Malicious PDF — malware analysis report

Static analysis result for SHA-256 67c1352fcf5c6272…

MALICIOUS

PDF

49.8 KB Created: 2020-08-31 20:44:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 92c92bebbea6b489469cd282f48bb02d SHA-1: fe6c72d4bb29ef85414bf34b35a3bb56d36e0041 SHA-256: 67c1352fcf5c6272b6c13491b11cdcf23a2e44f78dddfb17502c61c2de6e37c8
154 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and contains a link to a known malicious redirector. The document body, though heavily obfuscated, contains the same malicious URL and a large number of other PDF links, indicating a link farm or redirection scheme. The presence of embedded URLs and the critical heuristic firings strongly suggest a malicious intent to redirect the user to harmful content.

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=contemplated+ti%25E1%25BA%25BFng+anh+l%25C3%25A0+g%25C3%25AC
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.opentle.org
    • https://static.usrfiles.com/ugd/837d34_f927bfced87343848d5b350e79fe0c18.pdf
    • https://static.usrfiles.com/ugd/4b874d_ff6addd9b03c4c3eae9e8818c3fdc366.pdf
    • https://static.usrfiles.com/ugd/b8c837_ed84d129d6d0410a94a5d885818b2d5d.pdf
    • https://static.usrfiles.com/ugd/b8c837_8049b98673904312b7b2d5c28064677c.pdf
    • https://static.usrfiles.com/ugd/d902bb_9e0035813565474188106a60cdca029a.pdf
    • https://static.usrfiles.com/ugd/b8c837_d5695c7ca42e48ada641c7d7f8905732.pdf
    • https://static.usrfiles.com/ugd/b8c837_eceaa00d0e2d4ebd8888d8e36a723509.pdf
    • https://static.usrfiles.com/ugd/b8c837_8681b949f3b543dfbc123353bc322985.pdf
    • https://static.usrfiles.com/ugd/7198c1_b7224fb61c2e4a98b62d6347c214ac11.pdf
    • https://static.usrfiles.com/ugd/4117a9_f0b0ce6b2c244d10b8b705613f1bbf40.pdf
    • https://static.usrfiles.com/ugd/b8c837_d81b9089030945d886ddd7c35c0b34d2.pdf
    • https://static.usrfiles.com/ugd/4f270c_e6ca7a3261b8410997e6d746a70fc97d.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_off0000625e.bin
0b4c336952257c8d068a5a77f51f773c4273e34cce80e485f373f96447544df5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x625E 5460 bytes
font_01_sfnt_off000073ea.bin
3da8738e09b65ad3cc1a8e9c1e0e234c470ecbc8a9412551e5c29c97f4317a66		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73EA 8916 bytes
font_02_sfnt_off00008ccc.bin
2880d9ef98872ac5b781d6b527badfadc3cc6dc92bc400fe92abc729a3316531		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CCC 17552 bytes

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