Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ca2d0470f22d556…

MALICIOUS

PDF

39.5 KB Created: 2020-08-31 05:54:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 316195ee0745769aedb34eaf5b00b421 SHA-1: 69c1a39a5c4accf0acc27156f2b4cd5cc7143e6b SHA-256: 5ca2d0470f22d556b1d2f2588de31c763b0a96ba9bef4a26ec0c29d12e054a1b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which point to a known malicious redirector. The document body, though heavily obfuscated, contains text related to flight searches, suggesting a lure. The ML classifier strongly indicates maliciousness, and the presence of a malicious redirector URL is a high-confidence indicator of malicious intent.

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=cheap+flights+from+minneapolis+to+new+york
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_b03471109f874eecbcb614e3141d72b7.pdf
    • https://static.usrfiles.com/ugd/b8c837_27acffeacee14bc5bf94b30179a35dd5.pdf
    • https://static.usrfiles.com/ugd/4b7290_203ce7333efa49c7a4cdfed3d98d4ee1.pdf
    • https://static.usrfiles.com/ugd/b8c837_0855aecdad9f4b0aa0a1147d93c609aa.pdf
    • https://static.usrfiles.com/ugd/b8c837_97c468cfd3ee45e4b0c3034c15c84f8b.pdf
    • https://static.usrfiles.com/ugd/b8c837_e9b01d07d95c4b9e85287a58ed98cc9e.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/metiliwetizo.pdf
    • https://cdn.shopify.com/s/files/1/0439/3402/3848/files/bass_boost_equalizer_for_pc.pdf
    • https://cdn.shopify.com/s/files/1/0431/6315/6641/files/arabiyyah_bayna_yadayk_book_2.pdf
    • https://cdn.shopify.com/s/files/1/0432/4173/4311/files/73932828398.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_off00005ae1.bin
ca44652d9b579fe1b72158d0885c1a14d242c559b39befd93d8cc0f3848ff6f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AE1 5476 bytes
font_01_sfnt_off00006d7a.bin
6630d7eda22f05aeff0f64e4dcd05426b987f4fad71caebefd2f9b7db0492d51		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D7A 10476 bytes

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