Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c7ea6d57239e38f…

MALICIOUS

PDF

39.1 KB Created: 2020-08-25 10:41:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31743d0eff05130f5fe62a156d525d74 SHA-1: c38a73c7ea4cdad2ca5e3ef471f3b87e6c5c355f SHA-256: 5c7ea6d57239e38fc5ef7d727a6ceedca22dc37154dc759475fe963bca9e46ce
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, including one to a known malicious redirector, suggesting a link farm or phishing lure. The document body, though partially corrupted, contains text related to a 'health and safety audit report' and a URL that appears to be part of a redirection scheme. The ML classifier also strongly indicated maliciousness. The embedded URLs are likely intended to lead the user to malicious content or further stages of an attack.

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/pify?keyword=health+and+safety+audit+report+pdf
    • http://files.garretreich.com/uploads/1/3/0/7/130775759/maxoz.pdf
    • http://files.brittanypelias.com/uploads/1/3/0/8/130874082/povusufukumifo-pamoziki-jagitetigume-wufow.pdf
    • http://vewurifu.girlbeyou.com/uploads/1/3/0/7/130776647/wimamux.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/9568/7328/files/active_directory_server_2020_r2.pdf
    • https://cdn.shopify.com/s/files/1/0430/8982/1847/files/8859130157.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/42778697636.pdf
    • https://cdn.shopify.com/s/files/1/0436/9671/7992/files/2186094535.pdf
    • https://cdn.shopify.com/s/files/1/0433/9970/8821/files/12910148000.pdf
    • https://cdn.shopify.com/s/files/1/0437/3925/0853/files/91809534914.pdf
    • https://cdn.shopify.com/s/files/1/0437/8951/6962/files/sevetevuxeb.pdf
    • https://cdn.shopify.com/s/files/1/0434/3939/0872/files/comparison_between_dna_and_rna.pdf
    • https://cdn.shopify.com/s/files/1/0430/6966/9527/files/jerotogukakaviza.pdf
    • https://cdn.shopify.com/s/files/1/0428/8148/2919/files/99549249112.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ac5.bin
ed913008abcd7832c42a9e90df5a3ac142b6f05aeeae5937bc339fd1c7f8ae84
pdf-font-stream PDF embedded font (sfnt) at offset 0x5AC5 5192 bytes
font_01_sfnt_off00006c66.bin
d9c40994059655cefde7607344127eefa1ae005abbfe5fd585f16daef2f49536
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C66 10276 bytes