Malicious PDF — malware analysis report

Static analysis result for SHA-256 7393a9e16972c925…

MALICIOUS

PDF

45.1 KB Created: 2020-09-01 09:18:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1568de1003f7c47231df16333ddf7519 SHA-1: 53a094e9ffb3c8b28db61d419067f804adc62225 SHA-256: 7393a9e16972c925b10604f111758419161c5e2ae6df2d5bc028733908ea12a8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to a link farm designed to redirect users to other sites. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains URLs that are consistent with this link farm behavior.

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.club/pify?keyword=pouteria+caimito+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/5816/6949/files/wisezaz.pdf
    • https://cdn.shopify.com/s/files/1/0433/8614/2876/files/55939646817.pdf
    • https://cdn.shopify.com/s/files/1/0439/1639/4648/files/mabitepanilijakinovozu.pdf
    • https://cdn.shopify.com/s/files/1/0462/5625/9221/files/mobi_reader_app_for_android.pdf
    • https://cdn.shopify.com/s/files/1/0462/3043/8039/files/calendar_ortodox_septembrie_2018.pdf
    • https://static.usrfiles.com/ugd/963627_bfc721be32614abd87e759f6992bbee9.pdf
    • https://static.usrfiles.com/ugd/b8c837_95984a5f735046ce9fcdf2916bf839b3.pdf
    • https://static.usrfiles.com/ugd/f3ecbe_1589228ec2d84932ab4818e64e9ac27b.pdf
    • https://static.usrfiles.com/ugd/8a419d_b2ccd7995abd45ad8386d96dc47c2654.pdf
    • https://static.usrfiles.com/ugd/ace02d_33337aabf1434ee58f165b449d6b0dab.pdf
    • https://cdn.shopify.com/s/files/1/0438/4836/8288/files/14665193027.pdf
    • https://cdn.shopify.com/s/files/1/0434/4712/4130/files/unearthed_arcana_d_d_3._5.pdf
    • https://cdn.shopify.com/s/files/1/0441/1087/2728/files/rijexirutegolidesixo.pdf
    • https://cdn.shopify.com/s/files/1/0432/6975/0944/files/cuyahoga_county_dog_license.pdf
    • https://cdn.shopify.com/s/files/1/0434/6147/6504/files/tipadapefu.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_off0000715e.bin
ff54bc15ac80df7ef04305b68b65659bc8be6e2a4ddc9884370294b8e009d9a0
pdf-font-stream PDF embedded font (sfnt) at offset 0x715E 5092 bytes
font_01_sfnt_off0000829a.bin
072e3a3fe2ca1ccd55cad3514ebc6270f148947a198f8a8fd552881b66cb0670
pdf-font-stream PDF embedded font (sfnt) at offset 0x829A 11920 bytes