Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9c424390f6d7f8c…

MALICIOUS

PDF

50.9 KB Created: 2020-08-26 11:15:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d3f79d11730cebc5d7e43f09218d6cab SHA-1: 5304eb8c85a3341a129fb33dd05bfcd6e1863594 SHA-256: b9c424390f6d7f8c1739b52c6418fd10a0cfb590b7960c111940f9e5c5096212
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link farm designed to appear as legitimate document downloads, but one of the primary links redirects to known malicious infrastructure. The ML classifier strongly indicated maliciousness. The document body contains the malicious URL, suggesting a lure to trick users into clicking it. The presence of numerous benign-looking Shopify links is likely a tactic to obscure the malicious redirector.

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/pify?keyword=oxford+dictionary+of+accounting+pdf+free
    • http://files.skydivetofino.ca/uploads/1/3/0/8/130814032/jesapirerus.pdf
    • https://cdn.shopify.com/s/files/1/0450/2500/1630/files/map_of_africa_download.pdf
    • https://cdn.shopify.com/s/files/1/0440/1466/5886/files/paralytic_ileus_radiology.pdf
    • https://cdn.shopify.com/s/files/1/0435/4169/2570/files/frankfort_ancient_egyptian_religion.pdf
    • https://cdn.shopify.com/s/files/1/0428/6434/5255/files/77948182915.pdf
    • https://cdn.shopify.com/s/files/1/0431/6325/4944/files/zilerewazowovuvagi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kevaziretojigadogikoranab.pdf
    • https://cdn.shopify.com/s/files/1/0429/7303/6697/files/python_multiprocessing_example.pdf
    • https://cdn.shopify.com/s/files/1/0434/7052/0470/files/48887826158.pdf
    • https://cdn.shopify.com/s/files/1/0433/7529/6670/files/adenovirus_infection.pdf
    • https://cdn.shopify.com/s/files/1/0433/8706/0378/files/contending_forces.pdf
    • https://cdn.shopify.com/s/files/1/0431/5355/5610/files/data_structures_and_algorithms_short_notes.pdf
    • https://cdn.shopify.com/s/files/1/0432/7587/8564/files/endnote_nature_scientific_reports.pdf
    • https://cdn.shopify.com/s/files/1/0433/8148/9813/files/32051685320.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000070f2.bin
26391cef6eb03c8759532ba98a2d2dcc43d783b9eab75526f3aa586e6523bc1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70F2 5308 bytes
font_01_sfnt_off00008323.bin
8727489e739bb438cc9234e1f918f91c42dd1b04ce14a5cdd947801c0cecdb6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8323 10628 bytes
font_02_sfnt_off0000a7a1.bin
8d45f5f417e74c11d54eaee7138901bb4b2498e40dea16ccf89f2c2707c13e35		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA7A1 16544 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.