Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb544fc14993df21…

MALICIOUS

PDF

58.0 KB Created: 2020-08-31 23:31:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f6f528ac9dcd9ec47958eea6e38a48c SHA-1: 9c06fa9ab92e367ebf7257c85972f830dbb7324c SHA-256: eb544fc14993df2142ad6bc6c76c6164ea2ca88864f61237951edd1df7616a01
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including a critical link to a known malicious redirector at 'https://ttraff.ru/wix?keyword=epoca+arcaica+grecia+pdf'. The ML classifier also strongly flagged this PDF as malicious. The document body contains obfuscated text and embedded URLs, suggesting an attempt to disguise malicious content and redirect the user to a harmful site.

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=epoca+arcaica+grecia+pdf
    • https://cdn.shopify.com/s/files/1/0431/7344/5788/files/libaxinifexe.pdf
    • https://cdn.shopify.com/s/files/1/0432/7692/7141/files/78020584971.pdf
    • https://cdn.shopify.com/s/files/1/0430/7868/0730/files/wirog.pdf
    • https://cdn.shopify.com/s/files/1/0432/3259/2040/files/sinidovojomusemubozonur.pdf
    • https://cdn.shopify.com/s/files/1/0439/6918/3902/files/8693395682.pdf
    • https://cdn.shopify.com/s/files/1/0427/5005/0460/files/from_dark_to_light_belinda_davidson.pdf
    • https://cdn.shopify.com/s/files/1/0429/9446/6969/files/biblia_catolica_download.pdf
    • https://static.usrfiles.com/ugd/ea2f88_1a18ca8bed044e88a6163b2d3cc5c16f.pdf
    • https://static.usrfiles.com/ugd/b8c837_9b556fd772c44d8b82230052d94cc704.pdf
    • https://static.usrfiles.com/ugd/1f5cef_bdf15ae9ee1940bfb5d3f1ec92a5fa1a.pdf
    • https://static.usrfiles.com/ugd/b8c837_1a1696d41ac94ba9a488f2d11346b43b.pdf
    • https://static.usrfiles.com/ugd/b444d4_38acb3864968413fb88401030a727859.pdf
    • https://static.usrfiles.com/ugd/b8c837_29e7b3aade4a4eb8bb125d60c744419c.pdf
    • https://static.usrfiles.com/ugd/8b49c6_e38b371194f5422a94c76a017ea6cbc3.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000990d.bin
3674f80838ed8ceabdfcbcbbd94f33d0a3b6adee2c8af11618b5d8ea8ca4e9e4
pdf-font-stream PDF embedded font (sfnt) at offset 0x990D 4672 bytes
font_01_sfnt_off0000a8f7.bin
84fa50cd2d4b6abd64dfc36cc0bf69c51c06108a70181b34f0570d50b6b66cb6
pdf-font-stream PDF embedded font (sfnt) at offset 0xA8F7 11284 bytes
font_02_sfnt_off0000cd76.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD76 4324 bytes