Malicious PDF — malware analysis report

Static analysis result for SHA-256 49512ea1fc75c17c…

MALICIOUS

PDF

43.9 KB Created: 2020-08-30 15:33:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c969c10a83a8972baec24b1c8a1bd6b0 SHA-1: b092784d6d6d7f2ebe46421e892a788bfe64801b SHA-256: 49512ea1fc75c17c9168dc1cce764d613faf343aac2c8fe5601073c57810c688
152 Risk Score

Malware Insights

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

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 document body, though heavily obfuscated, contains the malicious URL and several benign-looking PDF links, suggesting a lure to a malicious site. The ML classifier strongly indicates maliciousness.

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.link/wix?keyword=la+camara+lucida+pdf
    • https://cdn.shopify.com/s/files/1/0434/4528/9127/files/insert_page_into.pdf
    • https://cdn.shopify.com/s/files/1/0432/6499/9590/files/fundamentals_of_engineering_economics_3rd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0437/8555/2030/files/xesitulekegobefafibevu.pdf
    • https://cdn.shopify.com/s/files/1/0431/5843/8039/files/converting_units_of_length_ks2_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0431/3320/6682/files/37150410469.pdf
    • https://static.usrfiles.com/ugd/b8c837_1074e07e95a047e0bbf8a828a259661f.pdf
    • https://static.usrfiles.com/ugd/b8c837_0a6e6c3af0e04fbc8a3a456fb6f199ea.pdf
    • https://static.usrfiles.com/ugd/9dda13_0c71578428b34595afbc409123ea4d85.pdf
    • https://static.usrfiles.com/ugd/51c472_a899bb3600c84e92a94263c70a6f420b.pdf
    • https://static.usrfiles.com/ugd/b8c837_bf36f6b73d654dffb9ad9e1c2509dd58.pdf
    • https://static.usrfiles.com/ugd/b8c837_9161b9f4451d49ada618ad8dbb1d1f57.pdf
    • https://static.usrfiles.com/ugd/b8c837_e1883669ff4c45148f125acd4cf4194b.pdf
    • https://static.usrfiles.com/ugd/ea78e0_148f5bc6c8ee45eb8ab75ec6754a841a.pdf
    • https://static.usrfiles.com/ugd/b8c837_4f13a905ecaf43fab28eb0a4a827fa9c.pdf
    • https://static.usrfiles.com/ugd/d54300_13e601a098504cc7884aaa09daad7f4d.pdf
    • https://static.usrfiles.com/ugd/3e9e83_11a86ebfc5734cb9b8ef6a34e056ab61.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_off00006aee.bin
b15df189f094f56781fd8ea7a787adf7127aff08a94252af95def447223a2192
pdf-font-stream PDF embedded font (sfnt) at offset 0x6AEE 5064 bytes
font_01_sfnt_off00007c11.bin
b4388cd0ffaf47a555c418ee14a811fe3d5ed2471c2a52238a4b3e1685d9a8da
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C11 11528 bytes