Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b8d69ab3dc06515…

MALICIOUS

PDF

50.6 KB Created: 2020-08-31 10:27:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c6b674915065392d32852dfeea74f26e SHA-1: 12db024819ccd2b56429d6ab51b81592adda226e SHA-256: 0b8d69ab3dc06515711d0172decb30d42944c456a4c143cbe2f3f2b993713e8d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a link farm designed to manipulate search engine results. One prominent URL, 'https://ttraff.com/wix?keyword=how+to+install+sliding+closet+door+bottom+guide+on+carpet', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains this URL and other links to PDF files, suggesting a tactic to drive traffic to malicious infrastructure.

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.com/wix?keyword=how+to+install+sliding+closet+door+bottom+guide+on+carpet
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.opentle.org
    • https://static.usrfiles.com/ugd/353d00_790bd720c4c24a9ebb03b9ad9590f954.pdf
    • https://static.usrfiles.com/ugd/91e123_de68f1dc2d684fc6acc31e8d9b68ed98.pdf
    • https://static.usrfiles.com/ugd/54fa57_380f7469098f4fab82d7d9f808f5d6ed.pdf
    • https://static.usrfiles.com/ugd/f0e51d_34b57bb6d13d419694bd9ee6f611936f.pdf
    • https://cdn.shopify.com/s/files/1/0430/9159/1321/files/wow_fight_club.pdf
    • https://static.usrfiles.com/ugd/f4de5e_2ff303d112244dc7a3637df7d9d1736b.pdf
    • https://static.usrfiles.com/ugd/469aea_01927e591e2248b6a3af7758637b957b.pdf
    • https://static.usrfiles.com/ugd/eb4c03_20ea44ba09ec4875bf04e2f40ac9444c.pdf
    • https://static.usrfiles.com/ugd/538d67_e7a5bb5981224158a2a39541595e3029.pdf
    • https://static.usrfiles.com/ugd/0df15e_9147b2fc4acd42d0bf99787b1ceb49c9.pdf
    • https://static.usrfiles.com/ugd/b8c837_90b894dfaf584e44b82e71d2bf24d862.pdf
    • https://static.usrfiles.com/ugd/07625c_39a28019323b4110823417198be17e1d.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
    • http://www.gnu.org/licenses/gpl.html

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000076a5.bin
b1f69dee0753ad033431e5429a6ad419bfdeb9d062e84eb66e919d490b9f59cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76A5 5584 bytes
font_01_sfnt_off00008985.bin
06107b40036eb44522f823784271e79533e1ff085286eeceb1724ba0c44e5511		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8985 6300 bytes
font_02_sfnt_off00009a0a.bin
8d8424a79575376b7ccec6681892e7569a758d5bb62a232fb2fa2a0f0753f632		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A0A 10148 bytes

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