Malicious PDF — malware analysis report

Static analysis result for SHA-256 b124cc5662a4e316…

MALICIOUS

PDF

41.2 KB Created: 2020-09-12 08:07:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 046f1a5c29c325388bb4136383bfafe7 SHA-1: 135c92caac073859336c7d6fc2000f58e1f53880 SHA-256: b124cc5662a4e3160e3f5d0ab0d1263ee904876ea00d6ea932f7d1a3bad74288
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links, many of which point to external PDF files hosted on various domains. One critical heuristic indicates a link to known malicious redirector infrastructure, and another identifies a mass external PDF link farm, suggesting a SEO poisoning or link farm attack. The ML classifier also strongly flagged this PDF as malicious. The document body, though partially corrupted, contains the title 'Dodgers stadium food guide' and metadata indicating it was generated by wkhtmltopdf, likely as part of a campaign to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=dodgers+stadium+food+guide
    • http://files.rileystevens.org/uploads/1/3/0/7/130738850/025ce1.pdf
    • http://files.olivewavz.com/uploads/1/3/0/8/130873877/gixosupotuwi.pdf
    • http://files.susanrlawrence.com/uploads/1/3/2/6/132682925/6896654.pdf
    • http://files.teacherarium.org/uploads/1/3/0/8/130814127/vowuv.pdf
    • http://files.eahae.online/uploads/1/3/1/6/131636806/fepisaki.pdf
    • http://files.bhutaniowa.org/uploads/1/3/0/8/130873728/kolobovegu_sapomeperobol_tizetu_kidiwuve.pdf
    • http://files.gsacsnj.com/uploads/1/3/0/7/130738779/munurop.pdf
    • http://files.nancyjardineauthor.com/uploads/1/3/1/6/131637853/puratimatakubuvuta.pdf
    • http://dawigo.justinedaisuke.com/uploads/1/3/2/6/132695780/2b81ae5d.pdf
    • https://static.usrfiles.com/ugd/d01287_c5d829ec483e4221b47d8a527241e1d5.pdf
    • https://static.usrfiles.com/ugd/451a43_96641947a90642ac972fcfa6b0b8c7e6.pdf
    • https://cdn.shopify.com/s/files/1/0429/7749/3146/files/naparizedasolekadu.pdf
    • https://cdn.shopify.com/s/files/1/0434/5161/3351/files/android_10_one_ui_2._0_release.pdf
    • https://cdn.shopify.com/s/files/1/0430/1121/1425/files/jakuzifiwebekozexemubudok.pdf
    • https://cdn.shopify.com/s/files/1/0435/7311/7087/files/97228578359.pdf
    • https://cdn.shopify.com/s/files/1/0463/0845/8661/files/49232383260.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000632f.bin
c47f62e20d13d8ffd54b2b518f3f7ccc543bccdfd910691af979bdb400d92617
pdf-font-stream PDF embedded font (sfnt) at offset 0x632F 5192 bytes
font_01_sfnt_off000074cb.bin
b2d820f4a1de74afbbe2d4627e5f41b2872bbd4e13d3817bc94d107e2d1fc071
pdf-font-stream PDF embedded font (sfnt) at offset 0x74CB 10316 bytes