Malicious PDF — malware analysis report

Static analysis result for SHA-256 05fae79c71f84ddd…

MALICIOUS

PDF

78.6 KB Created: 2020-09-12 22:42:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c2e5570a81998e01f590dfc78c787f20 SHA-1: db0877256c03f8012bec20101245a5bc5d398d63 SHA-256: 05fae79c71f84ddd955a7e7173edf378d445d6fe733e09eff1d274bb10f891d0
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 infrastructure, suggesting an attempt to lead the user to a malicious site. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/wix?keyword=anglo+saxon+boats+facts', which is flagged as a malicious redirector. The PDF also hosts a large number of external PDF links, many of which are benign, but the primary malicious link is the most concerning.

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=anglo+saxon+boats+facts
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/cc03df_88ed3f9aea254b4eb93040777b727bd8.pdf
    • https://static.usrfiles.com/ugd/8ff694_22a925d02985479baac8014fad72c370.pdf
    • https://static.usrfiles.com/ugd/fb5067_567b19af6a0241e787219e153c02423b.pdf
    • https://static.usrfiles.com/ugd/fef806_5b39c741331f4bb3adf366f463de4e46.pdf
    • https://static.usrfiles.com/ugd/10e3af_054f1714ac814a10abf1ee3266010e1e.pdf
    • https://cdn.shopify.com/s/files/1/0437/6975/7850/files/likewuwodatonasiw.pdf
    • https://cdn.shopify.com/s/files/1/0439/2275/1643/files/30326965205.pdf
    • https://static.usrfiles.com/ugd/921909_c6802921f5ed464788b211e743b0b1f7.pdf
    • https://static.usrfiles.com/ugd/3aee12_86d2aaadb315463784ffd0d5b1b59c95.pdf
    • https://static.usrfiles.com/ugd/c79b1c_745829baa4814de0a5dddcd6265d6d71.pdf
    • https://static.usrfiles.com/ugd/f967ac_b3aa9b853fbe4011a8118c322fec3662.pdf
    • https://static.usrfiles.com/ugd/7c1f05_f2c56b6865264794a5ee9ae9d4a32aae.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_off0000f55c.bin
c85a44383a60efb7cfd6a78561f37b0d45401f01366544148bcadb733a9405f3
pdf-font-stream PDF embedded font (sfnt) at offset 0xF55C 5152 bytes
font_01_sfnt_off0001070a.bin
df5892b6c4bdfbe2d962e3176db264d04811ef6f7b7f1a4d044e8bf85d23cb57
pdf-font-stream PDF embedded font (sfnt) at offset 0x1070A 11008 bytes