Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fcb12fc58d90bb8…

MALICIOUS

PDF

39.6 KB Created: 2020-08-29 22:43:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f44c4e8f88c7d38cb98ff03a0f329e06 SHA-1: 72d2f3a90ed9a8b0ecb81000f32101e9bf724f47 SHA-256: 9fcb12fc58d90bb893df8e1e256d3d69790d5615ca4337ace399123f8df9755a
152 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, ttraff.ru, which is disguised as a review for a 'honey browser extension'. This suggests a phishing or social engineering attack aimed at redirecting users to malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous embedded links, including the malicious one, supports this assessment.

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.ru/wix?keyword=honey+browser+extension+review
    • https://cdn.shopify.com/s/files/1/0433/9436/7644/files/barron_s_600_toeic_vocabulary.pdf
    • https://cdn.shopify.com/s/files/1/0432/2243/3953/files/add_watermark_to_adobe_reader_xi.pdf
    • https://cdn.shopify.com/s/files/1/0435/6908/6623/files/attestation_de_vente_d_un_terrain.pdf
    • https://cdn.shopify.com/s/files/1/0435/4146/3189/files/celebrity_definition.pdf
    • https://cdn.shopify.com/s/files/1/0436/8865/7051/files/pusidonezu.pdf
    • https://cdn.shopify.com/s/files/1/0431/5506/2938/files/buginijamalisebivuwanof.pdf
    • https://cdn.shopify.com/s/files/1/0430/2051/7537/files/fatal_peer_authentication_failed_for_user.pdf
    • https://cdn.shopify.com/s/files/1/0430/1121/1425/files/lavabuporuxe.pdf
    • https://cdn.shopify.com/s/files/1/0432/0549/2904/files/jalsha_movies_bollywood_2019.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_off00005eb3.bin
0b275ce85157cd397c9fea5eb4efb6ba53810b310a82ad1657049e12a94a2740		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EB3 4860 bytes
font_01_sfnt_off00006f69.bin
2b329eb0a51c19b590d6fc2ff278a03f05cecb731fedcf32bce6d65489a584e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F69 10120 bytes

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