Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a7c258c30e1f236…

MALICIOUS

PDF

35.3 KB Created: 2020-09-08 07:48:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b680c90d580d3aaa4d95d4e3bba87be4 SHA-1: 8f08875a332e61a300ce1341f9ab60e8c22b0a70 SHA-256: 3a7c258c30e1f2365bc34a960ff7ea2b93c5a9ce3d44652d757d387bd8005490
150 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, identified as a link farm. One of these links, 'https://ttraff.club/pify?keyword=weathering+and+erosion+reading+comprehension+worksheets+pdf', points to a known malicious redirector. The document body appears to be obfuscated or corrupted, but the presence of numerous links to external PDFs strongly suggests a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.club/pify?keyword=weathering+and+erosion+reading+comprehension+worksheets+pdf
    • https://static.usrfiles.com/ugd/ddb60a_f05636da9dbf47db8e852f1f13290af0.pdf
    • https://static.usrfiles.com/ugd/5b5da7_ced37741fa3443c38cb9b40ff05dd18f.pdf
    • https://static.usrfiles.com/ugd/97368a_8a554aaaf7d447bdbe2fccea581120dd.pdf
    • https://static.usrfiles.com/ugd/89064d_fddc2cbafa394b85902c5465f6dd1db3.pdf
    • https://static.usrfiles.com/ugd/0af078_334726b230e74abe88614146a3d360db.pdf
    • https://static.usrfiles.com/ugd/0c4177_a67a550d23e64465a87d4b0ab0a4961a.pdf
    • https://static.usrfiles.com/ugd/9a242c_6ea96f157c7343549a7581f4171c03c4.pdf
    • https://static.usrfiles.com/ugd/368de4_a0e140efbd4649d8ac9098c9cb9a6f9f.pdf
    • https://static.usrfiles.com/ugd/4d6844_49f8c481e7b94836ad951ca9cc7d78b5.pdf
    • https://static.usrfiles.com/ugd/63022f_d86ff279f772411784a0ea759cda0085.pdf
    • https://static.usrfiles.com/ugd/07ef24_378a821d4238455bb49cd554e9775cab.pdf
    • https://static.usrfiles.com/ugd/38955b_87be5a404d0a43fc8cc808b6c7b0c8c4.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_off00004a09.bin
c91af2a6e6f02fbd6c87ff70237e76af66d46e23d7aadba244b990c30fa19d25		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A09 5708 bytes
font_01_sfnt_off00005d68.bin
4e88848033d6f77a07359b57d8f841a2cd487e08adeb5472e393240217060011		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D68 10196 bytes

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