopify.com/s/files/1/0432/2990/5058/files/besokakogerifaxesiveni.pdf
    • https://cdn.shopify.com/s/files/1/0432/0549/2904/files/dukunekezosatezaf.pdf
    • https://cdn.shopify.com/s/files/1/0432/8043/3302/files/97732570350.pdf
    • https://cdn.shopify.com/s/files/1/0430/7202/8823/files/sevevadidadap.pdf
    • https://cdn.shopify.com/s/files/1/0432/8964/1116/files/gexajifovufudebulakapowon.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_off0000608e.bin
ee74e99b5cd8c14b2399875e53e58bc25e2f19c93896605e9427852f7d3852f7
pdf-font-stream PDF embedded font (sfnt) at offset 0x608E 5088 bytes
font_01_sfnt_off000071f8.bin
6dc4e8a2f6d4363e3f42450a6665fdfedd2ab6a504f5acd0c8754486e035c129
pdf-font-stream PDF embedded font (sfnt) at offset 0x71F8 13864 bytes