Malicious PDF — malware analysis report

Static analysis result for SHA-256 f26c650eb2b2580a…

MALICIOUS

PDF

42.7 KB Created: 2020-08-30 13:01:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13bbbc4d88ead70090283e1d0f03ed3b SHA-1: bb23eda22c1b617739b663737a138c62a28be66b SHA-256: f26c650eb2b2580a1d65f9432f6ae78108f4f394016717a622a5fdaea40019d9
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body is heavily obfuscated but contains the primary malicious URL. The presence of numerous external PDF links suggests a link farm or a method to distribute further malicious content.

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=position+distance+displacement+works
    • https://cdn.shopify.com/s/files/1/0463/6318/1217/files/birobo.pdf
    • https://cdn.shopify.com/s/files/1/0452/3904/2205/files/chabahar_port_vs_gwadar_port.pdf
    • https://cdn.shopify.com/s/files/1/0431/5735/6710/files/pdf_math_minutes_5th_grade.pdf
    • https://cdn.shopify.com/s/files/1/0431/4189/0210/files/45046436272.pdf
    • https://static.usrfiles.com/ugd/b8c837_c8b5fbe519dd4d489f77557477427c74.pdf
    • https://static.usrfiles.com/ugd/a76634_eee1a1c61e464b4188ee8bd151058bfc.pdf
    • https://static.usrfiles.com/ugd/b8c837_d3a6f1539907466daa50fcc1cd3abe81.pdf
    • https://static.usrfiles.com/ugd/5899d5_0ff7e46ce73244558872540147f6e560.pdf
    • https://static.usrfiles.com/ugd/b8c837_949bcddcbd734bbcaf75a39819f57f67.pdf
    • https://static.usrfiles.com/ugd/b8c837_4ce7df141ee543ad95be663f69fcede8.pdf
    • https://static.usrfiles.com/ugd/cc03df_07803ccf528d43bfb397372c1b257765.pdf
    • https://static.usrfiles.com/ugd/b8c837_3d8f19c115ae440c85890e15b3f8a894.pdf
    • https://cdn.shopify.com/s/files/1/0437/1103/7589/files/85860348122.pdf
    • https://cdn.shopify.com/s/files/1/0433/8499/5991/files/28810346641.pdf
    • https://cdn.shopify.com/s/files/1/0431/5820/8672/files/biggest_city_in_alabama.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_off0000676e.bin
68c32124d608a7086e187e64cedeb653c49faecb6b5ab80e5e532d77e148e38a
pdf-font-stream PDF embedded font (sfnt) at offset 0x676E 5376 bytes
font_01_sfnt_off000079aa.bin
b69856b87836853f67e982e4bda3140b59ae5e46a1d8a99ddef65d7e65436b5b
pdf-font-stream PDF embedded font (sfnt) at offset 0x79AA 10656 bytes