Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ecb83bdc286a4c4…

MALICIOUS

PDF

46.9 KB Created: 2020-08-31 16:48:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd62835b13257be765b0ec01b4211668 SHA-1: c4a398c0e77c239a2960f88bb8da5994d7005ac8 SHA-256: 4ecb83bdc286a4c45def63406742876946ad08c54fe47d06c6af59cb7e8b14f5
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/wix?keyword=dirt+bike+bed+sheets', which is likely part of a phishing or spam campaign. The ML classifier also strongly indicated 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.com/wix?keyword=dirt+bike+bed+sheets
    • https://static.usrfiles.com/ugd/7f46b5_80cb84882b4d4e0499a233010e83ede2.pdf
    • https://static.usrfiles.com/ugd/b8c837_cd173868710a4e3bac42fa46603aaa37.pdf
    • https://static.usrfiles.com/ugd/b8c837_dbf61614925c45b59beeea5a0c209236.pdf
    • https://static.usrfiles.com/ugd/b8c837_61bd09aa55164e8187b767f01e3b8b5b.pdf
    • https://static.usrfiles.com/ugd/271e65_bd4c6f3eac24497e8cd25d14065daf7c.pdf
    • https://static.usrfiles.com/ugd/66c878_70c9fdd52ac14512b3f07f67a68b11b0.pdf
    • https://static.usrfiles.com/ugd/b8c837_59741ccce1674485acd68ab77f7d4372.pdf
    • https://static.usrfiles.com/ugd/97aff7_07a02e1d1a6e4cd1b9e52e0245a259ca.pdf
    • https://static.usrfiles.com/ugd/4bb894_14d46ca0dbde4cf3974d7f332227341f.pdf
    • https://static.usrfiles.com/ugd/b8c837_7cda6eb667ad437ca740bd61b864e9b8.pdf
    • https://static.usrfiles.com/ugd/93971e_86749c79dbe84c9ba6ae4052b5356ea6.pdf
    • https://static.usrfiles.com/ugd/36f25b_6635a5b1bab9418e86d5309b3937a010.pdf
    • https://static.usrfiles.com/ugd/b8c837_c7603f3b730b4ec0a5627ef94f09ea5f.pdf
    • https://static.usrfiles.com/ugd/34ec99_423c6d5bc84d4982bf3b55c91b22c75e.pdf
    • https://cdn.shopify.com/s/files/1/0430/8090/8949/files/74265340352.pdf
    • https://cdn.shopify.com/s/files/1/0437/9744/6816/files/libros_ciencias_ambientales_uned.pdf
    • https://cdn.shopify.com/s/files/1/0428/6650/7942/files/apache_maven_for_jdk_1._6.pdf
    • https://cdn.shopify.com/s/files/1/0432/4674/7803/files/best_performing_managed_portfolios.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_off00007b7c.bin
d2cf6c90e35c14d98f67cd0e5a734e4de7459d0023a400051c2e12d2c219b524		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B7C 4876 bytes
font_01_sfnt_off00008c0b.bin
db88cc1cb88d441c85590cffc395919b0c368c0b07036b355daed7cc16668939		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C0B 10288 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.