Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5f3fe14689c9986…

MALICIOUS

PDF

38.9 KB Created: 2020-08-29 18:31:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 29d4db15cf4deec2d635fc086dd302d7 SHA-1: 2e44924b6033d7a76200c8a1d96aab16ffbcb203 SHA-256: a5f3fe14689c9986cd2d089e4d8cab9d72f345589d5e64b95ae60e3534571b90
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link T1059.001 PowerShell

The PDF file contains a significant number of embedded links, identified as a link farm. One of these links, 'https://ttraff.cc/wix?keyword=11.s%25C4%25B1n%25C4%25B1f+palme+fizik+pdf', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but includes the malicious URL, suggesting a lure to a malicious site.

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/wix?keyword=11.s%25C4%25B1n%25C4%25B1f+palme+fizik+pdf
    • https://cdn.shopify.com/s/files/1/0431/1223/5174/files/jobizubovezi.pdf
    • https://cdn.shopify.com/s/files/1/0450/4230/3140/files/bipartite_graph_in_graph_theory.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/doxufuvezemog.pdf
    • https://static.usrfiles.com/ugd/b8c837_bc08f15142aa476e932659dbf9068f2d.pdf
    • https://static.usrfiles.com/ugd/a31856_d290d3f157ed4379ad7c889e0923a844.pdf
    • https://static.usrfiles.com/ugd/bae363_cd425f06e66f4a9394af48ebb109a8a8.pdf
    • https://static.usrfiles.com/ugd/ac72e0_abfa9560cf9b4be8bdbc3cbc4807150a.pdf
    • https://static.usrfiles.com/ugd/a382ee_d819d844347a4329bab43de93ed512cc.pdf
    • https://static.usrfiles.com/ugd/b8c837_a5e9458c90b34e73960410e25f210f61.pdf
    • https://static.usrfiles.com/ugd/b8c837_71eaf389f3d94dfd8354dcb8484d49b1.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_off00005818.bin
886ecbb5e53a90dbd802171366e7135c24e4911d4d2baafa3d2091b6392247f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5818 5224 bytes
font_01_sfnt_off000069dc.bin
6aa085258718496576b3301277f5e2280eda6da895db714fc0d4f0d0a9e44b16		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69DC 11544 bytes

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