Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa09e10d8d974b7e…

MALICIOUS

PDF

43.5 KB Created: 2020-08-30 23:21:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc59bcc8c642fe9b99602e41c36232c3 SHA-1: 0c7dd6bbfa9893c13f74650960b591ec7e580898 SHA-256: aa09e10d8d974b7e529a7bf0a6bf7a7d66bb9db3a3d2bba93c73af279d284def
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, many of which point to a link farm hosted on static.usrfiles.com. One of these links, ttraff.cc, is identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'Subaru legacy manual transmission' and the malicious URL, suggesting a lure to a phishing or malware distribution site. 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.cc/wix?keyword=subaru+legacy+manual+transmission
    • https://static.usrfiles.com/ugd/856cea_ff55917e2c854ca49c7158203bfa0da1.pdf
    • https://static.usrfiles.com/ugd/b8c837_c05975b7ef7d48009a5b7e423293b265.pdf
    • https://static.usrfiles.com/ugd/32acb1_cf1c5de195e344c1b05edcb0207e96f6.pdf
    • https://static.usrfiles.com/ugd/cb4a18_3653b4a2d92f41a59fb59a799b4c1102.pdf
    • https://static.usrfiles.com/ugd/2e79a6_0b8ff3b51f3d452c858aa39015bfdcce.pdf
    • https://static.usrfiles.com/ugd/9cb927_5e2b7da64879420fbfc58cb82e89394f.pdf
    • https://static.usrfiles.com/ugd/b8c837_c6c43a1de9d949f5ad10a1b366588b14.pdf
    • https://static.usrfiles.com/ugd/b8c837_88492bafbfee4ccebaf47e4fe01bd625.pdf
    • https://static.usrfiles.com/ugd/1a89c8_6e312bf79ff341ac91cf94292662e773.pdf
    • https://static.usrfiles.com/ugd/8b2c09_cfdf030607c04b49b912c68d0511f321.pdf
    • https://static.usrfiles.com/ugd/429b25_024ae9e1f8e847a79484b38a60fadcf7.pdf
    • https://static.usrfiles.com/ugd/b8c837_92b238685ffe4f349a7145b17cc66dab.pdf
    • https://cdn.shopify.com/s/files/1/0430/0193/8079/files/thyristor_triggering_circuit.pdf
    • https://cdn.shopify.com/s/files/1/0429/7303/6697/files/38291473755.pdf
    • https://cdn.shopify.com/s/files/1/0435/7757/3539/files/xifulaf.pdf
    • https://cdn.shopify.com/s/files/1/0429/4583/9271/files/trustee_act_1893.pdf
    • https://cdn.shopify.com/s/files/1/0430/7045/5965/files/horarios_cp_porto_aveiro.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_off00006b74.bin
762a42311afaed61de04c7b1f9ede80f228672b431b7d0b1c41cd376176d8ada		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B74 5464 bytes
font_01_sfnt_off00007df5.bin
ec6da26ead12fc7fc9c4609b4645630e5b6c6d4e5a28bab16b2ab85aaf9861e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DF5 10160 bytes

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