Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e5176ab0c6e6b8a…

MALICIOUS

PDF

43.6 KB Created: 2020-09-02 20:14:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e88c444a2383fe290e496e410e1a63a SHA-1: 4ec9335e5b4c19c213fa06dc2b30905079ec16bc SHA-256: 5e5176ab0c6e6b8a2f5df401e959718496e491b050e07cddb096f12a260b03d3
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, indicating an attempt to lead the user to a harmful site. The document body, though heavily obfuscated, contains text related to a 'dear father christmas letter template' and the malicious URL, suggesting a social engineering lure. The presence of numerous embedded links, many pointing to benign PDF files, suggests a link farm tactic to obscure the malicious redirect.

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.me/wix?keyword=dear+father+christmas+letter+template
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/6240f8_abd721c122c546b799fd8465079a834e.pdf
    • https://static.usrfiles.com/ugd/8c0e65_122bd35bef4947f4ac93a1a760a493c0.pdf
    • https://static.usrfiles.com/ugd/0d089b_c712e6e5c32b494fa0b2a4a36ede8e99.pdf
    • https://cdn.shopify.com/s/files/1/0462/3197/8138/files/ikea_meistervik_sheets.pdf
    • https://cdn.shopify.com/s/files/1/0434/5122/0134/files/free_ms_word_border_templates.pdf
    • https://cdn.shopify.com/s/files/1/0428/7243/8951/files/analysis_of_qualitative_data.pdf
    • https://static.usrfiles.com/ugd/b8c837_a789185b3a4b40c7b0d93217a8286e31.pdf
    • https://static.usrfiles.com/ugd/7182f3_e47215fdf4a846ac9e409ee1feba2820.pdf
    • https://static.usrfiles.com/ugd/0f5b72_751ef63a3528474b94e11d67529e21e4.pdf
    • https://cdn.shopify.com/s/files/1/0437/9816/7713/files/agnidevan_malayalam_movie_songs.pdf
    • https://cdn.shopify.com/s/files/1/0437/7794/9848/files/carmel_by_the_sea_map.pdf
    • https://cdn.shopify.com/s/files/1/0435/9569/4239/files/50436121395.pdf
    • https://cdn.shopify.com/s/files/1/0434/0016/7589/files/80084577853.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000567b.bin
71817914bb08193f6d937b8d0d965e77af6ccb9ca572f1561c42b0e6312957d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x567B 5252 bytes
font_01_sfnt_off0000683d.bin
8aa46541757940b9a8faece43212748f5b49556c863f412e29526adb6af73223		 pdf-font-stream PDF embedded font (sfnt) at offset 0x683D 10324 bytes
font_02_sfnt_off00008bb6.bin
531e37f64a2e7dc3bfb257675d9e6c644c7b1597f33ba9a969cd005a7ed65660		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BB6 16312 bytes

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