Malicious PDF — malware analysis report

Static analysis result for SHA-256 c34ea0543a1a86ac…

MALICIOUS

PDF

42.0 KB Created: 2020-08-30 22:19:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b19fa956f234540c0caf2c4c38b1687 SHA-1: 166d02c505d417758b7626e9701397a25bd06bae SHA-256: c34ea0543a1a86ac27a9cc35cd7f6108bd34cb1d9021a876926bb5a144871894
152 Risk Score

Malware Insights

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

The PDF file contains embedded links that point to a known malicious redirector. The document body, though heavily obfuscated, appears to be a lure for a word search puzzle, likely to entice users to click the malicious link. The ML classifier strongly indicated maliciousness, and the PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms the presence of a link 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.cc/wix?keyword=furniture+vocabulary+word+search+puzzle+pdf
    • https://static.usrfiles.com/ugd/b8c837_714e4135be8f4c96a179b8141231f395.pdf
    • https://static.usrfiles.com/ugd/a18aa6_91125ff871014f48934019766540e09d.pdf
    • https://static.usrfiles.com/ugd/b8c837_92285239dda64af3bd69be43a5aa0015.pdf
    • https://static.usrfiles.com/ugd/87d215_202b62d520c84046ba248a63e8a9395f.pdf
    • https://static.usrfiles.com/ugd/9c43ec_46b911ea97514a698a67a4ac14cf3683.pdf
    • https://static.usrfiles.com/ugd/122077_050597ab02b944238f6744cb08f67d20.pdf
    • https://static.usrfiles.com/ugd/a771bd_f2ad824a6476493a92e98d4268b08fce.pdf
    • https://cdn.shopify.com/s/files/1/0464/7229/8646/files/bagukixunujavatubujeledi.pdf
    • https://cdn.shopify.com/s/files/1/0432/7938/4731/files/gogumekofanunaxaposikuv.pdf
    • https://static.usrfiles.com/ugd/b8c837_b7ff14640d1e4521a3cc30bfe1034d25.pdf
    • https://static.usrfiles.com/ugd/d775a9_5fdb4bfdfab74040aed1d87680f9b0f7.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_off000064f1.bin
c212b838e69ea2837715af9a928bf38c4a418c53a4925eb601398445ca41c3f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64F1 5644 bytes
font_01_sfnt_off0000783c.bin
b0cc54762dfa0d18d3cbc71b251bc10108ebd88c6576ec95c075ccc677efa891		 pdf-font-stream PDF embedded font (sfnt) at offset 0x783C 10268 bytes

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