Malicious PDF — malware analysis report

Static analysis result for SHA-256 6593161b5008a405…

MALICIOUS

PDF

59.4 KB Created: 2020-08-31 18:51:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3ea1b30d0412faef93a588cf7ab2e028 SHA-1: 62333f55e317085a312baf5beef4ca0660981c98 SHA-256: 6593161b5008a40570cfa67bcf8d715eb70f0c519a5a314b5e6e24f15a9fc15e
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a critical redirector link pointing to malicious infrastructure. The document body, though heavily obfuscated, contains a URL that is also present in the link farm, suggesting a lure to a malicious site. The ML classifier strongly indicates maliciousness.

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.link/wix?keyword=consumer+reports+best+laptops+for+college+students
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/314c35_71847fbe8fe54fbfa7660fca8b74d43c.pdf
    • https://static.usrfiles.com/ugd/b11f6d_e10e6ec4c8344f12a930159a2b4a89a0.pdf
    • https://static.usrfiles.com/ugd/b8c837_9e88968d59744da3964ca22d0488171b.pdf
    • https://static.usrfiles.com/ugd/4d935e_7f12cca0cf4249369eae6fce655b380f.pdf
    • https://cdn.shopify.com/s/files/1/0461/3609/8969/files/93459433582.pdf
    • https://cdn.shopify.com/s/files/1/0430/8749/5321/files/how_to_play_psp_games_on_ps3.pdf
    • https://cdn.shopify.com/s/files/1/0434/2641/4749/files/xosisa.pdf
    • https://cdn.shopify.com/s/files/1/0465/5330/1142/files/chhello_divas_2_movie_full_hd.pdf
    • https://cdn.shopify.com/s/files/1/0432/4638/7362/files/xuwanilub.pdf
    • https://cdn.shopify.com/s/files/1/0435/1649/3976/files/40725357665.pdf
    • https://static.usrfiles.com/ugd/cb5dea_409669661a154dbb9f7770857e9eb99b.pdf
    • https://static.usrfiles.com/ugd/b8c837_99a92faeef5145e1ab0537b4a46ed1b1.pdf
    • https://static.usrfiles.com/ugd/60933b_06b320f51b4d4a6e847414d57a7456a8.pdf
    • https://static.usrfiles.com/ugd/912de2_62d80f61f0824ec2bd1e6deea1f3455a.pdf
    • https://static.usrfiles.com/ugd/0a0016_840ae6b116c244a1a936dd306e84c639.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009b66.bin
6029f50321cf471b3565c5fd476a159b421d989832cf0c70883e96eff2d4f4e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B66 5472 bytes
font_01_sfnt_off0000addd.bin
9512f986ac563d998da1441167e7c327109c0a8af4173fb2e2f64ed74c1e2697		 pdf-font-stream PDF embedded font (sfnt) at offset 0xADDD 10592 bytes
font_02_sfnt_off0000d209.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD209 4324 bytes

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