Malicious PDF — malware analysis report

Static analysis result for SHA-256 6511ad6b4fc84e65…

MALICIOUS

PDF

34.8 KB Created: 2020-09-02 11:52:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7500665f0bb27ccc317492fa67b061d SHA-1: c6cfc594f870e706e731560dd129e86b17289e09 SHA-256: 6511ad6b4fc84e65ac3674e858e74fd9587b122a35922e6770c6cff23632a8e7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a redirector service, which is a common tactic for distributing malware or phishing pages. The ML classifier strongly indicates maliciousness, and the presence of a link farm suggests an attempt to manipulate search engine results or distribute content broadly. The document body contains a URL that appears to be the primary lure.

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=video+editor+app++for+android+apk
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9550/7622/files/xelek.pdf
    • https://cdn.shopify.com/s/files/1/0431/9199/2484/files/ielts_writing_vocabulary_task_1.pdf
    • https://cdn.shopify.com/s/files/1/0434/1966/4540/files/avril_lavigne_rock_n_roll.pdf
    • https://cdn.shopify.com/s/files/1/0429/4865/7311/files/vodivuw.pdf
    • https://cdn.shopify.com/s/files/1/0437/6425/2826/files/baek_ji_young_ost.pdf
    • https://cdn.shopify.com/s/files/1/0432/3213/3278/files/8389002464.pdf
    • https://cdn.shopify.com/s/files/1/0463/2500/6497/files/france_schengen_visa_application_form_egypt.pdf
    • https://cdn.shopify.com/s/files/1/0437/9443/2161/files/postknight_gift_giving_guide.pdf
    • https://cdn.shopify.com/s/files/1/0439/1695/1704/files/vugenevixebilow.pdf
    • https://cdn.shopify.com/s/files/1/0434/0586/9213/files/58727053055.pdf
    • https://static.usrfiles.com/ugd/3c8574_2d5b9e85b0ea46b4972f97dd6dd19968.pdf
    • https://static.usrfiles.com/ugd/2ac701_89dd90873d43461bb2132c7b17a509de.pdf
    • https://static.usrfiles.com/ugd/b8c837_eb41f20180e6413098396a9da2b9956c.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/30408896218.pdf
    • https://cdn.shopify.com/s/files/1/0435/6230/3637/files/98298558878.pdf
    • https://cdn.shopify.com/s/files/1/0434/2589/0466/files/vemezobuduz.pdf
    • https://cdn.shopify.com/s/files/1/0431/6564/7002/files/exploratory_data_analysis_tukey.pdf
    • https://cdn.shopify.com/s/files/1/0438/0013/3793/files/40425963847.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004c9f.bin
8fb24c9cb34d12fe91b46ef5103835537630178612cb0ee359a429b4f16f873f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C9F 4856 bytes
font_01_sfnt_off00005d39.bin
cf502eff1b9544c6c1f0587fc0dcdaf76b890c2f6e083adbcff098851c4fe51a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D39 9648 bytes

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