Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c04e2285068f219…

MALICIOUS

PDF

41.3 KB Created: 2020-08-30 09:23:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8a8b07923db2091de5309b5cddfbd8f SHA-1: db575d29686f0764517e4ca2bfdc7f7a33d42cbf SHA-256: 4c04e2285068f2191018b3deb889ab266a54703536d1cc397550df8b9003c94e
154 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, a technique often used in SEO spam or to redirect users to malicious sites. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.cc/wix?keyword=reinos+y+provincias+de+la+nueva+espa%25C3%25B1a'. The document body, though heavily garbled, contains the title 'Reinos y provincias de la nueva españa', suggesting a lure document. The ML classifier strongly flagged this PDF as malicious.

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/wix?keyword=reinos+y+provincias+de+la+nueva+espa%25C3%25B1a
    • https://static.usrfiles.com/ugd/b8c837_8314c533b0d54bb79beabd900d76cdd8.pdf
    • https://static.usrfiles.com/ugd/b8c837_b5f0528152ec48529546888611bbc9ce.pdf
    • https://static.usrfiles.com/ugd/ade4e6_6c2efc0c4e2e4bd597f39c059ff77686.pdf
    • https://static.usrfiles.com/ugd/b8c837_5534b1fd798b4bd2ab91d8ec39330eb0.pdf
    • https://static.usrfiles.com/ugd/b8c837_6b04013cab2f47e3a52409404ed29aea.pdf
    • https://static.usrfiles.com/ugd/0a593f_b48d15d6c97b48d6886055107e4b2d5c.pdf
    • https://static.usrfiles.com/ugd/b8c837_607fbfb1d5f645238b825f8f09e0339f.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32150460784.pdf
    • https://cdn.shopify.com/s/files/1/0431/8851/9080/files/27062085499.pdf
    • https://cdn.shopify.com/s/files/1/0431/3609/0267/files/20773999444.pdf
    • https://cdn.shopify.com/s/files/1/0434/4774/6716/files/format_of_formal_letter_cbse_class_12.pdf
    • https://cdn.shopify.com/s/files/1/0435/7593/5134/files/bivoju.pdf
    • https://cdn.shopify.com/s/files/1/0429/5042/6787/files/aarushi_talwar_judgement.pdf
    • https://cdn.shopify.com/s/files/1/0435/5417/7183/files/72135615907.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006052.bin
4e532cc5d1fe240cbb1d59c5408f1c0769551c3f0fd0ae279758ee0824902cdd
pdf-font-stream PDF embedded font (sfnt) at offset 0x6052 5448 bytes
font_01_sfnt_off000072ae.bin
cde3f950880ccd8fc3c70d36dcdd880b114d317a2beb37e0f498a7a6df7f1d1c
pdf-font-stream PDF embedded font (sfnt) at offset 0x72AE 10972 bytes