Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cef507c3e6762f3…

MALICIOUS

PDF

59.3 KB Created: 2020-08-31 00:06:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e4121c55c3d90de856f0df7d3f4de29 SHA-1: 48645a7bdc7bd2e3826237d67a8ad290b329179b SHA-256: 8cef507c3e6762f3180909d6a9bb1b8b4f1541639b6a1a115074d9c07086b444
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains embedded links, with one identified as a malicious redirector. The ML classifier strongly indicates maliciousness. The document body, though partially corrupted, contains text related to 'reservation' and includes the malicious URL, suggesting a lure to a phishing or scam page. The presence of numerous external PDF links also points to a link farm or redirection strategy.

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=el+empleado+busca+la+reservaci%2525C3%2525B3n
    • https://static.usrfiles.com/ugd/b8c837_af46178635b24690bcc99f6758291b71.pdf
    • https://static.usrfiles.com/ugd/8a419d_df85d792625e49d4a9c94cc82c6cbb05.pdf
    • https://static.usrfiles.com/ugd/b8c837_95c7f6ad57df4bddbf3a866824462b2a.pdf
    • https://static.usrfiles.com/ugd/191a6d_73e2cc1015a44f9a9f0c7132b2dedf67.pdf
    • https://static.usrfiles.com/ugd/0d002d_7c08afe88caf4888a881bfe61e55625a.pdf
    • https://static.usrfiles.com/ugd/b8c837_75c628a5be214b1691c4ee4cf0d159f7.pdf
    • https://static.usrfiles.com/ugd/455f95_a896237ab43149258e258fbb7eb4bda2.pdf
    • https://static.usrfiles.com/ugd/5af86b_262906bf27b646408b0cf82f5ff7ad99.pdf
    • https://static.usrfiles.com/ugd/b8c837_a79fbc4fff6349d8a55de628fba08f0e.pdf
    • https://static.usrfiles.com/ugd/b8c837_20de3a8b3a7c429c996668ffc80d8e8f.pdf
    • https://static.usrfiles.com/ugd/b8c837_aecdab9270964012a74f003896c4ad80.pdf
    • https://static.usrfiles.com/ugd/09273f_87d0aa0faa04419095fb5f2d04fa965d.pdf
    • https://cdn.shopify.com/s/files/1/0430/4296/3613/files/different_types_of_advertising_media.pdf
    • https://cdn.shopify.com/s/files/1/0431/8589/7627/files/dakaforubuziguroxavo.pdf
    • https://cdn.shopify.com/s/files/1/0429/6241/9863/files/letter_of_intent_for_graduate_school.pdf
    • https://cdn.shopify.com/s/files/1/0428/1496/3868/files/37530123780.pdf
    • https://cdn.shopify.com/s/files/1/0435/2638/9912/files/baldrige_criteria_for_performance_excellence.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_off0000a5c7.bin
69919c94ffbc2592cd1a37da9692c18b2a868c07673939084e8430f3c307ef7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA5C7 5544 bytes
font_01_sfnt_off0000b852.bin
8a70e6c12cfce196ae70dfdf86ba065054c773ec238acf0e501745886e6d354c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB852 11716 bytes

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