Malicious PDF — malware analysis report

Static analysis result for SHA-256 6279cf9bf04bf31e…

MALICIOUS

PDF

47.5 KB Created: 2020-08-30 11:08:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 339c5528689df0bfdaf187cb891a719a SHA-1: 0af30e4a4e7e1566dc20499db0cd2cc246dd5de9 SHA-256: 6279cf9bf04bf31e2e7482b8fc9a4bca9e12b8339ef3b7b0de47eb66d36532dd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a significant number of embedded links, many of which point to a link farm infrastructure designed to redirect users. The primary redirector URL is https://ttraff.cc/wix?keyword=ejercicios+numeros+enteros+y+racionales, which is flagged as malicious. This suggests the document's purpose is to lure users to malicious sites, likely for phishing or malware distribution, leveraging a link farm for SEO manipulation.

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=ejercicios+numeros+enteros+y+racionales
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/9212/3560/files/zowamikodesibizuz.pdf
    • https://cdn.shopify.com/s/files/1/0428/2816/9375/files/ase_student_certification_order_form.pdf
    • https://cdn.shopify.com/s/files/1/0440/7253/4166/files/tejagufefubawo.pdf
    • https://static.usrfiles.com/ugd/07625c_6bae7d810f234ea08e31210ff9b96dae.pdf
    • https://static.usrfiles.com/ugd/b8c837_e97d1b49d85246f88f14ebaee3a5159f.pdf
    • https://static.usrfiles.com/ugd/b8c837_828c7b6b1e374f26b03c6deba4942538.pdf
    • https://static.usrfiles.com/ugd/b8c837_11f23be4674c416ebfa7e960a66256f8.pdf
    • https://static.usrfiles.com/ugd/b8c837_a6560a86dbcf4117848d2f1d9867529d.pdf
    • https://static.usrfiles.com/ugd/b52961_d317cc78603e4c2cb38348bdd29abe23.pdf
    • https://static.usrfiles.com/ugd/d2751c_5d7f89415b374f259f4807a9c7fd34ce.pdf
    • https://static.usrfiles.com/ugd/764aaa_f62a01bdb69844afbdd790479e431613.pdf
    • https://static.usrfiles.com/ugd/0ebc1f_606e3a00d2404fd9b6ec19e1478ae26b.pdf
    • https://static.usrfiles.com/ugd/b8c837_934e2118687c44ffa2d7841d581f7731.pdf
    • https://cdn.shopify.com/s/files/1/0436/0614/7235/files/33712568345.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/suramagufumaxuragozud.pdf
    • https://cdn.shopify.com/s/files/1/0434/0950/6471/files/70339495062.pdf
    • https://cdn.shopify.com/s/files/1/0427/9166/5830/files/kosugusa.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_off00006bd3.bin
b163c1f9e048d4a39dd4526a5976b3e15d83bf7346531349659891ee75fa7be4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BD3 5080 bytes
font_01_sfnt_off00007d0c.bin
d74172e77fb08aff7ef269dbf8304547e719bcabf4a036f30fab7000346c3e3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D0C 16460 bytes

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